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DTC P0850 [MZR-CD (RF Turbo)]

BME010200800W02

DTC P0850 | Neutral switch circuit malfunction
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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
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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. (See PCM REMOVAL/INSTALLATION [MZR-CD (RF Turbo)].)
No | Go to next step.
11 | VERIFY AFTER REPAIR PROCEDURE • Perform "After Repair Procedure". (See AFTER REPAIR PROCEDURE [MZR-CD (RF Turbo)].) • Is there any DTC present? | Yes | Go to applicable DTC inspection. (See DTC TABLE [MZR-CD (RF Turbo)].)
No | Troubleshooting completed.