Mazda CX-7 2007 Workshop Manual page 1385

DTC C1284[BCM]
DTC C1284 Oil pressure switch circuit failure
DETECTION Open circuit in wiring harness between BCM and oil pressure switch
CONDITION
• Open circuit in wiring harness between BCM terminal 1G and oil pressure switch terminal A
POSSIBLE
• Oil pressure switch malfunction
CAUSE
• BCM malfunction
OIL PRESSURE SWITCH WIRING
HARNESS-SIDE CONNECTOR
Diagnostic procedure
STEP
1 INSPECT OIL PRESSURE SWITCH
CONNECTOR
• Turn the ignition switch off.
• Disconnect the oil pressure switch
connector.
• Inspect the oil pressure switch connector
terminals for poor connection (such as
damaged/pulled-out pins, and corrosion).
• Is there any malfunction?
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 OIL PRESSURE SWITCH SIGNAL
CIRCUIT FOR OPEN CIRCUIT
• Inspect for continuity between BCM terminal
1G (wiring harness-side) and oil pressure
switch terminal A (wiring harness-side).
• Is there continuity?
4 INSPECT OIL PRESSURE SWITCH
• Inspect the oil pressure switch.
(See 09-22-14 OIL PRESSURE SWITCH
INSPECTION.)
• Is there any malfunction?
5 VERIFY TROUBLESHOOTING COMPLETED
• Make sure to reconnect all disconnected
connectors.
• Clear the DTC from the BCM memory using
the M-MDS.
• Perform the self-test.
(See 09-02F-26 BCM SELF-TEST[BCM].)
• Is the same DTC present?
ON-BOARD DIAGNOSTIC [BCM]
OIL PRESSURE SWITCH
A
A
INSPECTION
BCM
1G
BCM WIRING HARNESS-SIDE
CONNECTOR
1O 1M 1K 1I 1G
1P 1N 1L 1J 1H
Yes Repair or replace the terminal, then 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 Replace the oil pressure switch, 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.
id0902f5838400
1E 1C 1A
1F 1D 1B
ACTION
09-02F–23
09-02F