Nissan X-Trail 32. Manual - part 842

DIAGNOSIS SYSTEM (ECM)

EC-497

< SYSTEM DESCRIPTION >

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EC

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P/N POSI SW

On/Off

×

×

• Indicates [ON/OFF] condition from the 

park/neutral position (PNP) signal.

INT/A TEMP SE

°

C or 

°

F

×

×

• The intake air temperature (determined 

by the signal voltage of the intake air tem-
perature sensor) is indicated.

AC PRESS SEN

V

• The signal voltage from the refrigerant 

pressure sensor is displayed.

VTC DTY EX B1

%

• The control value of the exhaust valve 

timing control solenoid valve (determined 
by ECM according to the input signals) is 
indicated.

• The advance angle becomes larger as 

the value increases.

EOP SENSOR

mV

• The signal voltage of engine oil pressure 

sensor is displayed.

EVAP LEAK DIAG

YET/CMPLT

• Indicates the condition of EVAP leak di-

agnosis.
YET: EVAP leak diagnosis has not been 
performed yet.
CMPLT: EVAP leak diagnosis has been 
performed successfully.

EVAP DIAG 
READY

ON/OFF

• Indicates the ready condition of EVAP 

leak diagnosis.
ON: Diagnosis has been ready condition.
OFF: Diagnosis has not been ready con-
dition.

THRTL STK CNT 

B1

*

—

—

A/F SEN1 
DIAG1(B1)

INCMP/CM-

PLT

• Indicates DTC P015A or P015B self-di-

agnosis condition.

- INCMP: Self-diagnosis is incomplete.
- CMPLT: Self-diagnosis is complete.

A/F SEN1 
DIAG2(B1)

INCMP/CM-

PLT

• Indicates DTC P014C or P014D self-di-

agnosis condition.

- INCMP: Self-diagnosis is incomplete.
- CMPLT: Self-diagnosis is complete.

A/F SEN1 
DIAG3(B1)

ABSNT/

PRSNT

• Indicates DTC P014C, P014D, P015A or 

P015B self-diagnosis condition.

- ABSNT: The vehicle condition is not with-

in the diagnosis range.

- PRSNT: The vehicle condition is within 

the diagnosis range.

HO2 S2 DIAG1 
(B1)

INCMP/CM-

PLT

• Indicates DTC P0139 self-diagnosis (de-

layed response) condition.

- INCMP: Self-diagnosis is incomplete.
- CMPLT: Self-diagnosis is complete.

HO2 S2 DIAG2 
(B1)

INCMP/CM-

PLT

• Indicates DTC P0139 self-diagnosis 

(slow response) condition.

- INCMP: Self-diagnosis is incomplete.
- CMPLT: Self-diagnosis is complete.

Monitored item

Unit

Monitor Item 

Selection

Description

Remarks

ECU 

IN-

PUT 
SIG-

NALS

MAIN 

SIG-

NAL

S

EC-498

< SYSTEM DESCRIPTION >

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DIAGNOSIS SYSTEM (ECM)

*: The item is indicated, but not used.
NOTE:
Any monitored item that does not match the vehicle being diagnosed is deleted from the display automatically.

WORK SUPPORT MODE

Work Item

SYSTEM 1 DIAG-
NOSIS A B1

INCMP/CM-

PLT

• Indicates DTC P117A self-diagnosis con-

dition.

- INCMP: Self-diagnosis is incomplete.
- CMPLT: Self-diagnosis is complete.

SYSTEM 1 DIAG-
NOSIS B B1

ABSNT/

PRSNT

• Indicates DTC P117A self-diagnosis con-

dition.

- ABSNT: Self-diagnosis standby
- PRSNT: Under self-diagnosis

MASS AIR FLOW 
SENSOR (Hz)

Hz

• The signal frequency of the mass air flow 

sensor is displayed.

• When the engine is stopped, a 

certain value is indicated.

• When engine is running, spec-

ification range is indicated in 
“SPEC”.

A/F-S ATMSPHRC 
CRCT B1

—

Displays a determined value of atmospher-
ic correction factor necessary for correcting 
an A/F sensor signal input to ECM. The sig-
nal used for the correction is an A/F sensor 
signal transmitted while driving under atmo-
spheric pressure.

A/F-S ATMSPHRC 
CRCT UP B1

count

Displays the number of updates of the A/F 
sensor atmospheric correction factor.

Monitored item

Unit

Monitor Item 

Selection

Description

Remarks

ECU 

IN-

PUT 
SIG-

NALS

MAIN 

SIG-

NAL

S

Work item

Condition

Usage

IDLE AIR VOL LEARN

• The idle air volume that keeps the engine within the spec-

ified range is memorized in ECM.

When learning the idle air volume

EVAP SYSTEM CLOSE

Close the EVAP canister vent control valve in order to make 
EVAP system close under the following conditions.
• Ignition switch ON
• Engine not running
• Ambient temperature is above 0

°

C (32

°

F).

• No vacuum and no high pressure in EVAP system
• Fuel tank temp is more than 0

°

C (32

°

F).

• Within 10 minutes after starting “EVAP SYSTEM CLOSE”
• When trying to execute “EVAP SYSTEM CLOSE” under 

the condition except above, CONSULT will discontinue it 
and display appropriate instruction.
NOTE:
When starting engine, CONSULT may display “BAT-
TERY VOLTAGE IS LOW. CHARGE BATTERY”, even in 
when using a charged battery.

