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Home >> Mazda >> 2006 >> 6 i, 4D Hatchback, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> On-Board Diagnostic [Engine Control System L3) >> DTC P0850 >> Diagnostic Procedure

Diagnostic Procedure

DTC P0850 DIAGNOSTIC PROCEDURE

STEP INSPECTION ACTION
1 VERIFY FREEZE FRAME DATA HAS BEEN RECORDED 
  • Has FREEZE FRAME DATA been recorded?
 Yes Go to the next step.
No Record FREEZE FRAME DATA on repair order, then go to the next step.
2 VERIFY RELATED REPAIR INFORMATION AVAILABILITY 
  • Check for related Service Bulletins and/or online repair information availability.
  • Is any related repair information available?
 Yes Perform repair or diagnosis according to the available repair information.
  • If the vehicle is not repaired, go to the next step.
No Go to the next step.
3 CLASSIFY HIGH INPUT OR LOW INPUT 
  • Connect WDS or equivalent to DLC-2.
  • Access CPP/PNP PID.
  • Verify CPP/PNP PID when gear is neutral position.
  • Is CPP/PNP PID always OFF?
 Yes Go to Next step.
No Go to Step 10.
4 INSPECT NEUTRAL SWITCH CONNECTOR FOR POOR CONNECTION 
  • Turn ignition switch to OFF.
  • Disconnect neutral switch connector.
  • Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
  • Is there any malfunction?
 Yes Repair or replace the terminal, then go to Step 14.
No Go to the next step.
5 CLASSIFY NEUTRAL SWITCH OR CIRCUIT 
  • Connect WDS or equivalent to DLC-2.
  • Access CPP/PNP PID.
  • Connect a jumper wire between neutral switch terminal A and B (wiring harness-side).
  • Is CPP/PNP PID on?
 Yes Go to the next step.
No Go to Step 7.
6 INSPECT NEUTRAL SWITCH 
 Yes Go to Step 14.
No Replace neutral switch, then go to Step 14.
7 INSPECT NEUTRAL SWITCH GROUND CIRCUIT FOR OPEN CIRCUIT 
  • Inspect continuity between neutral switch terminal A (wiring harness-side) and body ground.
  • Is there continuity?
 Yes Go to the next step.
No Repair or replace neutral switch power circuit for open circuit, then Go to Step 14.
8 INSPECT PCM CONNECTOR FOR POOR CONNECTION 
  • Turn ignition switch to OFF.
  • Disconnect PCM connector.
  • Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
  • Is there any malfunction?
 Yes Repair or replace the terminal, then go to Step 14.
No Go to the next step.
9 INSPECT NEUTRAL SWITCH SIGNAL CIRCUIT FOR OPEN CIRCUIT 
  • Inspect continuity between neutral switch terminal B (wiring harness-side) and PCM terminal 1X (wiring harness-side).
  • Is there continuity?
 Yes Repair or replace harness for open circuit, then go to Step 14.
No Go to Step 14.
10 INSPECT NEUTRAL SWITCH CONNECTOR FOR POOR CONNECTION 
  • Turn ignition switch to OFF.
  • Disconnect neutral switch connector.
  • Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
  • Is there any malfunction?
 Yes Repair or replace the terminal, then go to Step 14.
No Go to the next step.
11 CLASSIFY NEUTRAL SWITCH OR CIRCUIT 
  • Connect WDS or equivalent to DLC-2.
  • Access CPP/PNP PID.
  • Verify that CPP/PNP PID changes from ON to OFF when neutral switch connector disconnected.
  • Does CPP/PNP PID change from ON to OFF?
 Yes Go to the next step.
No Go to Step 13.
12 INSPECT NEUTRAL SWITCH 
 Yes Go to Step 14.
No Replace neutral switch, then go to Step 14.
13 INSPECT NEUTRAL SWITCH SIGNAL CIRCUIT FOR SHORT TO GROUND 
  • Inspect continuity between neutral switch terminal B (wiring harness-side) and body ground.
  • Is there continuity?
 Yes Repair or replace harness for short to ground, then go to Step 14.
No Go to the next step.
14 VERIFY TROUBLESHOOTING OF DTC P0850 COMPLETED 
  • Make sure to reconnect all disconnected connectors.
  • Start engine.
  • Clear the DTC from the PCM memory using the WDS or equivalent.
  • Drive vehicle above 30 km/h {19 mph}  and stop vehicle.
  • Depress and release clutch pedal more than 10 times  during drive cycle.
  • Is PENDING CODE for this DTC present?
 Yes Replace PCM, then go to the next step.
(See PCM REMOVAL/INSTALLATION ).
No Go to the next step.
15 VERIFY AFTER REPAIR PROCEDURE 
 Yes Go to the applicable DTC inspection.
(See DTC TABLE ).
No Troubleshooting completed.
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