Infiniti I30. Emission Control System (2003 year). Instruction - part 14

DTC Confirmation Procedure

NHEC1456

NOTE:
If “DTC Confirmation Procedure” has been previously conducted,
always turn ignition switch “OFF” and wait at least 10 seconds
before conducting the next test.
TESTING CONDITION:
Before performing the following procedure, confirm that bat-
tery voltage is more than 10V at idle.

SEF058Y

With CONSULT-II

Turn ignition switch “ON”.

Select “DATA MONITOR” mode with CONSULT-II.

Start engine and let it idle for 1 second.

If DTC is detected, go to “Diagnostic Procedure”, EC-211.

With GST

Follow the procedure “With CONSULT-II” above.

IDX

DTC P0122, P0123 TP SENSOR

DTC Confirmation Procedure

EC-209

Wiring Diagram

NHEC1337

MEC362E

DTC P0122, P0123 TP SENSOR

Wiring Diagram

EC-210

Specification data are reference values and are measured between each terminal and ground.

CAUTION:

Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM’s transistor. Use a ground other than ECM terminals, such as the ground.

TERMI-

NAL

NO.

WIRE

COLOR

ITEM

CONDITION

DATA (DC Voltage)

Sensors’ ground

[Engine is running]

쐌

Warm-up condition

쐌

Idle speed

Approximately 0V

Throttle position sensor
1

[Ignition switch “ON”]

쐌

Engine stopped

쐌

Shift lever position is “D”

쐌

Accelerator pedal released

More than 0.36V

[Ignition switch “ON”]

쐌

Engine stopped

쐌

Shift lever position is “D”

쐌

Accelerator pedal fully depressed

Less than 4.75V

Throttle position sensor
2

[Ignition switch “ON”]

쐌

Engine stopped

쐌

Shift lever position is “D”

쐌

Accelerator pedal released

Less than 4.75V

[Ignition switch “ON”]

쐌

Engine stopped

쐌

Shift lever position is “D”

쐌

Accelerator pedal fully depressed

More than 0.36V

111

Sensor’s power supply

[Ignition switch “ON”]

Approximately 5V

Diagnostic Procedure

NHEC1338

RETIGHTEN GROUND SCREWS

1. Turn ignition switch “OFF”.
2. Loosen and retighten engine ground screws.

SEC047D

䊳

GO TO 2.

IDX

DTC P0122, P0123 TP SENSOR

Wiring Diagram (Cont’d)

EC-211

CHECK THROTTLE POSITION SENSOR 2 POWER SUPPLY CIRCUIT

1. Disconnect electric throttle control actuator harness connector.
2. Turn ignition switch “ON”.

SEC054D

3. Check voltage between electric throttle control actuator terminal 1 and ground with CONSULT-II or tester.

PBIB0082E

Voltage: Approximately 5V

OK or NG

䊳

GO TO 3.

䊳

Repair open circuit or short to ground or short to power in harness or connectors.

CHECK THROTTLE POSITION SENSOR 2 GROUND CIRCUIT FOR OPEN AND SHORT

1. Turn ignition switch “OFF”.
2. Check harness continuity between electric throttle control actuator terminal 5 and engine ground.

Refer to Wiring Diagram.

Continuity should exist.

3. Also check harness for short to ground and short to power.

OK or NG

䊳

GO TO 5.

䊳

GO TO 4.

DETECT MALFUNCTIONING PART

Check the following.

쐌

Joint connector-20

쐌

Harness for open or short between electric throttle control actuator and ECM

䊳

Repair open circuit or short to ground or short to power in harness or connectors.

DTC P0122, P0123 TP SENSOR

Diagnostic Procedure (Cont’d)

EC-212

CHECK THROTTLE POSITION SENSOR 2 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1. Disconnect ECM harness connector.
2. Check harness continuity between ECM terminal 84 and electric throttle control actuator terminal 2.

Refer to Wiring Diagram.

Continuity should exist.

3. Also check harness for short to ground and short to power.

OK or NG

䊳

GO TO 6.

䊳

Repair open circuit or short to ground or short to power in harness or connectors.

CHECK THROTTLE POSITION SENSOR

Refer to “Component Inspection”, EC-213.

OK or NG

䊳

GO TO 8.

䊳

GO TO 7.

REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR

1. Replace the electric throttle control actuator.
2. Perform “Throttle Valve Closed Position Learning”, EC-71.
3. Perform “Idle Air Volume Learning”, EC-71.

䊳

INSPECTION END

CHECK INTERMITTENT INCIDENT

Refer to “TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT”, EC-151.

䊳

INSPECTION END

SEC900C

Component Inspection

NHEC1339

THROTTLE POSITION SENSOR
1.

