B1342/C1730/B1484/C1954 - Mazda CX-7 2007 Workshop Manual

DTC B1342, C1730
DTC B1342, C1730
• B1342
— The DSC HU/CM on-board diagnostic function detects control module malfunction.
DETECTION
• C1730
CONDITION
— Excess current is detected in the power supply circuit of the ABS wheel-speed sensor.
POSSIBLE
• DSC HU/CM internal malfunction
CAUSE
Diagnostic procedure
STEP
1 VERIFY CURRENT STATUS OF
MALFUNCTION
• Clear the DTC from the memory.
(See 04-02-3 ON-BOARD DIAGNOSIS.)
• Start the engine and drive the vehicle at 10
km/h {6.2 mph} or more.
• Is the same DTC present?
2 VERIFY AFTER REPAIR PROCEDURE
• Are any other DTCs present?
End Of Sie
DTC B1484, C1954
DTC B1484, C1954
• B1484
— Open circuit in the wiring harness between the DSC HU/CM terminal and the brake switch terminal
• C1954
DETECTION
— Brake switch ON signal is not input when the brake fluid pressure sensor signal reaches the
CONDITION
specified value.
— Brake switch ON signal is input even if the signal from the brake fluid pressure sensor is less than the
specification.
• Brake switch malfunction
POSSIBLE
• Open circuit in the wiring harness between the DSC HU/CM terminal N and the brake switch terminal D
CAUSE
AS AQ AO AM
AT AR AP AN AL
ON-BOARD DIAGNOSTIC
DSC HU/CM system
INSPECTION
Brake switch system
N
DSC HU/CM
DSC HU/CM WIRING HARNESS-SIDE CONNECTOR
AK AI AG AE AC AA Y W
AJ AH AF AD AB Z X
BRAKE SWITCH WIRING HARNESS-SIDE CONNECTOR
Yes Replace the DSC HU/CM, then go to the 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.
BRAKE SWITCH
D
BRAKE LIGHT
U S Q O M K I
V T R P N L J
C A
D B
id040200800400
ACTION
id040200800500
B
G E
D C B A
H F
04-02–11
04-02