Mazda 6 Workshop Manual page 177

Diagnostic procedure
STEP
1 VERIFY FREEZE FRAME DATA HAS BEEN
RECORDED
• Has FREEZE FRAME DATA been recorded?
2 VERIFY RELATED REPAIR INFORMATION
AVAILABILITY
• Verify related service repair information
availability.
• Is any related repair information available?
3 VERIFY CURRENT SIGNAL STATUS: IS
CONCERN INTERMITTENT OR CONSTANT?
• Connect the WDS or equivalent to the DLC-2.
• Clear the DTC from the PCM memory using
the WDS or equivalent.
• Start the engine.
• Is the same DTC present?
4 INSPECT NEUTRAL SWITCH CONNECTOR
FOR POOR CONNECTION
• Turn the engine switch off.
• Inspect for poor connection (such as damaged/
pulled-out terminals, corrosion).
• Is there any malfunction?
5 INSPECT NEUTRAL SWITCH SIGNAL CIRCUIT
FOR SHORT TO GND
• Turn the engine switch off.
• Inspect for continuity between neutral switch
terminal A and body GND.
• Is there continuity?
6 INSPECT NEUTRAL SWITCH GND CIRCUIT
FOR OPEN CIRCUIT
• Turn the engine switch off.
• Inspect for continuity between neutral switch
terminal B and body GND.
• Is there continuity?
7 INSPECT NEUTRAL SWITCH
• Inspect the neutral switch.
• Is there any malfunction?
8 INSPECT PCM CONNECTO FOR POOR
CONNECTION
• Turn the engine switch off.
• Inspect for poor connection (such as damaged/
pulled-out terminals, corrosion).
• Is there any malfunction?
9 INSPECT NEUTRAL SWITCH SIGNAL CIRCUIT
FOR OPEN CIRCUIT
• Turn the engine switch off.
• Inspect for continuity between neutral switch
terminal A and PCM terminal 56.
• Is there continuity?
10 VERIFY TROUBLESHOOTING OF DTC P0850
COMPLETED
• Make sure to reconnect all disconnected
connectors.
• Clear the DTC from the PCM memory using
the WDS or equivalent.
• Start the engine.
• Is the same DTC present?
11 VERIFY AFTER REPAIR PROCEDURE
• Perform the Repair Verification Drive Mode.
(See F2–39 OBD DRIVE
• Are any DTCs present?
End Of Sie
ON-BOARD DIAGNOSTIC
INSPECTION
MODE.)
Yes Go to the next step.
No Record the FREEZE FRAME DATA on the repair order,
then go to the next step.
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.
Yes Go to the next step.
No Intermittent concern exists.
Perform the "INTERMITTENT CONCERNS
TROUBLESHOOTING".
Yes Repair or replace the terminal, then go to Step 10.
No Go to the next step.
Yes Repair or replace the wiring harness for a short to GND,
then go to Step 10.
No Go to the next step.
Yes Go to the next step.
No Repair or replace the wiring harness for an open circuit,
then go to Step 10.
Yes Replace the neutral switch, then go to Step 10.
No Go to the next step.
Yes Repair or replace the terminal, then go to Step 10.
No Go to the next step.
Yes Go to the next step.
No Repair or replace the wiring harness for an open circuit,
then go to the next step.
Yes Replace the PCM, then go to the next step.
No Go to the next step.
Yes Go to the applicable DTC inspection.
(See F2–40 DTC TABLE.)
No Troubleshooting completed.
ACTION
F2–165
F2