Mazda CX-7 2007 Workshop Manual page 1367

Diagnostic procedure
STEP
1 INSPECT DTC FROM PCM
• Connect the M-MDS to the DLC-2.
• Are any DTCs from the PCM displayed?
2 INSPECT BCM CONNECTOR
• Disconnect the BCM connector.
• Inspect the BCM connector terminals for
poor connection (such as damaged/pulled-
out pins, and corrosion).
• Is there any malfunction?
3 INSPECT BCM POWER SUPPLY CIRCUIT
FOR OPEN CIRCUIT
• Disconnect the negative battery cable.
• Disconnect the positive battery cable.
• Turn the ignition switch to ON.
• Inspect for continuity between following
terminals:
— BCM terminal 4I (wiring harness-side) —
battery positive terminal (wiring harness-
side)
— BCM terminal 4J (wiring harness-side) —
battery positive terminal (wiring harness-
side)
— BCM terminal 1I (wiring harness-side) —
battery positive terminal (wiring harness-
side)
• Is there continuity?
4 INSPECT BCM POWER SUPPLY CIRCUIT
FOR SHORT TO GND
• Inspect for continuity between following
terminals:
— BCM terminal 4I (wiring harness-side) —
body GND
— BCM terminal 4J (wiring harness-side) —
body GND
— BCM terminal 1I (wiring harness-side) —
body GND
• Is there continuity?
5 VERIFY TROUBLESHOOTING COMPLETED
• Make sure to reconnect all disconnected
connectors.
• Clear the DTC from the BCM memory using
the M-MDS.
• Turn the ignition switch to LOCK position
then ON position.
• Is the same DTC present?
End Of Sie
ON-BOARD DIAGNOSTIC [BCM]
INSPECTION
Yes Perform DTC inspection.
(See 01-02-13 DTC TABLE[L3 WITH TC].)
Go to Step 5.
No Go to the next step.
Yes Repair or replace the terminal, then go to Step 5.
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 Step 5.
Yes Repair or replace the wiring harness for a possible short to
GND, then go to the next step.
No Go to the next step.
Yes Replace the BCM.
(See 09-40-1 BODY CONTROL MODULE (BCM)
REMOVAL/INSTALLATION.)
No DTC troubleshooting completed.
ACTION
09-02F–5
09-02F