Mazda CX-7 2007 Workshop Manual page 801

DTC C1186, C1266
DTC C1186, C1266
• C1186
— DSC HU/CM internal valve relay remains OFF when valve relay ON is commanded.
DETECTION
• C1266
CONDITION
— DSC HU/CM internal valve relay remains ON (stuck) when valve relay OFF is commanded.
• ABS 2 20A fuse malfunction
• Open circuit or short to ground in the wiring harness between the battery and the DSC HU/CM terminal
POSSIBLE
C
CAUSE
• Open or short circuit in the DSC HU/CM internal valve relay, or stuck valve relay
• Poor connection at connectors (female terminal)
AS AQ AO AM
AT AR AP AN AL
Diagnostic procedure
STEP
1 INSPECT DSC FUSE CONDITION
• Is the ABS 2 20A fuse normal?
2 INSPECT VALVE RELAY POWER SUPPLY
FOR OPEN CIRCUIT
• Turn the ignition switch off.
• Disconnect DSC HU/CM connector.
• Turn the ignition switch to the ON position
(engine off).
• Measure voltage between DSC HU/CM
terminal C (harness-side) and ground.
• Is voltage B+?
3 VERIFY TROUBLESHOOTING COMPLETED
• Clear the DTC from the memory.
(See 04-02-3 ON-BOARD DIAGNOSIS.)
• Is the same DTC present?
4 VERIFY AFTER REPAIR PROCEDURE
• Are any other DTCs present?
End Of Sie
ON-BOARD DIAGNOSTIC
Valve relay system
ABS 2 20A
BATTERY
DSC HU/CM WIRING HARNESS-SIDE CONNECTOR
AK AI AG AE AC AA Y W
AJ AH AF AD AB Z X
INSPECTION
DSC HU/CM
C
U S Q O M K I
V T R P N L J
Yes Go to the next step.
No Replace the fuse, then go to Step 3.
Yes Go to the next step.
No Repair or replace the wiring harness for open circuit
between battery positive terminal and DSC HU/CM terminal
C, then go to the next step.
Yes Replace the DSC HU/CM, then go to next step.
(See 04-15-6 DSC HU/CM REMOVAL/INSTALLATION.)
No Go to the next step.
Yes Go to the applicable DTC inspection.
(See 04-02-3 ON-BOARD DIAGNOSIS.)
No DTC troubleshooting completed.
id040200801300
G E
D C B A
H F
ACTION
04-02–19
04-02