Nissan Altima L32. Manual - part 565

P0643 SENSOR POWER SUPPLY

EC-1381

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1. Replace accelerator pedal assembly.

2. Go to 

EC-1450, "Special Repair Requirement"

.

>> INSPECTION END

9.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-42, "Intermittent Incident"

.

>> INSPECTION END

EC-1382

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[VQ35DE]

P0850 PNP SWITCH

P0850 PNP SWITCH

Description

INFOID:0000000004362227

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

(CVT models).

When the selector lever position is Neutral position, park/neutral position (PNP) switch is ON. ECM detects the

position because the continuity of the line (the ON signal) exists (M/T models).

DTC Logic

INFOID:0000000004362228

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

INSPECTION START

Will CONSULT-III be used?
Will CONSULT-III 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-III

1. Turn ignition switch ON.

2. Select “P/N POSI SW” in “DATA MONITOR” mode with CONSULT-III. Then check the “P/N POSI SW” sig-

nal under the following conditions.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Go to 

EC-1383, "Diagnosis Procedure"

.

4.

PERFORM DTC CONFIRMATION PROCEDURE

1. Select “DATA MONITOR” mode with CONSULT-III.

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 signal of the park/neutral position (PNP) 
signal does not change during driving after the 
engine is started.

• Harness or connectors

(The sensor circuit is open or shorted.)

• Park/neutral position (PNP) switch (M/T 

models)

• TCM  (CVT  models)

Position (Selector lever)

Known-good signal

N or P position (CVT)
Neutral position (M/T)

ON

Except above position

OFF

P0850 PNP SWITCH

EC-1383

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

YES

>> Go to 

EC-1383, "Diagnosis Procedure"

.

NO

>> INSPECTION END

5.

PERFORM COMPONENT FUNCTION CHECK

Perform component function check. Refer to 

EC-1383, "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-1383, "Diagnosis Procedure"

.

Component Function Check

INFOID:0000000004362229

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-1383, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000004362230

1.

INSPECTION START

Check the transmission type of the vehicle.
Which type of transmission is the vehicle equipped?

CVT

>> GO TO 2.

M/T

>> GO TO 5.

2.

CHECK DTC WITH TCM

Refer to 

EC-1555, "DTC Index"

.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace malfunctioning part.

3.

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.

ENG SPEED

1,100 - 6,375 rpm

COOLAN TEMP/S

More than 70

°C (158°F)

B/FUEL SCHDL

4.0 - 31.8 msec

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 

position

P or N (CVT)

Neutral (M/T)

Battery voltage

Except above

Approx. 0 V

JMBIA1874ZZ

EC-1384

< COMPONENT DIAGNOSIS >

[VQ35DE]

P0850 PNP SWITCH

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 4.

NO

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

4.

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 10.

NO

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

5.

CHECK PNP SWITCH POWER SUPPLY CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect park/neutral position (PNP) switch harness connector.

3. Turn ignition switch ON.

4. Check the voltage between PNP switch harness connector and

ground.

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> GO TO 6.

6.

DETECT MALFUNCTIONING PART

Check the following.

• 10 A fuse (No. 33)

• IPDM E/R harness connector F10

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

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

7.

CHECK PNP SIGNAL CIRCUIT FOR OPEN AND SHORT

1. Turn ignition switch OFF.

2. Disconnect ECM harness connector.

3. Check the continuity between PNP switch harness connector and ECM harness connector.

TCM

IPDM E/R

Continuity

Connector

Terminal

Connector

Terminal

F15

20

F10

72

Existed

ECM

IPDM E/R

Continuity

Connector

Terminal

Connector

Terminal

E10

102

E18

30

Existed

PNP switch

Ground

Voltage (V)

Connector

Terminal

F32

1

Ground

Battery voltage

PBIB3623E

PNP switch

ECM

Continuity

Connector

Terminal

Connector

Terminal

F32

2

E10

102

Existed