Reconnect all harness connectors disconnected.

Perform “Throttle Valve Closed Position Learning”, EC-71.

Turn ignition switch “ON”.

Set selector lever to “D” position.

Check voltage between ECM terminals 83 (TP sensor 1), 84
(TP sensor 2) and engine ground under the following condi-
tions.

Terminal

Accelerator pedal

Voltage

83
(Throttle position sensor
1)

Fully released

More than 0.36V

Fully depressed

Less than 4.75V

84
(Throttle position sensor
2)

Fully released

Less than 4.75V

Fully depressed

More than 0.36V

If NG, replace electric throttle control actuator and go to the
next step.

Perform “Throttle Valve Closed Position Learning”, EC-71.

Perform “Idle Air Volume Learning”, EC-71.

IDX

DTC P0122, P0123 TP SENSOR

Diagnostic Procedure (Cont’d)

EC-213

Description

NHEC0869

NOTE:
If DTC P0125 is displayed with P0117, P0118, first perform the
trouble diagnosis for DTC P0117, P0118. Refer to EC-203.

SEF594K

COMPONENT DESCRIPTION

NHEC0869S01

The engine coolant temperature sensor is used to detect the
engine coolant temperature. The sensor modifies a voltage signal
from the ECM. The modified signal returns to the ECM as the
engine coolant temperature input. The sensor uses a thermistor
which is sensitive to the change in temperature. The electrical
resistance of the thermistor decreases as temperature increases.

SEF012P

<Reference data>

Engine coolant

temperature

°C (°F)

Voltage*

Resistance

Ω

−10 (14)

4.4

7.0 - 11.4

20 (68)

3.5

2.1 - 2.9

50 (122)

2.2

0.68 - 1.00

90 (194)

0.9

0.236 - 0.260

*: These data are reference values and are measured between ECM terminal 93
(Engine coolant temperature sensor) and ground.

CAUTION:

Do not use ECM ground terminals when measuring input/
output voltage. Doing so may result in damage to the ECM’s
transistor. Use a ground other than ECM terminals, such as
the ground.

On Board Diagnosis Logic

NHEC0870

This self-diagnosis has the one trip detection logic.

DTC No.

Trouble diagnosis

name

DTC Detecting Condition

Possible Cause

P0125
0125

Insufficient engine
coolant temperature
for closed loop fuel
control

쐌

Voltage sent to ECM from the sensor is not

practical, even when some time has passed
after starting the engine.

쐌

Engine coolant temperature is insufficient for
closed loop fuel control.

쐌

Harness or connectors
(The sensor circuit is open or
shorted.)

쐌

Engine coolant temperature sensor

쐌

Thermostat

DTC P0125 ECT SENSOR

Description

EC-214

SEF174Y

DTC Confirmation Procedure

NHEC0871

CAUTION:

Be careful not to overheat engine.
NOTE:
If “DTC Confirmation Procedure” has been previously conducted,
always turn ignition switch “OFF” and wait at least 10 seconds
before conducting the next test.

WITH CONSULT-II

NHEC0871S01

Turn ignition switch “ON”.

Select “DATA MONITOR” mode with CONSULT-II.

Check that “COOLAN TEMP/S” is above 10°C (50°F).
If it is above 10°C (50°F), the test result will be OK.
If it is below 10°C (50°F), go to following step.

Start engine and run it for 65 minutes at idle speed.
If “COOLAN TEMP/S” increases to more than 10°C (50°F)
within 65 minutes, stop engine because the test result will
be OK.

If DTC is detected, go to “Diagnostic Procedure”, EC-215.

WITH GST

NHEC0871S02

Follow the procedure “WITH CONSULT-II” above.

Diagnostic Procedure

NHEC0872

CHECK ENGINE COOLANT TEMPERATURE SENSOR

Check resistance between engine coolant temperature sensor terminals 1 and 2 as shown in the figure.

SEF304X

OK or NG

䊳

GO TO 2.

䊳

Replace engine coolant temperature sensor.

IDX

DTC P0125 ECT SENSOR

DTC Confirmation Procedure

EC-215

CHECK THERMOSTAT OPERATION

When the engine is cold [lower than 70°C (158°F)] condition, grasp lower radiator hose and confirm the engine coolant
does not flow.

OK or NG

䊳

GO TO 3.

䊳

Repair or replace thermostat. Refer to LC-18, “Thermostat”.

CHECK INTERMITTENT INCIDENT

쐌

Refer to “TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT”, EC-151.

쐌

Refer to Wiring Diagram, EC-205.

