Harley Davidson 2008 Sportster Models. Electrical Diagnostics Manual - page 12
Diagnostic Tips: IAT Sensor
Table 4-21. IAT Sensor Table
Check the following conditions:
TEMP °C
RESISTANCE
VOLTAGE
TEMP °F
•
Poor connection: Inspect ECM and harness connector
-20
29121
4.9
-4
[78] for backed out terminals, improper mating, broken
locks, improperly formed or damaged terminals, poor ter-
-10
16599
4.8
14
minal- to-wire connection and damaged harness.
0
9750
4.6
32
•
Perform 4.8 WIGGLE TEST to locate intermittents: If
10
5970
4.3
50
connections and harness check out OK, use a DVOM to
20
3747
4.0
68
check the IAT sensor voltage reading while moving related
connectors and wiring harness. If the failure is induced,
25
3000
3.8
77
the IAT sensor voltage reading will change.
30
2417
3.6
86
•
Shifted sensor: Refer to Table 4-21. This table may be
40
1598
3.1
104
used to test the intake air temperature sensor at various
50
1080
2.6
122
temperature levels in order to evaluate the possibility of a
shifted
(out-of-calibration) sensor which may result in
60
746
2.2
140
driveability problems.
70
526
1.7
158
•
An intermittent may be caused by a poor connection,
80
377
1.4
176
rubbed through wire insulation or a wire broken inside the
90
275
1.1
194
insulation.
100
204
0.9
212
NOTE
Diagnostic Notes: IAT Sensor
All voltage and resistance values are approximate (20%).
Measure IAT sensor resistance between ECM terminal "7" and
Each reference number below correlates to a circled number
system ground (ECM terminal "26").
on the flow chart(s).
1. Connect BREAKOUT BOX (Part No. HD-43876) to EFI
wire harness only
(leave ECM disconnected). See
4.7 BREAKOUT BOX: EFI.
2. Use HARNESS CONNECTOR TEST KIT (Part No. HD-
41404-B), gray pin probes and patch cords.
3. Use HARNESS CONNECTOR TEST KIT (Part No. HD-
41404-B), gray socket probes and patch cords.
4. Replace TMAP sensor. See Service Manual.
2008 Sportster Diagnostics: Engine Management 4-65
em01206
TMAP
Sensor
[80A]
A B C D
[80B]
A B C D
BK/W
To TP sensor
R/W
To TP sensor
[145B]
3
14
5
11
[145A]
3
14
5
11
R/W
To Jiffy Stand Sensor
BK/W To ET and O2 sensors
To VSS
BK/R
[78A]
7
14
25
26
[78B]
7
14
25
26
ECM
Figure 4-37. TMAP Sensor Circuit
Table 4-22. Wire Harness Connectors
NO.
DESCRIPTION
TYPE
LOCATION
[78]
Electronic Control Module (ECM)
36-place Packard
Under seat
[80]
T
emperature Manifold Absolute Pressure (TMAP) sensor
4-place Packard
Top of manifold
[145]
Engine Harness
16-place Molex
Under seat
4-66 2008 Sportster Diagnostics: Engine Management
MAP Sensor (Part 1 of 2): DTC P0107, P0108
Connect Breakout Box. With ignition ON,
1
measure voltage between terminal “25”
and terminal “26” on Breakout Box.
With key ON, engine OFF, voltage must
be between 3.5 and 5.0 volts.
With key ON, engine running, voltage
must be between 1.5-3.0 volts at hot idle.
Does voltage fit specifications?
YES
NO
Perform 4.8 WIGGLE TEST
STOP
to check for intermittents.
Intermittents present?
Go to MAP Sensor: (Part 2 of 2)
DTC P0107, P0108.
YES
NO
To identify the source of intermittents,
Replace TMAP sensor. Clear diagnostic
start with box marked by Bold Asterisk
trouble codes (DTCs) and road test. Did
under MAP Sensor: DTC P0107, P0108
check engine lamp illuminate and set
(Part 2 of 2).
DTC P0107 or P0108?
Wiggle harness while watching DVOM.
YES
NO
Install original TMAP sensor.
System
Replace ECM (reprogram,
now OK.
relearn) and road test again
to verify.
At some point in the flow chart you may be instructed
to jump directly to a the box with the bold asterisk.
Disregard the asterisk (but not the
instruction box) if your normal progression
through the chart brings you to this location.
Clear DTCs using speedometer self diagnostics.
See 4.6 SPEEDOMETER SELF DIAGNOSTICS.
Confirm proper operation with no check engine
lamp.
fc01218_en
2008 Sportster Diagnostics: Engine Management 4-67
MAP Sensor (Part 2 of 2): DTC P0107, P0108
Continued from MAP Sensor (Part 1 of 2): DTC P0107,
P0108.
