Nissan Altima (L32) 2007-2012 Service Manual: P0850 PNP Switch

Description

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

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 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.

>> GO TO 3.

3.CHECK PNP SIGNAL

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” signal 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.

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

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

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.

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.

4. Also check harness for short to ground and short to power.

Is the inspection result normal? YES >> GO TO 9.

NO >> GO TO 8.

8.DETECT MALFUNCTIONING PART

Check the following.

• Harness connectors E3, F1

• Harness for open or short between PNP switch and ECM

>> Repair or replace harness or connectors.

9.CHECK PNP SWITCH

Refer to TM-20, "Inspection".

Is the inspection result normal? YES >> GO TO 10 NO >> Replace PNP switch.

10.CHECK INTERMITTENT INCIDENT

Refer to GI-42, "Intermittent Incident".

Is the inspection result normal? YES >> Replace IPDM E/R.

NO >> Repair or replace malfunctioning part.