Engine Controls

P0850 PNP SWITCH

Description

When the selector lever position is P or N, Transmission range switch is ON.
ECM detects the position because the continuity of the line (the ON signal) exists.


DTC Logic


DTC DETECTION LOGIC







DTC CONFIRMATION PROCEDURE


1. INSPECTION START

Do you have CONSULT?
Do you have CONSULT?
YES- GO TO 2.
NO- GO TO 5.

2. PRECONDITIONING

If DTC CONFIRMATION PROCEDURE has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test.
- GO TO 3.

3. CHECK TRANSMISSION RANGE SWITCH FUNCTION

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

Perform Component Function Check. Refer to "Component Function Check" .
NOTE:
Use Component Function Check to check the overall function of the Transmission range switch 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

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





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


Diagnosis Procedure


1. CHECK TRANSMISSION RANGE SWITCH POWER SUPPLY CIRCUIT

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. DETECT MALFUNCTIONING PART

Check the following.
- Harness connectors E6, F123
- IPDM E/R harness connector E15
- 10 A fuse (No. 58)
- Harness for open or short between transmission range switch and IPDM E/R
- Repair open circuit or short to ground or short to power in harness or connectors.

3. CHECK PNP INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT-I

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 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 E6, F123
- Harness for open or short between transmission range switch and ECM
- Repair open circuit or short to ground or short to power in harness or connectors.

5. CHECK TRANSMISSION RANGE SWITCH

Refer to ."Component Inspection (Transmission Range Switch)" P0705
Is the inspection result normal?
YES- GO TO 6.
NO- Replace transmission range switch. Refer to "Removal and Installation" Removal And Installation.

6. CHECK INTERMITTENT INCIDENT

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