Nissan Qashqai J11. Manual - part 332

P062B ECM

ECM-305

< DTC/CIRCUIT DIAGNOSIS >

[MR20DD]

C

D

E

F

G

H

I

J

K

L

M

A

ECM

N

P

O

YES

>> GO TO 2.

NO

>> Repair or replace error-detected parts.

2.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Turn ignition switch ON.

2.

Erase DTC.

3.

Perform DTC confirmation procedure again. Refer to 

ECM-304, "DTC Logic"

.

4.

Check 1st trip DTC.

Is the DTC P062B displayed again?

YES

>> Replace ECM. Refer to 

ECM-416, "Removal and Installation"

.

NO

>> INSPECTION END

ECM-306

< DTC/CIRCUIT DIAGNOSIS >

[MR20DD]

P0643 SENSOR POWER SUPPLY

P0643 SENSOR POWER SUPPLY

DTC Description

INFOID:0000000010702999

ECM supplies a voltage of 5 V to some of the sensors systematically divided into 2 groups, respectively.
Accordingly, when a short circuit develops in a sensor power source, a malfunction may occur simultaneously
in the sensors belonging to the same group as the short-circuited sensor.

Sensor power supply 1

• CKP sensor (POS)
• APP sensor 1
• Exhaust valve timing control position sensor
• Electric throttle control actuator
NOTE:
If sensor power supply 1 circuit is malfunctioning, DTC P0643 is displayed.

Sensor power supply 2

• Barometric pressure sensor
• Refrigerant pressure sensor
• Fuel rail pressure sensor
• CMP sensor
• APP sensor 2
• Engine oil pressure sensor

DTC DETECTION LOGIC

POSSIBLE CAUSE

• Harness or connectors
- APP sensor 1 circuit is shorted.
- CKP sensor (POS) circuit is shorted.
- Intake manifold runner control valve position sensor circuit is shorted.
- TP sensor circuit is shorted.
- Refrigerant pressure sensor circuit is shorted.
• Accelerator pedal position sensor
• CKP sensor (POS)
• Intake manifold runner control valve position sensor
• Throttle position sensor
• Refrigerant pressure sensor

FAIL-SAFE

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following procedure
before conducting the next test.
1.

Turn ignition switch OFF and wait at least 10 seconds.

2.

Turn ignition switch ON.

3.

Turn ignition switch OFF and wait at least 10 seconds.

TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 8 V at idle.

DTC No.

CONSULT screen terms

(Trouble diagnosis content)

DTC detecting condition

P0643

SENSOR POWER/CIRC
(Sensor reference voltage “A” circuit high)

ECM detects that the voltage of sensor power supply 1 is excessively low 
or high.

Engine operating condition in fail-safe mode

Fail safe mode

Vehicle behavior

Others

ECM stops the electric throttle control actuator control, throttle valve is maintained at a fixed 
opening (approx. 5 degrees) by the return spring.

P0643 SENSOR POWER SUPPLY

ECM-307

< DTC/CIRCUIT DIAGNOSIS >

[MR20DD]

C

D

E

F

G

H

I

J

K

L

M

A

ECM

N

P

O

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Start engine and let it idle for 1 second.

2.

Check DTC.

Is DTC detected?

YES

>> Proceed to 

ECM-307, "Diagnosis Procedure"

.

NO-1

>> To check malfunction symptom before repair: Refer to 

GI-41, "Intermittent Incident"

.

NO-2

>> Confirmation after repair: INSPECTION END

Diagnosis Procedure

INFOID:0000000010703000

1.

CHECK ACCELERATOR PEDAL POSITION SENSOR 1 POWER SUPPLY CIRCUIT

1.

Disconnect accelerator pedal position (APP) sensor harness connector.

2.

Turn ignition switch ON.

3.

Check the voltage between APP sensor harness connector and ground.

Is the inspection result normal?

YES

>> Proceed to 

ECM-359, "Component Inspection"

.

NO

>> GO TO 2.

2.

CHECK SENSOR POWER SUPPLY CIRCUITS

Check harness for short to power and short to ground, between the following terminals.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace malfunctioning part.

3.

CHECK COMPONENTS

Check the following.
• Exhaust valve timing control position sensor (Refer to 

ECM-315, "Component Inspection"

)

• Crankshaft position sensor (Refer to 

ECM-261, "Component Inspection"

)

• Throttle position sensor (Refer to 

ECM-196, "Component Inspection"

)

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Repair or replace malfunctioning part.

+

−

Voltage

(Approx.)

APP sensor

Connector

Terminal

E20

4

Ground

5 V

ECM

Sensor

Connector

Terminal

Name

Connector

Terminal

F15

21

Crankshaft position sensor

F85

1

24

Exhaust valve timing control position sensor

F36

1

F16

60

Throttle position sensor

F45

2

E57

122

APP sensor 1

E20

4

ECM-308

< DTC/CIRCUIT DIAGNOSIS >

[MR20DD]

P0850 REVERSE/NEUTRAL POSITION SWITCH

P0850 REVERSE/NEUTRAL POSITION SWITCH

CVT

CVT : DTC Description

INFOID:0000000010703001

Transmission range switch is turn ON when the selector lever is P or N.
ECM detects the position because the continuity of the line (the ON) exists.

DTC DETECTION LOGIC

POSSIBLE CAUSE

• Harness or connectors (Park/neutral position signal circuit is open or shorted.)
• Transmission range switch

FAIL-SAFE

Not applicable

DTC CONFIRMATION PROCEDURE

1.

INSPECTION START

Do you have CONSULT?

Do you have CONSULT?

YES

>> GO TO 2.

NO

>> GO TO 5.

2.

PRECONDITIONING

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

>> GO TO 3.

3.

CHECK PNP SIGNAL FUNCTION

With CONSULT

1.

Turn ignition switch ON.

2.

Select “P/N POSI SW” in “DATA MONITOR” mode with CONSULT. Then check the “P/N POSI SW” signal
under the following conditions.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Proceed to 

ECM-309, "CVT : Diagnosis Procedure"

.

4.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Select “DATA MONITOR” mode with CONSULT.

2.

Start engine and warm it up to normal operating temperature.

3.

Maintain the following conditions for at least 50 consecutive seconds.

CAUTION:

Always drive vehicle at a safe speed.

DTC No.

CONSULT screen terms

(Trouble diagnosis content)

DTC detecting condition

P0850

P-N POS SW/CIRCUIT
(Park/neutral switch input circuit)

The signal of transmission range switch is not changed in the process of 
engine starting and driving.

Position (Shift lever)

Known-good signal

N or P position

ON

Except above position

OFF