Nissan Qashqai (2007-2010). Manual - part 383

ON BOARD DIAGNOSTIC (OBD) SYSTEM

EC-1051

< FUNCTION DIAGNOSIS >

[MR20DE (WITHOUT EURO-OBD)]

• Freeze frame data
• 1st trip freeze frame data
• Test values

How to Switch Diagnostic Test Mode

NOTE:
• It is better to count the time accurately with a clock.
• It is impossible to switch the diagnostic mode when an accelerator pedal position sensor circuit has

a malfunction.

• Always ECM returns to Diagnostic Test Mode I after ignition switch is turned OFF.
HOW to SET DIAGNOSTIC TEST MODE II (SELF-DIAGNOSTIC RESULTS)
1.

Confirm that accelerator pedal is fully released, turn ignition switch ON and wait 3 seconds.

Repeat the following procedure quickly five times within 5 seconds.

Fully depress the accelerator pedal.

Fully release the accelerator pedal.

Wait 7 seconds, fully depress the accelerator pedal and keep it for approx. 10 seconds until the MI starts
blinking.

Fully release the accelerator pedal.
ECM has entered to Diagnostic Test Mode II (Self-diagnostic results).
NOTE:
Wait until the same DTC (or 1st trip DTC) appears to confirm all DTCs certainly.

HOW to SET DIAGNOSTIC TEST MODE II (HEATED OXYGEN SENSOR 1 MONITOR)
1.

Set the ECM in Diagnostic Test Mode II (Self-diagnostic results).
Refer to “HOW to SET DIAGNOSTIC TEST MODE II (SELF-DIAGNOSTIC RESULTS)”.

Start Engine.
ECM has entered to Diagnostic Test Mode II (Heated oxygen sensor 1 monitor).

HOW to ERASE DIAGNOSTIC TEST MODE II (SELF-DIAGNOSTIC RESULTS)
1.

Set ECM in Diagnostic Test Mode II (Self-diagnostic results). Refer to “HOW to SET DIAGNOSTIC TEST
MODE II (SELF-DIAGNOSTIC RESULTS)”.

Fully depress the accelerator pedal and keep it for more than 10 seconds.
The emission-related diagnostic information has been erased from the backup memory in the ECM.

Fully release the accelerator pedal, and confirm the DTC 0000 is displayed.

CONSULT-III Function

INFOID:0000000001094083

FUNCTION

PBIB0092E

Diagnostic test mode

Function

Work support

This mode enables a technician to adjust some devices faster and more accurately by following the in-
dications on the CONSULT-III unit.

Self-diagnostic results

Self-diagnostic results such as 1st trip DTC, DTCs and 1st trip freeze frame data or freeze frame data
can be read and erased quickly.*

Data monitor

Input/Output data in the ECM can be read.

Active test

Diagnostic Test Mode in which CONSULT-III drives some actuators apart from the ECMs and also shifts
some parameters in a specified range.

Function test

This mode is used to inform customers when their vehicle condition requires periodic maintenance.

ECU part number

ECM part number can be read.

EC-1052

< FUNCTION DIAGNOSIS >

[MR20DE (WITHOUT EURO-OBD)]

ON BOARD DIAGNOSTIC (OBD) SYSTEM

*: The following emission-related diagnostic information is cleared when the ECM memory is erased.

• Diagnostic trouble codes

• 1st trip diagnostic trouble codes

• Freeze frame data

• 1st trip freeze frame data

• Test values

ENGINE CONTROL COMPONENT PARTS/CONTROL SYSTEMS APPLICATION

X: Applicable

Item

DIAGNOSTIC TEST MODE

WORK

SUPPORT

SELF-DIAGNOSTIC RE-

SULTS

DATA

MONI-

TOR

DATA

MONI-

TOR

(SPEC)

ACTIVE

TEST

DTC*

FREEZE

FRAME DA-

TA*

ENGINE CONTROL COMP

ENT P

RTS

INPUT

Crankshaft position sensor (POS)

Camshaft position sensor (PHASE)

