Mazda 6 2002 Workshop Manual page 615

Diagnostic procedure
STEP
1 INSPECT WHEEL-SPEED SENSOR CIRCUIT
FOR OPEN CIRCUIT
• Turn ignition key to OFF.
• Disconnect ABS (ABS/TCS) HU/CM
connector.
• Measure resistance between suspected
sensor terminals of ABS (ABS/TCS) HU/CM
connector (harness side).
— RF wheel-speed sensor: G—D
— LF wheel-speed sensor: I—E
— RR wheel-speed sensor: A—B
— LR wheel-speed sensor: C—F
• Is resistance within 1.3—1.7 kilohm?
2 INSPECT WHEEL-SPEED SENSOR CIRCUIT
FOR SHORT TO GROUND
• Turn ignition key to OFF.
• Inspect continuity between suspected sensor
terminal(s) of ABS (ABS/TCS) HU/CM
connector (harness side) and ground(s).
— RF wheel-speed sensor: G—D
— LF wheel-speed sensor: I—E
— RR wheel-speed sensor: A—B
— LR wheel-speed sensor: C—F
• Is there continuity?
3 INSPECT WHEEL-SPEED SENSOR
• Turn ignition key to OFF.
• Disconnect suspected sensor connector(s)
and inspect resistance between sensor
terminals (part side).
• Is resistance within 1.3—1.7 kilohm?
4 INSPECT ABS (ABS/TCS) HU/CM TO
WHEEL-SPEED SENSOR CIRCUIT FOR
OPEN CIRCUIT
• Inspect continuity between suspected sensor
terminal(s) of ABS (ABS/TCS) HU/CM
connector (harness side) and wheel-speed
sensor connector. (vehicle harness side)
— RF wheel-speed sensor (+): G—A
— RF wheel-speed sensor (–): D—B
— LF wheel-speed sensor (+): I—A
— LF wheel-speed sensor (–): E—B
— RR wheel-speed sensor (+): A—A
— RR wheel-speed sensor (–): B—B
— LR wheel-speed sensor (+): C—A
— LR wheel-speed sensor (–): F—B
• Is there continuity?
5 VERIFY TROUBLESHOOTING COMPLETED
• Make sure to reconnect all disconnected
connectors.
• Clear DTC from memory
(See P–46 Clearing DTCs
• Is same DTC present?
6 VERIFY AFTER REPAIR PROCEDURE
• Is there any other DTC present?
End Of Sie
P–58
ON-BOARD DIAGNOSTIC (ABS/TCS)
INSPECTION
Procedures)
Yes Go to net step.
No Go to Step 3.
Yes Repair or replace harness for short to ground circuit
between ABS (ABS/TCS) HU/CM and wheel-speed
sensor(s), then go to Step 5.
No Go to Step 5.
Yes Go to net step.
No Replace wheel-speed sensor, then go to Step 5.
Yes Repair or replace poor connections of ABS (ABS/TCS) HU/
CM connector and/or wheel-speed sensor connector(s),
then go to net step.
No Repair or replace harness for open circuits between ABS
(ABS/TCS) HU/CM and wheel-speed sensor(s), then go to
net step.
Yes Replace ABS (ABS/TCS) HU/CM, then go to net step.
No Go to net step.
Yes Go to applicable DTC inspection.
No Troubleshooting completed.
ACTION