Check the 5 volt reference supply at the TMAP sensor
connector [80B]. With ignition ON, measure voltage
2
between terminal C (R/W) and terminal A (BK/W).
Voltage approximately 5.0 volts?
YES
NO.
NO.
Greater
Less
than 6V.
than 4.5V.
Connect Breakout Box to connector [78B]
leaving ECM disconnected. OPEN CHECK:
Locate short to 12
Connect Breakout Box to connector
Measure resistance between TMAP
2
volts on (R/W)
[78B] leaving ECM disconnected.
connector [80B] Terminal “D” and Breakout
wire in wire
Check continuity between TMAP
Box cavity “25”.
harness. Repair as
connector [80B] terminal “C” and
Resistance less than 1 ohm?
necessary.
2
Breakout Box terminal “14”. Then
measure continuity between
TMAP connector [80B] terminal “A”
and Breakout Box terminal “26”.
Resistance less than 1 ohm?
YES
NO
Locate and repair
SHORT CHECK: Measure
open on (V/W)
resistance between TMAP connector
wire.
2
YES
NO
terminal “D” and chassis ground.
Resistance greater than 1 megohm?
Check resistance
Repair
between TMAP
open wire.
connector [80B]
terminal “C” and
Breakout Box
YES
terminal “26”.
NO
Resistance greater
than 1 megohm?
Locate and repair
Replace TMAP sensor. See
grounded (V/W)
Service Manual.
wire.
YES
NO
Replace ECM.
Locate and repair
Reprogram and
short between
learn password.
(R/W) and (BK/W)
wires.
At some point in the flow chart you
may be instructed to jump directly
to a the box with the bold asterisk.
Disregard the asterisk (but not the
Clear DTCs using speedometer self diagnostics.
instruction box) if your normal progression
See 4.6 SPEEDOMETER SELF DIAGNOSTICS.
through the chart brings
Confirm proper operation with no check engine
you to this location.
lamp.
fc01219_en
4-68 2008 Sportster Diagnostics: Engine Management
IAT Sensor (Part 1 of 2): DTC P0112, P0113
Connect Breakout Box to connector [78B] leaving
ECM disconnected. With engine at room temperature
(60-90° F or 16-32° C), use a DVOM to measure
1
resistance across terminal “7” and “26” on Breakout
Box.If engine is warm, refer to Table 4-21.
Resistance between 2.0k ohms and 5.0k ohms at room
temperature?
YES
NO
Connect ECM to Breakout Box.
Perform 4.8 WIGGLE TEST to
check for intermittents.
STOP
Intermittents present?
Go to IAT Sensor: (Part 2 of 2)
DTC P0112, P0113 .
YES
NO
Disconnect TMAP sensor
While wiggling harness, perform
connector [80]. Turn ignition ON.
steps marked by BOLD
Using a DVOM, measure the
ASTERISKS under IAT Sensor
voltage between ECM terminal “7”
(Part 2 of 2): DTC P0112, P0113.
(positive) and terminal “26”
Repair as necessary.
(negative) on Breakout Box.
Voltage approximately 5 volts?
NO. Less than
YES
NO
4.7 volts.
Replace TMAP sensor, clear codes
With TMAP sensor disconnected,
Unplug ECM leaving Breakout Box
and road test.
disconnect ECM from Breakout Box.
connected at vehicle harness.
Did check engine lamp illuminate
Measure resistance between
Measure voltage between
1
1
and set DTC P0112 or P0113?
Breakout Box terminal “7” and terminal
Breakout Box terminal “7” and
“10” or “28”.
terminals “10” or “28”.
Resistance less than 1 megohm?
Voltage 0 volts?
YES
NO
YES
NO
YES
NO
Install original IAT
System
Repair short to
Replace ECM.
Replace ECM.
Examine IAT signal
ground on
Reprogram and
Reprogram and
sensor, replace ECM,
OK.
wire (LGN/Y) for
perform password
(LGN/Y) wire.
learn password.
learn password.
short to voltage and
learning and road test.
repair.
At some point in the flow chart you
may be instructed to jump directly
to a the box with the bold asterisk.
Disregard the asterisk (but not the
instruction box) if your normal progression
through the chart brings
Clear DTCs using speedometer self diagnostics. See 4.6
you to this location.
SPEEDOMETER SELF DIAGNOSTICS. Confirm proper
operation with no check engine lamp.
fc01220_en
2008 Sportster Diagnostics: Engine Management 4-69
IAT Sensor (Part 2 of 2): DTC P0112, P0113
Continued from
IAT Sensor: (Part 1 of 2) DTC P0112, P0113.
Disconnect TMAP sensor connector [80B] and
examine for damage.
Connector OK?
