P0850

P0850 PNP Switch

Component Description

When the shift lever position is Neutral, park/neutral position (PNP) switch is ON. (M/T)

When the selector lever position is P or N, park/neutral position (PNP) signal is sent to ECM from TCM via combination meter (unified meter control unit). (A/T)

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

On Board Diagnosis Logic






DTC Confirmation Procedure

CAUTION:

Always drive vehicle at a safe speed.

NOTE:

If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test.

with SDT

1) Turn ignition switch ON.
2) Select "P/N POSI SW" in "Data list" mode with SDT. Then check the "P/N POSI SW" signal under the following conditions.






If NG, go to "Diagnosis Procedure".

If OK, go to following step.
3) Select "Data list" mode with SDT.
4) Start engine and warm it up to normal operating temperature.
5) Maintain the following conditions for at least 50 consecutive seconds.






6) Check 1st trip DTC.
7) If 1st trip DTC is detected, go to "Diagnosis Procedure".

Overall Function Check

Use this procedure to check the overall function of the park/neutral position (PNP) signal circuit. During this check, a 1st trip DTC might not be confirmed.

with GST

1) Turn ignition switch ON.
2) Check voltage between ECM terminal 102 (PNP signal) and ground under the following conditions.











3) If NG, go to "Diagnosis Procedure".

Diagnosis Procedure

A/T Models

1. CHECK DTC WITH TCM

Refer to [Diagnosis and Repair Workflow] DTC Index TCM.

OK or NG
OK
GO TO 2.
NG
Repair or replace.

2. CHECK STARTING SYSTEM

Turn ignition switch OFF, then turn it to START.

Does starter motor operate?

Yes or No
Yes
GO TO 3.
No
Refer to Initial Inspection and Diagnostic Overview.

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

1 Turn ignition switch OFF.
2 Disconnect A/T assembly harness connector.
3 Disconnect combination meter harness connector.
4 Check harness continuity between A/T assembly terminal 9 and combination meter terminal 17.
Refer to Wiring Diagram.






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

OK or NG
OK
GO TO 5.
NG
GO TO 4.

4. DETECT MALFUNCTIONING PART

Check the following.
- Harness connectors M31, E152
- Harness for open or short between A/T assembly and combination meter.


Repair open circuit, short to ground or short to power in harness or connectors.

5. CHECK PNP INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT-II

1 Disconnect ECM harness connector.
2 Check harness continuity between ECM terminal 102 and combination meter terminal 7.
Refer to Wiring Diagram.






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

OK or NG
OK
GO TO 7.
NG
GO TO 6.

6. DETECT MALFUNCTIONING PART

Check the following.
- Harness connectors E152, M31
- Harness for open or short between ECM and combination meter


Repair open circuit, short to ground or short to power in harness or connectors.

7. CHECK PNP INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT-III

1 Check harness continuity between A/T assembly terminal 9 and TCM terminal 8.






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

OK or NG
OK
GO TO 8.
NG
Repair open circuit, short to ground or short to power in harness or connectors.

8. CHECK INTERMITTENT INCIDENT

Refer to [Service Information for Electrical Incident: Intermittent Incident] Service Information for Electrical Incident: Intermittent Incident.

OK or NG
OK
GO TO 9.
NG
Repair or replace.

9. REPLACE COMBINATION METER

Refer to [Engine Control System: Wiring Diagram [QR25DE] Meter System Diagram.


INSPECTION END

M/T Models

1. CHECK PNP SWITCH GROUND CIRCUIT FOR OPEN AND SHORT

1 Turn ignition switch OFF.
2 Disconnect PNP switch harness connector.
3 Check harness continuity between PNP switch terminal 2 and ground.
Refer to Wiring Diagram.






4 Also check harness for short to power.

OK or NG
OK
GO TO 3
NG
GO TO 2.

2. DETECT MALFUNCTIONING PART

Check the following.
- Harness connectors F14, E5
- Harness for open or short between PNP switch and ground


Repair open circuit or short to power in harness or connectors.

3. CHECK PNP SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1 Disconnect ECM harness connector.
2 Check harness continuity between ECM terminal 102 and PNP switch terminal 1.
Refer to Wiring Diagram.






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

OK or NG
OK
GO TO 5.
NG
GO TO 4.

4. DETECT MALFUNCTIONING PART

Check the following.
- Harness connectors F14, E5
- Harness for open or short between PNP switch and ECM


Repair open circuit, short to ground or short to power in harness or connectors.

5. CHECK PNP SWITCH

Refer to [1][2]Electrical Diagrams ].

OK or NG
OK
GO TO 6.
NG
Replace PNP switch.

6. CHECK INTERMITTENT INCIDENT

Refer to [Service Information for Electrical Incident: Intermittent Incident] Service Information for Electrical Incident: Intermittent Incident.


INSPECTION END