Mass air flow sensor

Engine coolant temperature sensor

Heated oxygen sensor 1

Heated oxygen sensor 2

Wheel sensor

Accelerator pedal position sensor

Throttle position sensor

Intake air temperature sensor

Knock sensor

EPS control unit

Refrigerant pressure sensor

Closed throttle position switch (accelerator
pedal position sensor signal)

Air conditioner switch

Park/neutral position (PNP) switch

Stop lamp switch

Battery voltage

Load signal

ENGINE CONTROL COMPONENT P

ARTS

TPUT

Fuel injector

Power transistor (Ignition timing)

Throttle control motor relay

Throttle control motor

EVAP canister purge volume control sole-
noid valve

Air conditioner relay

Fuel pump relay

Cooling fan relay

Heated oxygen sensor 1 heater

Heated oxygen sensor 2 heater

Intake valve timing control solenoid valve

Calculated load value

ON BOARD DIAGNOSTIC (OBD) SYSTEM

EC-1053

< FUNCTION DIAGNOSIS >

[MR20DE (WITHOUT EURO-OBD)]

*1: This item includes 1st trip DTCs.

*2: This mode includes 1st trip freeze frame data or freeze frame data. The items appear on CONSULT-II screen in freeze frame data
mode only if a 1st trip DTC or DTC is detected. For details, refer to

EC-1050, "Diagnosis Description"

WORK SUPPORT MODE

Work Item

*: This function is not necessary in the usual service procedure.

SELF-DIAG RESULTS MODE

Self Diagnostic Item

Regarding items of DTC and 1st trip DTC, refer to

EC-1241, "DTC Index"

Freeze Frame Data and 1st Trip Freeze Frame Data

*: The items are the same as those of 1st trip freeze frame data.

WORK ITEM

CONDITION

USAGE

FUEL PRESSURE RELEASE

• FUEL PUMP WILL STOP BY TOUCHING “START” DUR-

ING IDLING.
CRANK A FEW TIMES AFTER ENGINE STALLS.

When releasing fuel pressure from
fuel line

IDLE AIR VOL LEARN

• THE IDLE AIR VOLUME THAT KEEPS THE ENGINE

WITHIN THE SPECIFIED RANGE IS MEMORIZED IN
ECM.

When learning the idle air volume

SELF-LEARNING CONT

• THE COEFFICIENT OF SELF-LEARNING CONTROL

MIXTURE RATIO RETURNS TO THE ORIGINAL COEF-
FICIENT.

When clearing mixture ratio self-
learning value

TARGET IDLE RPM ADJ*

• IDLE CONDITION

When setting target idle speed

TARGET IGN TIM ADJ*

• IDLE CONDITION

When adjusting target ignition tim-
ing

Freeze frame data

item*

Description

DIAG TROUBLE
CODE
[PXXXX]

• The engine control component part/control system has a trouble code, it is displayed as PXXXX. (Refer to

EC-1241, "DTC Index"

FUEL SYS-B1

• “Fuel injection system status” at the moment a malfunction is detected is displayed.
• One mode in the following is displayed.

Mode2: Open loop due to detected system malfunction
Mode3: Open loop due to driving conditions (power enrichment, deceleration enleanment)
Mode4: Closed loop - using oxygen sensor(s) as feedback for fuel control
Mode5: Open loop - has not yet satisfied condition to go to closed loop

COOLANT TEMP [

or [

• The engine coolant temperature at the moment a malfunction is detected is displayed.

L-FUEL TRM-B1 [%]

• “Long-term fuel trim” at the moment a malfunction is detected is displayed.
• The long-term fuel trim indicates much more gradual feedback compensation to the base fuel schedule than

short-term fuel trim.

S-FUEL TRM-B1 [%]

• “Short-term fuel trim” at the moment a malfunction is detected is displayed.
• The short-term fuel trim indicates dynamic or instantaneous feedback compensation to the base fuel sched-

ule.

ENGINE SPEED [rpm]

• The engine speed at the moment a malfunction is detected is displayed.

VEHICL SPEED
[km/h] or [mph]

• The vehicle speed at the moment a malfunction is detected is displayed.