YES
NO
Using a DVOM, measure the resistance between TMAP sensor
Repair
connector [80B] Terminal B and ECM terminal “7” on Breakout Box.
connector.
2
Resistance less than 1.0 ohm?
YES
NO
Using a DVOM, measure the resistance between TMAP
sensor connector [80B] terminal “A” and ECM terminal
Examine (LGN/Y) wire in harness
“26” on Breakout Box.
for open circuit and repair.
2
Resistance less than 1.0 ohm?
YES
NO
Using a DVOM, measure the resistance between ECM
Examine (BK/W) wire in harness
terminal “7” and terminal “26” on Breakout Box.
for open circuit and repair.
Resistance greater than 1.0 megohm?
YES
NO
Using a DVOM, measure the resistance between ECM
Examine (LGN/Y) and (BK/W)
terminal “7” on Breakout Box and ground.
wires in harness for short between
Resistance greater than 1.0 megohm?
these two circuits and repair.
YES
NO
Remove TMAP sensor and measure resistance
Examine harness
across the “A” and “B” terminals of the TMAP sensor
for short to ground
3
Directly with sensor at room temperature
and repair.
(60-90° F or 16-32° C),
Is resistance between 2.0k ohms and 5.0k ohms?
YES
NO
Perform 4.8 WIGGLE TEST on steps marked with a
4
Replace
BOLD ASTERISK above to locate intermittents.
TMAP sensor.
Repair as necessary.
At some point in the flow chart you may be
Clear DTCs using speedometer self diagnostics. See 4.6
instructed to jump directly to a the box with the
SPEEDOMETER SELF DIAGNOSTICS. Confirm proper
bold asterisk. Disregard the asterisk (but not the
operation with no check engine
instruction box) if your normal progression
lamp.
through the chart brings you to this location.
fc01221_en
4-70 2008 Sportster Diagnostics: Engine Management
DTC P0117,
P0118
4.19
locks, improperly formed or damaged terminals, poor ter-
GENERAL
minal- to-wire connection and damaged harness.
ET Sensor
•
Perform 4.8 WIGGLE TEST to locate intermittents: If
The ECM supplies and monitors a voltage signal (terminal "6")
connections and harness check out OK, use a DVOM to
to one side of the Engine Temperature (ET) sensor. The other
check the engine temperature sensor voltage reading
side of the ET sensor is connected to a common sensor ground
while moving related connectors and wiring harness. If
(terminal "26") of the ECM.
the failure is induced, the engine temperature sensor
voltage reading will change.
See Figure 4-38. The ET sensor is a thermistor device, which
means that at a specific temperature it will have a specific
•
Shifted sensor: Refer to Table 4-24. This table may be
resistance across its terminals. As this resistance varies, so
used to test the engine temperature sensor at various
does the voltage (terminal "6").
temperature levels in order to evaluate the possibility of a
shifted
(out-of-calibration) sensor which may result in
•
At high temperatures, the resistance of the sensor is very
driveability problems.
low, which effectively lowers the signal voltage on terminal
"6".
•
An intermittent may be caused by a poor connection,
rubbed through wire insulation or a wire broken inside the
•
At low temperatures, the resistance is very high, allowing
insulation.
the voltage to rise close to 5 volts.
The ECM monitors this voltage to compensate for various
NOTE
operating conditions. The ECM also uses the sensor input as
All voltage and resistance values are approximate (±20%).
a reference for determining IAC pintle position.
Measure ET sensor resistance between ECM terminal "6" and
system ground (ECM terminal "26").
ed02853
Table 4-24. ET Sensor Table
TEMP °C
RESIST-
COLD
HOT
TEMP °F
ANCE
VOLTAGE
VOLTAGE
-20
98936
4.9
-4
-10
56102
4.8
14
0
32957
4.5
32
10
20000
4.3
50
20
12511
3.9
68
25
10000
3.6
77
30
8045
3.4
86
40
5304
2.9
104
Figure 4-38. Engine Temperature Sensor
50
3577
2.4
122
60
2470
1.9
140
70
1739
1.5
158
Table 4-23. Code Description
80
1246
1.2
4.0
176
DTC
DESCRIPTION
90
907.7
0.9
3.7
194
P0117
ET sensor voltage low
100
671.2
3.4
212
P0118
ET sensor open/high
* Between 40-50° C the ECM changes scaling. Voltages for
DIAGNOSTICS
ECT sensor will shift scales in that range. This provides proper
sensor resolution for all temperatures.
PART NUMBER
TOOL NAME
Diagnostic Notes
HD-41404-B
HARNESS CONNECTOR TEST KIT
Each reference number below correlates to a circled number
HD-43876
BREAKOUT BOX
on the flow chart(s).
