Nissan Sentra manuals

Nissan Sentra Service Manual: P0850 PNP Switch

Description

For CVT models, transmission range switch is turn ON when the selector lever is P or N.

For M/T models, park/neutral position (PNP) range switch is ON when the selector lever is Neutral position.

ECM detects the position because the continuity of the line (the ON) exists.

DTC Logic

DTC DETECTION LOGIC

DTC No.

CONSULT screen terms (Trouble diagnosis content)

DTC detecting condition

Possible cause

P0850 P-N POS SW/CIRCUIT (Park/Neutral switch input circuit)
  • For CVT models, the signal of transmission range switch is not changed in the process of engine starting and driving.
  • For M/T models, the signal of the park/ neutral position (PNP) switch is not changed in the process of engine starting and driving.
  • Harness or connectors [Transmission range switch circuit is open or shorted. (CVT models)] [Park/neutral position (PNP) switch circuit is open or shorted. (M/T models)]
  • Transmission range switch (CVT models)
  • Park/neutral position (PNP) switch (M/T models)

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.

>> GO TO 2.

2.PERFORM COMPONENT FUNCTION CHECK

Perform component function check. Refer to EC-356, "Component Function Check".

Is the inspection result normal? YES >> GO TO 3.

NO >> Proceed to EC-356, "Diagnosis Procedure".

3.PERFORM DTC CONFIRMATION PROCEDURE

With CONSULT


  1. Select “DATA MONITOR” mode of “ENGINE” using CONSULT.
  2. Start engine and warm it up to normal operating temperature.
  3. Maintain the following conditions for at least 60 consecutive seconds.

CAUTION:

Always drive vehicle at a safe speed.


  1. Check 1st trip DTC.

Follow the procedure “With CONSULT” above. With GST


Follow the procedure “With CONSULT” above.

Is 1st trip DTC detected? YES >> Proceed to EC-356, "Diagnosis Procedure".

NO >> INSPECTION END

Component Function Check

1.CHECK PNP SIGNAL FUNCTION

With CONSULT


  1. Turn ignition switch ON.
  2. Select “P/N POSI SW” in “DATA MONITOR” mode of “ENGINE” using CONSULT. Then check the “P/N POSI SW” signal as per the following conditions.

Is the inspection result normal?


Is the inspection result normal? YES >> GO TO 2.

NO >> Proceed to EC-356, "Diagnosis Procedure".

2.PERFORM COMPONENT FUNCTION CHECK

  1. Turn ignition switch ON.
  2. Check the voltage between ECM harness connector and ground as per the following conditions.

Is the inspection result normal?


Is the inspection result normal? YES >> INSPECTION END

NO >> Proceed to EC-356, "Diagnosis Procedure".

Diagnosis Procedure

1.INSPECTION START

Check which type of transmission the vehicle is equipped with.

Which type of transmission? CVT models>>GO TO 2.

M/T models>>GO TO 6.

2.CHECK TRANSMISSION RANGE SWITCH POWER SUPPLY

  1. Turn ignition switch OFF.
  2. Disconnect transmission range switch harness connector.
  3. Turn ignition switch ON.
  4. Check the voltage between transmission range switch harness connector and ground.

Is the inspection result normal?


Is the inspection result normal? YES >> GO TO 4.

NO >> GO TO 3.

3.CHECK TRANSMISSION RANGE SWITCH POWER SUPPLY CIRCUIT

  1. Turn ignition switch OFF.
  2. Disconnect IPDM E/R harness connector.
  3. Check the continuity between transmission range switch harness connector and IPDM E/R harness connector.


  1. Also check harness for short to ground.

Is the inspection result normal? YES >> Perform the trouble diagnosis for power supply circuit.

NO >> Repair or replace error-detected parts.

4.CHECK TRANSMISSION RANGE SWITCH SIGNAL CIRCUIT

  1. Turn ignition switch OFF.
  2. Disconnect ECM harness connector.
  3. Check the continuity between transmission range switch harness connector and ECM harness connector.


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

Is the inspection result normal? YES >> GO TO 5.

NO >> Repair or replace error-detected parts.

5.CHECK TRANSMISSION RANGE SWITCH

Check the transmission range switch. Refer to TM-165, "Component Inspection".

Is the inspection result normal? YES >> Check intermittent incident. Refer to GI-39, "Intermittent Incident".

NO >> Replace transaxle assembly. Refer to TM-283, "Removal and Installation".

6.CHECK PARK/NEUTRAL POSITION (PNP) SWITCH POWER SUPPLY

  1. Turn ignition switch OFF.
  2. Disconnect 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?


Is the inspection result normal? YES >> GO TO 7.

NO >> Perform the trouble diagnosis for power supply circuit.

7.CHECK PNP SWITCH INPUT SIGNAL CIRCUIT

  1. Turn ignition switch OFF.
  2. Disconnect ECM harness connector
  3. Check the continuity between PNP switch harness connector and ECM harness connector.


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

Is the inspection result normal? YES >> GO TO 8.

NO >> Repair or replace error-detected parts.

8.CHECK PNP SWITCH

Check the PNP switch. Refer to TM-17, "PARK/NEUTRAL POSITION (PNP) SWITCH : Component Inspection".

Is the inspection result normal? YES >> Check intermittent incident. Refer to GI-39, "Intermittent Incident".

NO >> Replace PNP switch. Refer to TM-21, "Removal and Installation".

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