P0850

P0850 PNP SWITCH

Description

When the selector lever position is P or N, park/neutral position (PNP) signal from the transmission range switch 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 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 under the following conditions.





Is the inspection result normal?
YES- GO TO 4.
NO- Proceed 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- Proceed to "Diagnosis Procedure" .
NO- INSPECTION END

5. PERFORM COMPONENT FUNCTION CHECK

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- Proceed to "Diagnosis Procedure" .


Component Function Check


1. PERFORM COMPONENT FUNCTION CHECK

1.Turn ignition switch ON.
2.Check the voltage between ECM harness connector terminals.





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


Diagnosis Procedure


1. 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?
YES- GO TO 3.
NO- GO TO 2.

2. 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.





4.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.

3. 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.





4.Also check harness for short to ground and to power.
Is the inspection result normal?
YES- GO TO 4.
NO- Repair or replace error-detected parts.

4. CHECK TRANSMISSION RANGE SWITCH

Check the transmission range switch. Refer to "Component Inspection" CVT RE0F10E.
Is the inspection result normal?
YES- Check intermittent incident. Refer to "Intermittent Incident" Intermittent Incident.
NO- Replace transaxle assembly. Refer to "Removal and Installation" Removal And Installation.