Diagnostic Tips
1. Connect BREAKOUT BOX (Part No. HD-43876) to EFI
wire harness only
(leave ECM disconnected). See
Once the engine is started, the ET voltage should lower steadily
4.7 BREAKOUT BOX: EFI.
in two stages.
Check the following conditions:
2. Use HARNESS CONNECTOR TEST KIT (Part No. HD-
41404-B), gray pin probes and patch cords.
•
Poor connection: Inspect ECM and harness connector
[78] for backed out terminals, improper mating, broken
2008 Sportster Diagnostics: Engine Management 4-71
3. Use HARNESS CONNECTOR TEST KIT (Part No. HD-
4. Replace ET sensor. See the Service Manual.
41404-B), gray socket probes and patch cords.
em01207
ET
Sensor
[90A]
1
2
1
2
[90B]
BK/W
To TP, TMAP sensors and jiffy switch
BK/W
PK/Y
[78B]
6
26
6
26
[78A]
ECM
Figure 4-39. ET Sensor Circuit
Table 4-25. Wire Harness Connectors
NO.
DESCRIPTION
TYPE
LOCATION
[78]
Electronic Control Module (ECM)
36-place Packard
Under seat
[90]
Engine
Temperature (ET) sensor
2-place Delphi
Above throttle body, right side
4-72 2008 Sportster Diagnostics: Engine Management
ET Sensor (Part 1 of 2): DTC P0117
Connect Breakout Box to connector [78B] leaving ECM
disconnected. With engine at room temperature (60-90° F
or 16-32° C), use a DVOM to measure resistance across
1
terminals “6” and “26” on Breakout Box. If engine
is warm, refer to Table 4-24.
Resistance between 8.0k ohms and 20k ohms?
YES
NO
Connect ECM to Breakout Box.
Perform 4.8 WIGGLE TEST to
check for intermittents.
STOP
Intermittents present?
Go to ET Sensor (Part 2 of 2):
DTC P0117.
NO
YES
Disconnect ET sensor connector
While wiggling harness, perform
[90]. Turn ignition ON. Using a
steps marked by BOLD
DVOM, measure the voltage
ASTERISKS under ET Sensor
between terminal “6” (positive) and
(Part 2 of 2): DTC P0117.
terminal “26” (negative) on
Repair as necessary.
Breakout Box. Voltage
approximately 5 volts?
YES
NO. Less than
NO. Greater than
4.7 volts.
5.3 volts.
Replace ET sensor, clear
With ET sensor disconnected,
Unplug ECM leaving Breakout Box
diagnostic trouble codes (DTCs)
disconnect ECM connector [78B].
connected at vehicle harness.
and road test. Did check engine
Measure resistance between terminal 6
Measure voltage between terminal
lamp illuminate and set DTC
and terminals 10 or 28. Resistance less
“6” and terminals “10” or “28”.
P0117 or P0118?
than 1 megohm?
Voltage 0 volts?
YES
NO
YES
NO
YES
NO
Install original
Repair short to
Replace ECM.
Replace ECM.
System
Examine ET signal
ET sensor,
ground on
Reprogram and
Reprogram and
OK.
wire (PK/Y) for
replace ECM, perform
PK/Y wire.
learn password.
learn password.
short to voltage
password learning
and repair.
and road test.
At some point in the flow chart you
Clear DTCs using speedometer self diagnostics. See 4.6
may be instructed to jump directly
SPEEDOMETER SELF DIAGNOSTICS. Confirm proper
to a the box with the bold asterisk.
operation with no check engine lamp.
Disregard the asterisk (but not the
instruction box) if your normal progression
through the chart brings
you to this location.
fc01222_en
2008 Sportster Diagnostics: Engine Management 4-73
ET Sensor (Part 2 of 2): DTC P0117
Continued from
ET Sensor (Part 1 of 2): DTC P0117.
Disconnect ET sensor connector [90B]
and examine for damage.
Connector OK?
YES
NO
Using a DVOM, measure the resistance
Repair
between ET sensor connector [90B] terminal “1” and
connector.
2
ECM terminal “6” on Breakout Box.
Resistance less than 1.0 ohm?
NO
YES
Using a DVOM, measure the resistance
Examine (PK/Y) wire in harness
between ET sensor connector [90B] terminal “2” and
for open circuit and repair.
ECM terminal “26” on Breakout Box.
2
Resistance less than 1.0 ohm?
YES
NO
Using a DVOM, measure the resistance between ECM
Examine (BK/W) wire in harness
terminal “6” and terminal “26” on Breakout Box.
for open circuit and repair.
Resistance greater than 1.0 megohm?
YES
NO
Using a DVOM, measure the resistance between ECM
Examine (PK/Y) and (BK/W) wires
terminal
“6” on Breakout Box and ground.
in harness for short between these
Resistance greater than 1.0 megohm?
two circuits and repair
YES
NO
Remove ET sensor and measure resistance across the
Examine harness
terminals of the ET sensor directly. Again, with sensor
for short to ground
3
and repair.
at room temperature (60-90 F or 16-32 C).