䊳

INSPECTION END

DTC P0125 ECT SENSOR

Diagnostic Procedure (Cont’d)

EC-216

SEC266C

SEF012P

Component Description

NHEC0767

The intake air temperature sensor is mounted to the air duct hous-
ing. The sensor detects intake air temperature and transmits a sig-
nal to the ECM.
The temperature sensing unit uses a thermistor which is sensitive
to the change in temperature. Electrical resistance of the thermistor
decreases in response to the temperature rise.
<Reference data>

Intake air

temperature

°C (°F)

Voltage*

Resistance

Ω

25 (77)

3.32

1.9 - 2.1

*: These data are reference values and are measured between ECM terminal 66
(Intake air temperature sensor) and body ground.

CAUTION:

Do not use ECM ground terminals when measuring input/
output voltage. Doing so may result in damage to the ECM’s
transistor. Use a ground other than ECM terminals, such as
the ground.

On Board Diagnosis Logic

NHEC0768

DTC No.

Trouble diagnosis

name

DTC Detecting Condition

Possible Cause

P0127
0127

Intake air temperature
too high

Rationally incorrect voltage from the sensor is sent
to ECM, compared with the voltage signal from
engine coolant temperature sensor.

쐌

Harness or connectors
(The sensor circuit is open or
shorted.)

쐌

Intake air temperature sensor

DTC Confirmation Procedure

NHEC0770

NOTE:
If “DTC Confirmation Procedure” has been previously conducted,
always turn ignition switch “OFF” and wait at least 10 seconds
before conducting the next test.

CAUTION:

Always drive vehicle at a safe speed.
TESTING CONDITION:
This test may be conducted with the drive wheels lifted in the
shop or by driving the vehicle. If a road test is expected to be
easier, it is unnecessary to lift the vehicle.

SEF176Y

WITH CONSULT-II

NHEC0770S03

Wait until engine coolant temperature is less than 90°C
(194°F).

Turn ignition switch “ON”.

Select “DATA MONITOR” mode with CONSULT-II.

Check the engine coolant temperature.

If the engine coolant temperature is not less than 90°C
(194°F), turn ignition switch “OFF” and cool down engine.

쐌

Perform the following steps before engine coolant temperature
is above 90°C (194°F).

Turn ignition switch “ON”.

IDX

DTC P0127 IAT SENSOR

Component Description

EC-217

Select “DATA MONITOR” mode with CONSULT-II.

Start engine.

Hold vehicle speed at more than 70 km/h (43 MPH) for 100
consecutive seconds.

If 1st trip DTC is detected, go to “Diagnostic Procedure”,
EC-218.

WITH GST

NHEC0770S04

Follow the procedure “With CONSULT-II” above.

Diagnostic Procedure

NHEC0772

CHECK INTAKE AIR TEMPERATURE SENSOR

Check resistance between intake air temperature sensor terminals 3 and 5 as shown in the figure.

MTBL1143

SEF012P

OK or NG

䊳

GO TO 2.

䊳

Replace intake air temperature sensor.

CHECK INTERMITTENT INCIDENT

쐌

Refer to “TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT”, EC-151.

쐌

Refer to wiring diagram, EC-200.

䊳

INSPECTION END

DTC P0127 IAT SENSOR

DTC Confirmation Procedure (Cont’d)

EC-218

On Board Diagnosis Logic

NHEC1289

Engine coolant temperature has not risen enough to open the ther-
mostat even though the engine has run long enough.
This is due to a leak in the seal or the thermostat open stuck.

DTC No.

Trouble diagnosis

name

DTC Detecting Condition

Possible Cause

P0128
0128

Thermostat function

The engine coolant temperature does not reach to
specified temperature even though the engine has
run long enough.

쐌

Thermostat

쐌

Leakage from sealing portion of ther-
mostat

쐌

Engine coolant temperature sensor

DTC Confirmation Procedure

NHEC1291

NOTE:
If “DTC Confirmation Procedure” has been previously conducted,
always turn ignition switch “OFF” and wait at least 10 seconds
before conducting the next test.
TESTING CONDITION:

쐌

For best results, perform at ambient temperature of –10°C
(14°F) or higher.

쐌

For best results, perform at engine coolant temperature of
–10°C (14°F) to 60°C (140°F).

WITH CONSULT-II

NHEC1291S01

Replace thermostat with new one. Refer to LC-18, “Thermo-
stat”. Use only a genuine NISSAN thermostat as a replace-
ment. If an incorrect thermostat is used, the MIL may come on.

Turn ignition switch “ON”.

Select “COOLAN TEMP/S” in “DATA MONITOR” mode with
CONSULT-II.

