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 C1148, C1158, C1168, C1178, C1233, C1234, C1235, C1236 DIAGNOSTIC PROCEDURE

STEP	INSPECTION		ACTION
1	VERIFY OTHER DTC HAS BEEN RECORDED Have DTCs related to solenoid valve, pump motor, or pump motor relay been stored?	Yes	Go to the applicable DTC inspection.
1		No	Go to the next step.
2	VERIFY IF CURRENT CONCERNED INPUT SIGNAL STATUS IS INTERMITTENT OR CONSTANT Turn the ignition switch off. Connect WDS or equivalent to DLC-2. Start engine and drive vehicle. Access LF_WSPD, LR_WSPD, RF_WSPD and RR_WSPD using the WDS or equivalent Do vehicle speeds correspond approximately to the four PIDs above?	Yes	Go to Step 8.
2		No	If there is a difference in speed of four wheels: Go to the next step. if any wheel speed is 0 km/h (0 mph}: Go to Step 4.
3	INSPECT ABS WHEEL-SPEED SENSOR OUTPUT PULSE Start engine and drive vehicle. Inspect output voltage pattern using an oscilloscope. Is output voltage pattern okay?	Yes	Go to step 9.
3		No	Go to step 6.
4	INSPECT ABS WHEEL-SPEED SENSOR CIRCUIT FOR SHORT TO GROUND Turn the ignition switch off. Disconnect ABS/TCS HU/CM and ABS wheel-speed sensor connectors. Inspect continuity between suspected sensor terminal (s) of ABS/TCS HU/CM connector (harness side) and ground (s). RF ABS wheel-speed sensor: G-ground LF ABS wheel-speed sensor: I-ground RR ABS wheel-speed sensor: A-ground LR ABS wheel-speed sensor: C-ground Is there continuity?	Yes	Repair or replace harness for short to ground circuit between ABS/TCS HU/CM and ABS wheel-speed sensor, then go to Step 9.
4		No	Go to the next step.
5	INSPECT ABS WHEEL-SPEED SENSOR Turn the ignition switch off. Disconnect suspected ABS wheel-speed sensor connector (s) and inspect resistance between ABS wheel-speed sensor terminal (s) (part side). Is resistance within 1.3-1.7 kilohm?	Yes	Go to the next step.
5		No	Replace ABS wheel-speed sensor (s), then go to Step 9.
6	INSPECT SENSOR ROTOR CLEARANCE Jack-up vehicle and support it with safety stands. Remove suspected wheel (s). Inspect clearance between ABS wheel-speed sensor and sensor rotor. Is clearance within 0.3-1.1 mm {0.012-0.043 in)?	Yes	Go to the next step.
6		No	Replace ABS wheel-speed sensor (s), then go to Step 9.
7	INSPECT SENSOR ROTOR FOR DAMAGE Jack-up vehicle and support it with safety stands. Remove suspected wheel (s). Visually inspect sensor rotor for missing, deformed and obstructed teeth. Number of teeth: 44 Is sensor rotor okay?	Yes	Go to the next step.
7		No	Replace sensor rotor, then go to Step 9.
8	INSPECT ABS/TCS HU/CM OPERATION Perform ABS/TCS HU/CM system inspection. (See 04-1 3-2 ABS/TCS HU/CM SYSTEM INSPECTION) Is it normal?	Yes	Go to the next step.
8		No	Replace ABS/TCS HU/CM, then go to the next step.
9	VERIFY TROUBLESHOOTING COMPLETED Make sure to reconnect all disconnected connectors. Clear the DTC from the memory (See 04-02-3 Clearing DTCs Procedures) Start engine and drive vehicle at 10 km/h (6.2 mph} or above. Gradually slow down vehicle and stop. Is same DTC present?	Yes	Replace ABS/TCS HU/CM, then go to the next step.
9		No	Go to the next step.
10	VERIFY AFTER REPAIR PROCEDURE Is there any other DTC present?	Yes	Go to the applicable DTC inspection.
10		No	Troubleshooting completed.

Fig 1: DTC C1148, C1158, C1168, C1178, C1233, C1234, C1235, C1236 Diagnostic procedure (1 Of 2)

Courtesy of MAZDA MOTORS CORP.