Is resistance between 8.0k ohms and 20k ohms?
NO
YES
Perform 4.8 WIGGLE TEST on steps marked with a
4
Replace
BOLD ASTERISK above to locate intermittents.
ET sensor.
Repair as necessary.
At some point in the flow chart
you may be instructed to jump
directly to a the box with the bold
Clear DTCs using speedometer self diagnostics. See 4.6
asterisk. Disregard the asterisk
SPEEDOMETER SELF DIAGNOSTICS. Confirm proper
(but not the instruction box) if your
operation with no check engine lamp.
normal progression through the
chart brings you to this location.
fc01223_en
4-74 2008 Sportster Diagnostics: Engine Management
DTC P0122,
P0123
4.20
wide open. A short to ground or open on the (GY/V) or (R/W)
GENERAL
wires also will result in a DTC P0122. A short to ground or open
Throttle Position (TP) Sensor
on the (R/W) wire (+5v REF) sets multiple codes as described
below.
The ECM supplies a 5 volt signal (terminal "14") to the Throttle
Position (TP) sensor. The TP sensor sends a signal back to
NOTES
the ECM (terminal "24"). The returned signal varies in voltage
The TMAP, Jiffy Stand, and TP sensors are connected to the
according to throttle position.
same reference line (+5V Vref). If the reference line goes to
•
At idle (closed throttle), the signal is typically in the range
ground or open, multiple codes will be set (DTC P0107, P0108,
of 0.20-0.80 volts.
P0122, P0123, P1501, P1502). Start with the trouble code
having the lowest ranking value.
•
At wide open throttle, the signal is normally 4.0-4.9 volts.
Check for the following conditions:
A DTC P0122 or P0123 will set if the TP sensor voltage signal
does not fall within the acceptable range.
•
Poor Connection: Inspect ECM and harness connector
[78B] for backed out terminals, improper mating, broken
locks, improperly formed or damaged terminals, poor ter-
Table 4-26. Code Description
minal- to-wire connection and damaged harness.
DTC
DESCRIPTION
•
Perform 4.8 WIGGLE TEST to locate intermittents: If
P0122
TP sensor open/low
connections and harness check out OK, monitor TP sensor
voltage using a DVOM while moving related connectors
P0123
TP sensor high
and wiring harness. If the failure is induced, the TP sensor
voltage reading will change.
ed02854
•
TP sensor scaling: Observe the TP sensor voltage display
while opening the throttle with engine stopped and Ignition
Switch ON. Display should vary from closed TP sensor
voltage (when throttle is closed) to greater than 4.0 volts
(when throttle is held wide open). As the throttle is slowly
moved, the voltage should change gradually without spikes
or low voltages being observed.
•
Check TP sensor voltage reading with DVOM. If TP sensor
is equal to or greater than 3.8 volts then the system is in
"clear flood" mode and engine will not start. While spark
is present, fuel is shut off. Problem can be mechanical,
such as stuck throttle cables.
Diagnostic Notes
Each reference number below correlates to a circled number
on the flow chart(s).
1. Connect a BREAKOUT BOX (Part No. HD-43876) between
EFI wire harness and ECM before measuring voltage. See
4.7 BREAKOUT BOX: EFI. Using a DVOM to measure
voltage, take reading across terminal "24" (positive lead)
and terminal "26" (negative lead) on Breakout Box.
2. Replace TP sensor. See Service Manual.
Figure 4-40. Throttle Position (TP) Sensor Location
3. Use HARNESS CONNECTOR TEST KIT (Part No. HD-
41404-B), gray pin probes and patch cords.
DIAGNOSTICS
PART NUMBER
TOOL NAME
HD-41404-B
HARNESS CONNECTOR TEST KIT
HD-43876
BREAKOUT BOX
Diagnostic Tips
The DVOM reads throttle position in volts. Voltage should
increase at a steady rate as the throttle is moved from idle to
2008 Sportster Diagnostics: Engine Management 4-75
em01208
TP
Sensor
A
B
C
[88A]
[88B]
A
B
C
BK/W
To TMAP sensor
R/W
To TMAP sensor
[145B]
3
5
12
[145A]
3
5
12
R/W
To Jiffy Stand Sensor
BK/W
To ET and O2 sensors
BK/W
To VSS
BK/R
GY/V
R/W
[78B]
14
24
26
14
24
26
[78A]
ECM
Figure 4-41. TP Sensor Circuit
Table 4-27. Wire Harness Connectors
NO.
