DTC P0850 [MZR-CD (RF Turbo)]

BME010200800W02

DTC P0850

Neutral switch circuit malfunction

DETECTION CONDITION

• PCM monitors input voltage from neutral switch while engine is running. If input voltage from neutral switch does not change when vehicle stops after accelerating to above 60 km/h {37 mph} and decelerating to 0 km/h {0 mph} two times, PCM determines neutral switch circuit malfunction.

POSSIBLE CAUSE

• Neutral switch malfunction
• Connector or terminal malfunction
• Short to GND in wiring between neutral switch terminal A and PCM terminal 56
• Open circuit in wiring between neutral switch terminal B and GND
• Open circuit in wiring between neutral switch terminal A and PCM terminal 56
• PCM malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION

1
VERIFY RELATED REPAIR INFORMATION AVAILABILITY
• Check for related Service Information availability.
• Is any related repair information available?
Yes
Perform repair or diagnosis according to available Service Information.
• If vehicle is not repaired, go to next step.
No
Go to next step.
2
CLASSIFY MALFUNCTION OF SHORT TO GND OR OPEN
• Turn engine switch to ON (Engine OFF).
• Engage gear.
• Access CPP/PNP PID using WDS or equivalent.
• Is CPP/PNP PID OFF?
Yes
Go to Step 5.
No
Go to next step.
3
INSPECT NEUTRAL SWITCH FOR CLOSE STUCK
• Turn engine switch to ON (Engine OFF).
• Disconnect neutral switch connector.
• Access CPP/PNP PID using WDS or equivalent.
• Is CPP/PNP PID OFF?
Yes
Replace neutral switch, go to Step 10.
No
Go to next step.
4
INSPECT NEUTRAL SWITCH SIGNAL CIRCUIT FOR SHORT TO GND
• Turn engine switch to OFF.
• Inspect continuity between neutral switch terminal A and body GND.
• Is there continuity?
Yes
Repair or replace harness for short to GND, go to Step 10.
No
Go to next step.
5
INSPECT POOR CONNECTION OF NEUTRAL SWITCH CONNECTOR
• Turn engine switch to OFF.
• Inspect for poor connection (damaged, pulled-out terminals, corrosion, etc.).
• Is there any malfunction?
Yes
Repair or replace suspected terminal, go to Step 10.
No
Go to next step.
6
INSPECT NEUTRAL SWITCH FOR OPEN STUCK
• Turn engine switch to ON (Engine OFF).
• Disconnect neutral switch connector.
• Connect jumper wire between neutral switch connector terminals.
• Access CPP/PNP PID using WDS or equivalent.
• Is CPP/PNP PID ON?
Yes
Replace neutral switch, go to Step 10.
No
Go to next step.
7
INSPECT NEUTRAL SWITCH GND CIRCUIT FOR OPEN
• Turn engine switch to OFF.
• Inspect continuity between neutral switch terminal B and body GND.
• Is there continuity?
Yes
Go to next step.
No
Repair or replace harness for open, go to Step 10.
8
INSPECT POOR CONNECTION OF PCM CONNECTOR
• Turn engine switch to OFF.
• Inspect for poor connection (damaged, pulled-out terminals, corrosion, etc.).
• Is there any malfunction?
Yes
Repair or replace suspected terminal, go to Step 10.
No
Go to next step.
9
INSPECT NEUTRAL SWITCH SIGNAL CIRCUIT FOR OPEN
• Turn engine switch to OFF.
• Inspect continuity between neutral switch terminal A and PCM terminal 56.
• Is there continuity?
Yes
Go to next step.
No
Repair or replace harness for open, go to next step.
10
VERIFY TROUBLESHOOTING OF DTC P0850 COMPLETED
• Make sure to reconnect all disconnected connectors.
• Clear DTC from PCM memory using WDS or equivalent.
• Start engine.
• Is same DTC present?
Yes
Replace PCM, go to next step.
No
Go to next step.
11
VERIFY AFTER REPAIR PROCEDURE
• Perform "After Repair Procedure".
• Is there any DTC present?
Yes
Go to applicable DTC inspection.
No
Troubleshooting completed.