Nissan Maxima. Manual - part 478

EC-396

< DTC/CIRCUIT DIAGNOSIS >

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P0643 SENSOR POWER SUPPLY

Is the inspection result normal?

YES

>> GO TO 9.

NO

>> GO TO 8.

8.

REPLACE ACCELERATOR PEDAL ASSEMBLY

1. Replace accelerator pedal assembly. Refer to 

ACC-3, "Removal and Installation"

.

2. Go to 

EC-469, "Special Repair Requirement"

.

>> INSPECTION END

9.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-41, "Intermittent Incident"

.

>> INSPECTION END

P0850 PNP SWITCH

EC-397

< DTC/CIRCUIT DIAGNOSIS >

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P0850 PNP SWITCH

Description

INFOID:0000000010095080

When the selector lever position is P or N, park/neutral position (PNP) signal from the TCM is sent to ECM.

DTC Logic

INFOID:0000000010095081

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

INSPECTION START

Will CONSULT be used?
Will CONSULT be used?

YES

>> GO TO 2.

NO

>> GO TO 5.

2.

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-

ing 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.

>> GO TO 3.

3.

CHECK PNP SIGNAL

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

>> Go to 

EC-398, "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.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0850

Park/neutral position 
switch

The park/neutral position (PNP) signal does not 
change during driving after the engine is start-
ed.

• Harness or connectors

(The sensor circuit is open or shorted.)

• TCM

Position (Selector lever)

Known-good signal

N or P position

ON

Except above position

OFF

ENG SPEED

1,100 - 6,375 rpm

COOLAN TEMP/S

More than 70

°C (158°F)

B/FUEL SCHDL

4.0 - 31.8 msec

EC-398

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

P0850 PNP SWITCH

4. Check 1st trip DTC.
Is 1st trip DTC detected?

YES

>> Go to 

EC-398, "Diagnosis Procedure"

.

NO

>> INSPECTION END

5.

PERFORM COMPONENT FUNCTION CHECK

Perform component function check. Refer to 

EC-398, "Component Function Check"

.

NOTE:

Use component function check to check the overall function of the park/neutral position (PNP) signal circuit.

During this check, a 1st trip DTC might not be confirmed.
Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Go to 

EC-398, "Diagnosis Procedure"

.

Component Function Check

INFOID:0000000010095082

Regarding Wiring Diagram information, refer to 

EC-554, "Wiring Diagram"

.

1.

PERFORM COMPONENT FUNCTION CHECK

1. Turn ignition switch ON.

2. Check the voltage between ECM harness connectors.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Go to 

EC-398, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000010095083

Regarding Wiring Diagram information, refer to 

EC-554, "Wiring Diagram"

.

1.

CHECK DTC WITH TCM

Refer to 

EC-542, "DTC Index"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace malfunctioning part.

2.

CHECK PNP SIGNAL CIRCUIT FOR OPEN AND SHORT-I

1. Turn ignition switch OFF.

2. Disconnect TCM harness connector.

3. Disconnect IPDM E/R harness connector.

4. Check the continuity between TCM harness connector and IPDM E/R harness connector.

5. Also check harness for short to ground and short to power.
Is the inspection result normal?

YES

>> GO TO 3.

VHCL SPEED SE

More than 64 km/h (40 mph)

Selector lever

Suitable position

ECM

Condition

Voltage

Connector

+

–

Terminal

Terminal

E10

102

112

Selector lever

P or N

Battery voltage

Except above

Approx. 0 V

JMBIA1874ZZ

TCM

IPDM E/R

Continuity

Connector

Terminal

Connector

Terminal

F15

20

F10

72

Existed

P0850 PNP SWITCH

EC-399

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

3.

CHECK PNP SIGNAL CIRCUIT FOR OPEN AND SHORT-II

1. Disconnect IPDM E/R harness connectors.

2. Disconnect ECM harness connector.

3. Check the continuity between ECM harness connector and IPDM E/R harness connector.

4. Also check harness for short to ground and short to power.
Is the inspection result normal?

YES

>> GO TO 5.

NO

>> GO TO 4.

4.

DETECT MALFUNCTIONING PART

Check the following.

• Junction block harness connectors E45, E50

• Harness for open or short between ECM and IPDM E/R

>> Repair or replace harness or connectors.

5.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-41, "Intermittent Incident"

.

Is the inspection result normal?

YES

>> Replace IPDM E/R. Refer to 

PCS-35, "Removal and Installation"

.

NO

>> Repair or replace malfunctioning part.

ECM

IPDM E/R

Continuity

Connector

Terminal

Connector

Terminal

E10

102

E18

30

Existed