Mazda 6 Workshop Manual page 163

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 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 POOR CONNECTION OF SUCTION
CONTROL VALVE CONNECTOR
• Turn the engine switch off.
• Inspect for poor connection (such as damaged/
pulled-out terminals, corrosion).
• Is there any malfunction?
5 INSPECT SUCTION CONTROL VALVE CIRCUIT
FOR A SHORT TO GND
• Turn the engine switch off.
• Inspect for continuity between the following
terminals and body GND:
— Suction control valve terminal A and body
GND.
— Suction control valve terminal B and body
GND.
• Is there continuity?
6 INSPECT SUCTION CONTROL VALVE
• Inspect the suction control valve.
•
Is there any malfunction?
7 INSPECT PCM CONNECTOR FOR POOR
CONNECTION
• Turn the engine switch off.
• Inspect for poor connection (such as damaged/
pulled-out terminals, corrosion).
• Is there any malfunction?
8 INSPECT SUCTION CONTROL VALVE CIRCUIT
FOR OPEN CIRCUIT
• Turn the engine switch off.
• Inspect for continuity between the following
terminals:
— Suction control valve terminal A and PCM
terminal 93.
— Suction control valve terminal B and PCM
terminal 94.
• Is there continuity?
9 VERIFY TROUBLESHOOTING OF DTC P0628
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?
10 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
Service 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 suspected terminal, go to Step 9.
No Go to the next step.
Yes Repair or replace the wiring harness for a short to GND, go
to Step 9.
No Go to the next step.
Yes Repair the supply pump, go to Step 9.
No Go to the next step.
Yes Repair or replace the suspected terminal, go to Step 9.
No Go to the next step.
Yes Go to the next step.
No Repair or replace the wiring harness for an open circuit, go
to the next step.
Yes Replace the PCM, 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
F2–151
F2