Diagnostic procedure

WARNING: This page is about a different car, the 2005 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

DTC C1145, C1155, C1165, C1175 DIAGNOSTIC PROCEDURE

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