Mazda 6 Workshop Manual page 57

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 PENDING CODE for this DTC present?
4 INSPECT VBC SOLENOID VALVE
CONNECTOR FOR POOR CONNECTION
• Turn the engine switch off.
• Disconnect the VBC solenoid valve connector.
• Inspect for poor connection (such as damaged/
pulled-out pins, corrosion).
• Is there any malfunction?
5 INSPECT VBC SOLENOID VALVE POWER
CIRCUIT FOR OPEN CIRCUIT
• Turn the engine switch to the ON position
(Engine off).
• Measure the voltage between VBC solenoid
valve terminal A (wiring harness-side) and
body GND.
• Is the voltage B+?
6 INSPECT VBC SOLENOID VALVE CONTROL
CIRCUIT FOR SHORT TO GND
• Turn the engine switch off.
• Inspect for continuity between VBC solenoid
valve terminal B (wiring harness-side) and
body GND.
• Is there continuity?
7 INSPECT VBC SOLENOID VALVE
• Inspect the VBC solenoid valve.
• Is there any malfunction?
8 INSPECT PCM CONNECTOR FOR POOR
CONNECTION
• Turn the engine switch off.
• Disconnect the PCM connector.
• Inspect for poor connection (such as damaged/
pulled-out pins, corrosion).
• Is there any malfunction?
9 INSPECT VBC SOLENOID VALVE CONTROL
CIRCUIT FOR OPEN CIRCUIT
• Turn the engine switch off.
• Inspect for continuity between VBC solenoid
valve terminal B (wiring harness-side) and
PCM terminal 67 (wiring harness-side).
• Is there continuity?
10 VERIFY TROUBLESHOOTING OF DTC P0045
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 PENDING CODE for this DTC present?
ON-BOARD DIAGNOSTIC
INSPECTION
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 Go to the next step.
No Repair or replace the wiring harness for a possible open
circuit or short to GND, then go to Step 10.
Yes Repair or replace the wiring harness for a possible short to
GND, then go to Step 10.
No Go to the next step.
Yes Replace the VBC solenoid valve, 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 a possible open
circuit, then go to the next step.
Yes Replace the PCM, then go to the next step.
No Go to the next step.
ACTION
F2–45
F2