DESCRIPTION
TYPE
LOCATION
[78]
Electronic Control Module (ECM)
36-place Packard
Under seat
[88]
Throttle position (TP) sensor
3-place Delphi
Behind air cleaner backing plate
[145]
Engine harness
16-place Molex
Under seat
4-76 2008 Sportster Diagnostics: Engine Management
TP Sensor (Part 1 of 2): DTC P0122, P0123
With ignition key ON, measure TP sensor voltage while
gradually opening throttle. Does voltage increase
1
steadily with no spikes or low voltages from 0.2-0.8 volts
at idle (closed throttle) to 4.0-4.9 volts at wide open
throttle?
YES
NO
Check engine lamp ON
Voltage is
Low voltage
continuously and
greater than
or spikes
DTC P0122 or P0123
4.95 volts.
observed.
the only one set?
Unplug TP sensor connector [88B]
and measure voltage between
terminal “B” (+) and terminal “A” (-)
STOP
with ignition ON.
YES
NO
Is reading 4.8-5.0 volts?
Go to TP Sensor
Replace ECM.
Perform 4.8 WIGGLE
(Part 2 of 2): DTC
Reprogram and
YES
NO
TEST to check for
P0122, P0123.
learn password.
intermittents.
Intermittents present?
Disconnect ECM from
Measure
Breakout Box. Check
Resistance
resistance between ECM
between TP
YES
NO
terminal “24” on Breakout Box
sensor connector
to chassis ground. Greater
[88B]
than 1 megohm?
terminal “B” to
While wiggling harness,
Replace TP sensor, clear
ECM terminal “14”
start with the first step of
codes and road test.
on Breakout Box.
TP Sensor (Part 2 of 2):
2
Did check engine lamp
YES
NO
Less than
DTC P0122, P0123
illuminate and set DTC
1.0 ohm?
(marked by BOLD
P0122 or P0123?
ASTERISK).
Replace
Find short to
Repair as necessary.
2
TP sensor.
ground on (GY/V)
signal wire.
YES
NO
YES
NO
Install original
System
TP sensor, replace ECM
OK.
(reprogram and learn
Repair open
Repair open
password) and road test.
in (BK/W) wire.
in (R/W) wire.
At some point in the flow chart you
may be instructed to jump directly
to a the box with the bold asterisk.
Disregard the asterisk (but not the
instruction box) if your normal progression
Clear DTCs using speedometer self diagnostics. See 4.6
through the chart brings
SPEEDOMETER SELF DIAGNOSTICS. Confirm proper
you to this location.
operation with no check engine lamp.
fc01224_en
2008 Sportster Diagnostics: Engine Management 4-77
TP Sensor (Part 2 of 2): DTC P0122, P0123
Continued from TP Sensor (Part 1 of 2) DTC P0122,
P0123.
With ignition key OFF, disconnect ECM connector
[78B]. Turn ignition key ON. Voltage greater than 0
volts across terminal “24” and terminal “26” on Breakout
Box?
YES
NO
Repair short
Measure resistance
between (GY/V) signal
between ECM terminal
wire and 12 volts.
“24” on Breakout Box and
3
TP sensor connector [88B]
terminal “C”.
Less than 0.5 ohm?
YES
NO
Measure resistance from
Repair open
(GY/V)
TP sensor connector [88B]
3
signal wire.
terminal “C” to terminal “B”.
Less than 1.0 megohm?
YES
NO
Replace
Repair short
2
TP sensor.
between (R/W) and
(GY/V) signal wire.
At some point in the flow chart you
may be instructed to jump directly to
a the box with the bold asterisk.
Disregard the asterisk (but not the
instruction box) if your normal
progression through the chart brings
you to this location.
Clear DTCs using speedometer self diagnostics. See 4.6
SPEEDOMETER SELF DIAGNOSTICS. Confirm proper operation with
no check engine lamp.
fc01225_en
4-78 2008 Sportster Diagnostics: Engine Management
DTC P0131,
P0132, P0134, P0151, P0152, P0154
4.21
GENERAL
DIAGNOSTICS
Oxygen Sensor
PART NUMBER
TOOL NAME
See Figure 4-42. The Oxygen (O2) sensor provides a signal
HD-43876
BREAKOUT BOX
to the ECM which indicates whether the engine is running rich
Diagnostic Tips
or lean.
