P0850

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.


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

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 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 as per the following conditions.





Is the inspection result normal?
YES- GO TO 4.
NO- Proceed to .

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- Proceed to .
NO- INSPECTION END

5. PERFORM COMPONENT FUNCTION CHECK

With GST
Perform component function check. .
NOTE:
Use component function check to check the overall function of the PNP signal circuit. During this check, a 1st trip DTC might not be confirmed.
Is the inspection result normal?
YES- INSPECTION END
NO- Proceed to .


Component Function Check


1. PERFORM COMPONENT FUNCTION CHECK

With GST
1.Turn ignition switch ON.
2.Check the voltage between ECM harness connector terminals as per the following conditions.





Is the inspection result normal?
YES- INSPECTION END
NO- Proceed to .


Diagnosis Procedure


1. CHECK DTC WITH TCM

7AT RE7R01A.
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. Common Item.

3. CHECK PARK/NEUTRAL POSITION (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 connectors F1, E3
- Harness connectors E106, M6
- Harness for open or short between A/T assembly and ECM
- Repair open circuit, short to ground or short to power in harness or connectors.

5. CHECK INTERMITTENT INCIDENT

Perform Intermittent Incident.
- INSPECTION END