When detecting EVAP vapor leak 
in the EVAP system

FUEL PRESSURE RELEASE

• Fuel pump will stop by touching “START” during idling.

Crank a few times after engine stalls.

When releasing fuel pressure from 
fuel line

TARGET IGN TIM ADJ*

• Idle condition

When adjusting target ignition tim-
ing

TARGET IDLE RPM ADJ*

• Idle condition

When setting target idle speed

VIN REGISTRATION

• In this mode, VIN is registered in ECM.

When registering VIN in ECM

DIAGNOSIS SYSTEM (ECM)

EC-499

< SYSTEM DESCRIPTION >

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

ACTIVE TEST MODE

Test Item

SELF-LEARNING CONT

• The coefficient of self-learning control mixture ratio returns 

to the original coefficient.

When clearing mixture ratio self-
learning value

CLSD THL POS LEARN

• Ignition on and engine stopped.

When learning the throttle valve 
closed position

SAVING DATA FOR REPLC CPU

In this mode, save data that is in ECM.

When ECM is replaced.

WRITING DATA FOR REPLC CPU

In this mode, write data stored by “SAVE DATA FOR CPU 
REPLC” in work support mode to ECM.

When ECM is replaced.

Work item

Condition

Usage

Test item

Condition

Judgment

Check item (Remedy)

FUEL INJECTION

• Engine: Return to the original 

trouble condition

• Change the amount of fuel injec-

tion using CONSULT.

If trouble symptom disappears, see 
CHECK ITEM.

• Harness and connectors
• Fuel injector
• Air fuel ratio (A/F) sensor 1

ENG COOLANT 
TEMP

• Engine: Return to the original 

trouble condition

• Change the engine coolant tem-

perature using CONSULT.

If trouble symptom disappears, see 
CHECK ITEM.

• Harness and connectors
• Engine coolant temperature 

sensor

• Fuel injector

PURG VOL CONT/V

• Engine: After warming up, run en-

gine at 1,500 rpm.

• Change the EVAP canister purge 

volume control solenoid valve 
opening percent using CON-
SULT.

Engine speed changes according 
to the opening percent.

• Harness and connectors
• Solenoid valve

FUEL/T TEMP SEN

• Change the fuel tank temperature using CONSULT.

FUEL PUMP RELAY

• Ignition switch: ON (Engine 

stopped)

• Turn the fuel pump relay “ON” 

and “OFF” using CONSULT and 
listen to operating sound.

Fuel pump relay makes the operat-
ing sound.

• Harness and connectors
• Fuel  pump  relay

TUMBLE CONTROL 
VALVE

• Ignition switch: ON
• Turn intake manifold runner con-

trol valve “ON” and “OFF” using 
CONSULT and listen to operating 
sound.

Intake Manifold Runner control 
valve motor makes an operating 
sound.

• Harness and connectors
• Intake Manifold Runner control 

valve motor

IGNITION TIMING

• Engine: Return to the original 

trouble condition

• Timing light: Set
• Retard the ignition timing using 

CONSULT.

If trouble symptom disappears, see 
CHECK ITEM.

• Perform Idle Air Volume Learn-

ing.

POWER BALANCE

• Engine: After warming up, idle the 

engine.

• A/C switch OFF
• Selector lever: P or N
• Cut off each fuel injector signal 

one at a time using CONSULT.

Engine runs rough or stops.

• Harness and connectors
• Compression
• Fuel injector
• Power transistor
• Spark  plug
• Ignition  coil

VENT CONTROL/V

• Ignition switch: ON (Engine 

stopped)

• Turn solenoid valve “ON” and 

“OFF” using CONSULT and listen 
to operating sound.

Solenoid valve makes an operating 
sound.

• Harness and connectors
• Solenoid valve

EC-500

< SYSTEM DESCRIPTION >

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DIAGNOSIS SYSTEM (ECM)

DTC WORK SUPPORT MODE

Test Item

SRT & P-DTC MODE

SRT STATUS Mode

For items whose SRT codes are set, “CMPLT” is displayed on the CONSULT screen; for items whose SRT
codes are not set, “INCMP” is displayed.

SRT WORK SUPPORT Mode

This mode enables a technician to drive a vehicle to set the SRT while monitoring the SRT status.

INT V/T ASSIGN AN-
GLE

• Engine: Return to the original 

trouble condition

• Change intake valve timing using 

CONSULT.

If trouble symptom disappears, see 
CHECK ITEM.

• Harness and connectors
• Intake valve timing control sole-

noid valve

EXH V/T ASSIGN 
ANGLE

• Engine: Return to the original 

trouble condition

• Change exhaust valve timing us-

ing CONSULT.

If trouble symptom disappears, see 
CHECK ITEM.

• Harness and connectors
• Exhaust valve timing control so-

lenoid valve

Test item

Condition

Judgment

Check item (Remedy)

Test mode

Test item

Corresponding DTC No.

Reference page

A/F SEN1

A/F SEN1(B1) P1276

P0130

EC-618

HO2S2

HO2S2(B1) P1146

P0138

EC-634

HO2S2(B1) P1147

P0137

EC-628