Check that the “COOLAN TEMP/S” is above 60°C (140°F).
If it is below 60°C (140°F), go to following step.
If it is above 60°C (140°F), stop engine and cool down the
engine to less than 60°C (140°F), then retry from step 1.

Drive vehicle for 10 consecutive minutes under the following
conditions.

VHCL SPEED SE

80 - 120 km/h (50 - 75 MPH)

If 1st trip DTC is detected, go to “Diagnostic Procedure”,
EC-220.

WITH GST

NHEC1291S02

Follow the prodedure “WITH CONSULT-II” above.

IDX

DTC P0128 THERMOSTAT FUNCTION

On Board Diagnosis Logic

EC-219

Diagnostic Procedure

NHEC1292

CHECK ENGINE COOLANT TEMPERATURE SENSOR

1. Turn ignition switch OFF.
2. Remove engine coolant temperature sensor.
3. Check resistance between engine coolant temperature sensor terminals under the following conditions.

SEF304X

OK or NG

䊳

INSPECTION END

䊳

Replace engine coolant temperature sensor.

DTC P0128 THERMOSTAT FUNCTION

Diagnostic Procedure

EC-220

SEF463R

SEF288D

Component Description

NHEC0873

The heated oxygen sensor 1 is placed into the front tube. It detects
the amount of oxygen in the exhaust gas compared to the outside
air. The heated oxygen sensor 1 has a closed-end tube made of
ceramic zirconia. The zirconia generates voltage from approxi-
mately 1V in richer conditions to 0V in leaner conditions. The
heated oxygen sensor 1 signal is sent to the ECM. The ECM
adjusts the injection pulse duration to achieve the ideal air-fuel
ratio. The ideal air-fuel ratio occurs near the radical change from
1V to 0V.

CONSULT-II Reference Value in Data Monitor
Mode

NHEC0874

Specification data are reference values.

MONITOR ITEM

CONDITION

SPECIFICATION

HO2S1 (B1)
HO2S1 (B2)

쐌

Engine: After warming up

Maintaining engine speed at 2,000
rpm

0 - 0.3V

Approx. 0.6 - 1.0V

HO2S1 MNTR
(B1)
HO2S1 MNTR
(B2)

LEAN

RICH

Changes more than 5 times during
10 seconds.

SEF301UA

On Board Diagnosis Logic

NHEC0876

To judge the malfunction, the diagnosis checks that the heated
oxygen sensor 1 output is not inordinately high.

IDX

DTC P0132, P0152 HO2S1

Component Description

EC-221

DTC No.

Trouble diagnosis

name

DTC Detecting Condition

Possible Cause

P0132
0132
(Bank 1)
P0152
0152
(Bank 2)

Heated oxygen sen-
sor 1 circuit high volt-
age

An excessively high voltage from the sensor is
sent to ECM.

쐌

Harness or connectors
(The sensor circuit is open or
shorted.)

쐌

Heated oxygen sensor 1

SEF174Y

DTC Confirmation Procedure

NHEC0877

NOTE:
If “DTC Confirmation Procedure” has been previously conducted,
always turn ignition switch “OFF” and wait at least 10 seconds
before conducting the next test.

WITH CONSULT-II

NHEC0877S01

Start engine and warm it up to normal operating temperature.

Turn ignition switch “OFF” and wait at least 10 seconds.

Turn ignition switch “ON”.

Select “DATA MONITOR” mode with CONSULT-II.

Restart engine and let it idle for 25 seconds.

If 1st trip DTC is detected, go to “Diagnostic Procedure”,
EC-225.

WITH GST

NHEC0877S02

Start engine and warm it up to normal operating temperature.

Turn ignition switch “OFF” and wait at least 10 seconds.

Restart engine and let it idle for 25 seconds.

Turn ignition switch “OFF” and wait at least 10 seconds.

Restart engine and let it idle for 25 seconds.

Select “MODE 3” with GST.

If DTC is detected, go to “Diagnostic Procedure”, EC-225.

쐌

When using GST, “DTC Confirmation Procedure” should
be performed twice as much as when using CONSULT-II
because GST cannot display MODE 7 (1st trip DTC) con-
cerning this diagnosis. Therefore, using CONSULT-II is
recommended.

DTC P0132, P0152 HO2S1

On Board Diagnosis Logic (Cont’d)

EC-222

Wiring Diagram

NHEC0878

BANK 1

NHEC0878S01

MEC537D

SEC107D

IDX

DTC P0132, P0152 HO2S1

Wiring Diagram

EC-223

BANK 2

NHEC0878S02

MEC538D

SEC108D

DTC P0132, P0152 HO2S1

Wiring Diagram (Cont’d)

EC-224

Content .. 12 13 14 15 ..