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DTC C1148, C1158, C1168, C1178, C1233, C1234, C1235, C1236 [ABS (ABS/TCS)]

id040214874200

DTC | C1148, C1234 C1158, C1233 C1168, C1235 C1178, C1236 | RF ABS wheel-speed sensor/sensor rotor LF ABS wheel-speed sensor/sensor rotor RR ABS wheel-speed sensor/sensor rotor LR ABS wheel-speed sensor/sensor rotor
DETECTION CONDITION | • C1148, C1158, C1168, C1178: - Abnormal sensor output is detected on any of four vehicle wheels when the vehicle goes from start to a speed of 10 km/h {6.2 mph} - Greater than specified amount of ABS demand occurs from front ABS wheel sensors when vehicle is started • C1234, C1233, C1235, C1236: - Abnormal sensor output due to chipping of sensor rotor teeth, etc. is detected - ABS control operates for 60 s or more
POSSIBLE CAUSE | • Short to ground circuit of ABS wheel-speed sensor (s) circuit • Malfunction of ABS wheel-speed sensor (s) • Damaged sensor rotor (s) • Incorrect clearance between ABS wheel-speed sensor and sensor rotor • Poor installation of ABS wheel speed sensor and/or sensor rotor (If the sensor rotor is installed twisted, it may cause output of abnormal wave form at high speeds) • ABS (ABS/TCS) HU/CM internal damage (Solenoid valve malfunction, pump motor malfunction, or pipe clogging)

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.
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.
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. | Yes | Go to Step 9.
| No | Go to Step 6.
• Is output voltage pattern okay?
4 | INSPECT ABS WHEEL-SPEED SENSOR CIRCUIT FOR SHORT TO GROUND • Turn the ignition switch off. • Disconnect ABS (ABS/TCS) HU/CM and ABS wheel-speed sensor connectors. • Inspect continuity between suspected sensor terminal (s) of ABS (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 (ABS/TCS) HU/CM and ABS wheel-speed sensor, then go to Step 9.
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.
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.
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.
No | Replace sensor rotor, then go to Step 9.
8 | INSPECT ABS (ABS/TCS) HU/CM OPERATION • Perform ABS (ABS/TCS) HU/CM system inspection. (See ABS (ABS/TCS) HU/CM SYSTEM INSPECTION) • Is it normal? | Yes | Go to the next step.
No | Replace ABS (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 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 (ABS/TCS) HU/CM, then go to the next step.
No | Go to the next step.
10 | VERIFY AFTER REPAIR PROCEDURE • Is there any other DTC present? | Yes | Go to the applicable DTC inspection. (See DTC Table.)
No | Troubleshooting completed.