Diagnostic codes for the O2 sensor may be seen during the
•
A DTC P0131 (front) or P0151 (rear) is set when the ECM
detects an excessively lean condition for a specified length
vehicle break-in period. The O2 sensor diagnostic codes will
of time. DTCs may also set if O2 sensor fails.
not illuminate the check engine lamp for current or historic
codes and will only be indicated by Digital Technician or
•
A DTC P0132 (front) or P0152 (rear) is set when the ECM
speedometer self diagnostics. If the diagnostic codes are
detects an excessively rich condition for a specified length
reported during the break-in period, clear or ignore the codes
of time. DTCs may also set if O2 sensor fails.
until the break-in period is completed. All historic O2 sensor
•
A DTC P0134 is set when the front O2 sensor circuit is
diagnostic codes are to be ignored and cleared.
open or sensor is too cold to respond. A DTC P0154 is
The DVOM displays the signal from the O2 sensor in volts. This
set when the rear O2 sensor circuit is open or sensor is
voltage will have an average value tending towards lean, rich
too cold to respond.
or ideal value depending on operating temperature of the
engine, engine speed and throttle position. An open/short to
When the air/fuel mixture is ideal, approximately 14.6 parts air
voltage or short to ground in the (PK/O) wire (front) and
to 1 part fuel, the voltage will be approximately 0.45V.
(PK/GN) wire (rear) will cause the engine to run rich (short to
ground) or lean (short to voltage) until fault is detected. Once
Table 4-28. Code Description
fault is detected, vehicle will run in open loop.
DTC
DESCRIPTION
Check for the following conditions:
P0131
Front O2
sensor low or engine running lean
•
Poor connection. Inspect the ECM harness connector
P0132
Engine running rich
[78], fuel injector connectors [84, 85] and O2 sensor con-
nector wiring for backed out terminals, improper mating,
P0134
Front O2
sensor open/not responding/high
broken locks, improperly formed or damaged terminals,
P0151
Rear O2
sensor low or engine running lean
poor terminal-to-wire connection and damaged harness.
P0152
Engine running rich
•
Dirty/stuck open injectors. The motorcycle may run lean
P0154
Rear O2
sensor open/not responding/high
(dirty/clogged injectors) or rich (stuck open injectors) if
there is an injector problem. This could also cause poor
fuel economy and performance.
ed02856
•
Loose oxygen sensor. If the O2 sensor is loose, engine
performance may be affected. This could also show up
as a slow changing O2 sensor voltage.
•
Loose/leaking exhaust. This can cause a poor ground
connection for sensor or allow fresh air into the exhaust
system. If fresh air enters exhaust system, the O2 sensor
will read a lean condition, causing the system to go rich.
•
Engine misfire. See 4.17 MISFIRE AT IDLE OR UNDER
LOAD.
Diagnostic Notes
Each reference number below correlates to a circled number
on the flow chart(s).
1. Connect a BREAKOUT BOX (Part No. HD-43876) between
Figure 4-42. Oxygen Sensor
EFI wire harness and ECM before measuring voltage. See
4.7 BREAKOUT BOX: EFI.
2.
5 volts is typical for a cold engine. Once the O2 sensors
are up to operating temperature, typical voltage is 0.45
volt.
3. See 4.9 INTAKE LEAK TEST.
2008 Sportster Diagnostics: Engine Management 4-79
em01209
Front Oxygen
Rear Oxygen
Sensor
Sensor
[138A]
1
2
1
2
[137A]
[138B]
1
2
1
2
[137B]
BK/W
BK/W
To ET sensor
[78A]
8
23
26
8
23
26
[78B]
ECM
Figure 4-43. Oxygen Sensor
Table 4-29. Wire Harness Connectors
NO.
DESCRIPTION
TYPE
LOCATION
[78]
Electronic Control Module (ECM)
36-place Packard
Under seat
[137]
Rear oxygen sensor
2-place Amp
H-bracket
[138]
Front oxygen sensor
2-place Amp
Voltage regulator electrical caddy
4-80 2008 Sportster Diagnostics: Engine Management
Oxygen Sensor (Part 1 of 3): DTC P0131, P0132, P0134, P0151, P0152, P0154
Disconnect O2 sensor from harness. Connect DVOM to terminal “8” (front, +)
1
and terminal “26” (-), “23” (rear, +) and terminal “26” (-) of connector [78]
(gray).
2
Turn ignition ON. Observe O2 voltage. Is it approximately 5.0 volts?
YES
NO.
NO.
0 volts.
Greater than
5 volts.
STOP
Install Breakout Box (HD-43876)
leaving ECM [78] disconnected
Install Breakout Box (HD-43876)
Go to Oxygen Sensor
from the Breakout Box. Measure
leaving ECM [78] disconnected
1
1
(Part 2 of 3): DTC
continuity to ground on terminal
from the Breakout Box.
P0131, P0132, P0134,
“8” (front) or terminal “23” (rear).
Is voltage present?
P0151, P0152, P0154.
Is continuity present?
YES
NO
YES
NO
Locate and repair
Inspect (PK/O) (front)
short to ground on
Replace ECM.
and/or (PK/GN) (rear)
Replace ECM.
(PK/O) (front) and/or
See Service Manual.
wire. for shorts to
See Service Manual.
(PK/GN) (rear) wire.
voltage and repair.