ABSOL TH·P/S [%]

• The throttle valve opening angle at the moment a malfunction is detected is displayed.

B/FUEL SCHDL
[msec]

• The base fuel schedule at the moment a malfunction is detected is displayed.

INT/A TEMP SE [

or [

• The intake air temperature at the moment a malfunction is detected is displayed.

EC-1054

< FUNCTION DIAGNOSIS >

[MR20DE (WITHOUT EURO-OBD)]

ON BOARD DIAGNOSTIC (OBD) SYSTEM

DATA MONITOR MODE

Monitored Item

: Applicable

Monitored item

Unit

Description

Remarks

ENG SPEED

rpm

• Indicates the engine speed computed from the

signal of the crankshaft position sensor (POS)
and camshaft position sensor (PHASE).

• Accuracy becomes poor if engine

speed drops below the idle rpm.

• If the signal is interrupted while the

engine is running, an abnormal value
may be indicated.

MAS A/F SE-B1

• The signal voltage of the mass air flow sensor is

displayed.

• When the engine is stopped, a certain

value is indicated.

• When engine is running specification

range is indicated in “SPEC”.

B/FUEL SCHDL

msec

• “Base fuel schedule” indicates the fuel injection

pulse width programmed into ECM, prior to any
learned on board correction.

• When engine is running specification

range is indicated in “SPEC”.

A/F ALPHA-B1

• The mean value of the air-fuel ratio feedback cor-

rection factor per cycle is indicated.

• When the engine is stopped, a certain

value is indicated.

• When engine is running specification

range is indicated in “SPEC”.

• This data also includes the data for

the air-fuel ratio learning control.

COOLAN TEMP/S

C or

• The engine coolant temperature (determined by

the signal voltage of the engine coolant tempera-
ture sensor) is displayed.

• When the engine coolant temperature

sensor is open or short-circuited,
ECM enters fail-safe mode. The en-
gine coolant temperature determined
by the ECM is displayed.

H02S1 (B1)

• The signal voltage of the heated oxygen sensor 1

is displayed.

HO2S2 (B1)

• The signal voltage of the heated oxygen sensor 2

is displayed.

HO2S1 MNTR (B1)

RICH/LEAN

• Display of heated oxygen sensor 1 signal during

air-fuel ratio feedback control:
RICH: means the mixture became “rich”, and
control is being affected toward a leaner mixture.
LEAN: means the mixture became “lean”, and
control is being affected toward a rich mixture.

• After turning ON the ignition switch,

“RICH” is displayed until air-fuel mix-
ture ratio feedback control begins.

• When the air-fuel ratio feedback is

clamped, the value just before the
clamping is displayed continuously.

HO2S2 MNTR(B1)

RICH/LEAN

• Display of heated oxygen sensor 2 signal:

RICH: means the amount of oxygen after three
way catalyst is relatively small.
LEAN: means the amount of oxygen after three
way catalyst is relatively large.

• When the engine is stopped, a certain

value is indicated.

VHCL SPEED SE

km/h or mph

• The vehicle speed computed from the vehicle

speed signal sent from combination meter is dis-
played.

BATTERY VOLT

• The power supply voltage of ECM is displayed.

ACCEL SEN 1

• The accelerator pedal position sensor signal volt-

age is displayed.

• ACCEL SEN 2 signal is converted by

ECM internally. Thus, it differs from
ECM terminal voltage signal.

ACCEL SEN 2

THRTL SEN 1-B1

• The throttle position sensor signal voltage is dis-

played.

• THRTL SEN 2-B1 signal is converted

by ECM internally. Thus, it differs from
ECM terminal voltage signal.

THRTL SEN 2-B1

START SIGNAL

ON/OFF

• Indicates start signal status [ON/OFF] computed

by the ECM according to the signals of engine
speed and battery voltage.

• After starting the engine, [OFF] is dis-

played regardless of the starter sig-
nal.

CLSD THL POS

ON/OFF

• Indicates idle position [ON/OFF] computed by

ECM according to the accelerator pedal position
sensor signal.

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