For Mexico

P0850 PNP SWITCH

Description

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


DTC Logic


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

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 "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.





4.Check 1st trip DTC.
Is 1st trip DTC detected?
YES- Go to "Diagnosis Procedure" .
NO- INSPECTION END

5. PERFORM COMPONENT FUNCTION CHECK

WITH GST
Perform Component Function Check. Refer to "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 "Diagnosis Procedure" .


Component Function Check


1. PERFORM COMPONENT FUNCTION CHECK

WITH GST
1.Turn ignition switch ON.
2.Check the voltage between ECM harness connector terminals under the following conditions.





Is the inspection result normal?
YES- INSPECTION END
NO- Go to "Diagnosis Procedure" .


Diagnosis Procedure


1. CHECK DTC WITH TCM

Refer to "CONSULT Function" Scan Tool Testing and Procedures.
Is the inspection result normal?
YES- GO TO 2.
NO- Repair or replace malfunctioning part.

2. CHECK STARTING SYSTEM

Turn ignition switch OFF, then turn it to START.
Does starter motor operate?
YES- GO TO 3.
NO- Check DTC with BCM. Refer to "DTC Index" Testing and Inspection.

3. CHECK PNP SIGNAL CIRCUIT FOR OPEN AND SHORT

1.Turn ignition switch OFF.
2.Disconnect A/T assembly harness connector.
3.Disconnect ECM harness connector.
4.Check the continuity between A/T assembly harness connector and ECM harness connector.





5.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.
- Harness for open or short between A/T assembly and ECM
- Loose or poor connection for each connector and harness
- Repair open circuit, short to ground or short to power in harness or connectors.

5. CHECK INTERMITTENT INCIDENT

Refer to "Intermittent Incident" Intermittent Incident.
- INSPECTION END