Clear DTCs using speedometer self diagnostics.
See 4.6 SPEEDOMETER SELF DIAGNOSTICS Confirm
proper operation with no check engine lamp
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2008 Sportster Diagnostics: Engine Management 4-81
Oxygen Sensor (Part 2 of 3): DTC P0131, P0132, P0134, P0151, P0152, P0154
Continued from Oxygen Sensor (Part 1 of 3): DTC P0131,
P0132, P0134, P0151, P0152, P0154.
Turn ignition OFF and reconnect O2 sensor. Turn ignition ON
and start engine. Allow engine to reach operating temperature.
With engine idling, does voltage at terminal “8” (+) and
terminal “26” (-) (front) and terminal “23” (+) and terminal “26”
(-) (rear) quickly fluctuate between 0 and 1.0 volts?
NO.
NO.
NO.
YES
0.0-0.4 volts.
0.6-1.0 volts.
Slow or no change.
Perform 4.15
Perform 4.15
Check continuity between terminal
FUEL PRESSURE
FUEL PRESSURE
“8” [78] (front) and terminal “1”
STOP
TEST. Pressure
TEST. Pressure
[138] (front) or terminal “23” [78]
too low?
too high?
(rear) and terminal “1” [137] (rear).
Go to Oxygen
Continuity resent?
Sensor (Part 3 of 3):
DTC P0131, P0132,
YES
NO
YES
NO
P0134, P0151,
YES
NO
P0152, P0154.
Repair low
Check for
Check for
pressure problem.
restricted fuel filter
Replace fuel
injectors stuck
See 4.15 FUEL
or fuel line.
pressure regulator.
open. See 4.22
See Service
Replace O2
PRESSURE
Restriction
DTC P0261,
Manual.
sensor. See
TEST.
present?
P0262, P0263,
Service Manual.
P0264. Retest.
Repair open
on (PK/O) (front)
YES
NO
and/or (PK/GN)
(rear) wire.
Check for air leaks
Replace fuel line
at induction
or filter
3
module. Air leak
present?
YES
NO
Repair.
Fuel injectors may be
dirty. See Service
Manual.
Clear DTCs using speedometer self diagnostics. See 4.6
SPEEDOMETER SELF DIAGNOSTICS. Confirm proper operation
with no check engine lamp.
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4-82 2008 Sportster Diagnostics: Engine Management
Oxygen Sensor (Part 3 of 3): DTC P0131, P0132, P0134, P0151, P0152, P0154
Continued from Oxygen Sensor (Part 2 of 3):
DTC P0131, P0132, P0134, P0151, P0152, P0154.
Check for intermittents by performing 4.8 WIGGLE
TEST starting from beginning of chart.
Intermittents present?
YES
NO
Repair
Replace O2 sensor. See
as necessary.
Service Manual. Clear codes
and road test. Check for
DTCs. Did O2 sensor set
a P0131, P0132, P0134,
P0151, P0152 or P0154?
YES
NO
Install original O2 sensor
System
and replace ECM. See
now OK.
Service Manual.
Road test again to verify.
Clear DTCs using speedometer self diagnostics. See 4.6
SPEEDOMETER SELF DIAGNOSTICS. Confirm proper
operation with no check engine lamp.
fc01228_en
2008 Sportster Diagnostics: Engine Management 4-83
DTC P0261,
P0262, P0263, P0264
4.22
1. See Service Manual for all service information.
GENERAL
2. Use HARNESS CONNECTOR TEST KIT (Part No. HD-
Fuel Injectors
41404-B), purple pin probe and patch cord.
The fuel injectors are solenoids that allow pressurized fuel into
3. Connect a BREAKOUT BOX (Part No. HD-43876) between
the intake tract. The injectors are timed to the engine cycle and
EFI wire harness and ECM. See 4.7 BREAKOUT BOX:
triggered sequentially. The power for the injectors comes from
EFI.
the system relay. The system relay also provides power for
the fuel pump and the ignition coil. The ECM provides the path
to ground to trigger the injectors.
ed02060
NOTE
ECM fuse and system relay failures or wiring harness problems
will cause 12 volt power to be lost to both injectors, ignition
coils and fuel pump.
Table 4-30. Code Description
DTC
DESCRIPTION
P0261
Front injector open/low
P0262
Front injector high
P0263
Rear injector open/low
P0264
Rear injector high
DIAGNOSTICS
Figure 4-44. Fuel Injector Test Lamp (Part No. HD-34730-2C)
PART NUMBER
TOOL NAME
HD-41404-B
HARNESS CONNECTOR TEST KIT
HD-43876
BREAKOUT BOX
Diagnostic Notes
Each reference number below correlates to a circled number
on the flow chart(s).
4-84 2008 Sportster Diagnostics: Engine Management