Mazda CX-7 2007 Workshop Manual page 231

Diagnostic procedure
STEP
1 VERIFY FREEZE FRAME DATA HAS BEEN
RECORDED
• Has the FREEZE FRAME DATA been
recorded?
2 VERIFY RELATED REPAIR INFORMATION
AVAILABILITY
• Check for related Service Bulletins and/or on-
line repair information availability.
• Is any related repair information available?
3 INSPECT OCV CONNECTOR FOR POOR
CONNECTION
• Turn the ignition switch off.
• Inspect for poor connection (such as damaged/
pulled-out pins, corrosion).
• Is there any malfunction?
4 INSPECT OCV
• Perform the OCV inspection.
(See01-10-29 OIL CONTROL VALVE (OCV)
INSPECTION[L3 WITH TC].)
• Is the OCV normal?
5 INSPECT OCV POWER SUPPLY CIRCUIT FOR
OPEN CIRCUIT
• Disconnect the OCV connector.
• Turn ignition switch to the ON position (Engine
off).
• Measure voltage between OCV terminal B
(harness-side) and body ground.
• Is the voltage B+?
6 INSPECT PCM CONNECTOR FOR POOR
CONNECTION
• Turn the ignition switch off.
• Disconnect the PCM connector.
• Inspect for poor connection at PCM terminal
2AF. (such as damaged, pulled-out pins,
corrosion).
• Is there any malfunction?
7 INSPECT OCV CONTROL CIRCUIT FOR SHORT
TO GROUND
• Inspect for continuity between OCV terminal A
(harness-side) and body ground.
• Is there continuity?
8 INSPECT OCV CONTROL CIRCUIT FOR OPEN
CIRCUIT
• Connect the OCV connector.
• Turn ignition switch to the ON position (Engine
off).
• Check for continuity between OCV terminal A
(harness-side) and PCM terminal 2AF
(harness-side).
• Is there continuity?
9 VERIFY TROUBLESHOOTING OF DTC P2088
COMPLETED
• Make sure to reconnect all disconnected
connectors.
• Clear the DTC from the PCM memory using
the M-MDS.
• Turn the ignition switch off.
• Start the engine and warm it up completely.
• Is the PENDING CODE for this DTC present?
10 VERIFY AFTER REPAIR PROCEDURE
• Perform the "After Repair Procedure".
(See01-02-10 AFTER REPAIR
PROCEDURE[L3 WITH TC].)
• Are any DTCs present?
ON-BOARD DIAGNOSTIC [L3 WITH TC]
INSPECTION
Yes Go to the next step.
No Record FREEZE FRAME DATA on the repair order, then go
to the next step.
Yes Perform the 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 Repair or replace the terminal, then go to Step 9.
No Go to the next step.
Yes Go to the next step.
No Replace OCV, then go to Step 9.
Yes Go to the next step.
No Repair or replace the wiring harness for an open circuit,
then go to Step 9.
Yes Repair the terminal, then go to Step 9.
No Go to the next step.
Yes Repair or replace the wiring harness for a short to ground,
then 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 or short to
ground circuit, then go to the next step.
Yes Replace PCM, then go to the next step.
(See01-40-6 PCM REMOVAL/INSTALLATION[L3 WITH
TC].)
No Go to the next step.
Yes Go to the applicable DTC inspection.
(See01-02-13 DTC TABLE[L3 WITH TC].)
No Troubleshooting completed.
ACTION
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