Mazda 2002 6 Workshop Manual page 291

DTC P0850 Neutral switch circuit malfunction
Diagnostic procedure
STEP
1 VERIFY FREEZE FRAME DATA HAS BEEN
RECORDED
• Has FREEZE FRAME DATA been recorded?
2 VERIFY RELATED SERVICE INFORMATION
AVAILABILITY
• Check for related Service Information
availability.
• Is any related Service Information available?
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?.
4 INSPECT NEUTRAL SWITCH CONNECTOR
FOR POOR CONNECTION
• Turn ignition switch to OFF.
• Disconnect neutral switch connector.
• Inspect for poor connection (damaged/pulled-
out terminals, corrosion, etc.).
• Is there malfunction?
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.
• Is CPP/PNP PID on?
6 INSPECT NEUTRAL SWITCH
• Perform neutral switch inspection.
(See F–59 NEUTRAL SWITCH
• Is neutral switch okay?
ON-BOARD DIAGNOSTIC
INSPECTION
INSPECTION.)
Yes Go to next step.
No Record FREEZE FRAME DATA on repair order, then go to
next step.
Yes Perform repair or diagnosis according to available Service
Information.
• If vehicle is not repaired, go to next step.
No Go to next step.
Yes Go to Next step.
No Go to Step 10.
Yes Repair or replace terminal, then go to Step 14.
No Go to next step.
Yes Go to next step.
No Go to Step 7.
Yes Go to Step 14.
No Replace neutral switch, then go to Step 14.
ACTION
F–161
F