#
DTC C1148, C1158, C1168, C1178, C1233, C1234, C1235, C1236 [DSC]

id040220874200

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 ABS 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) • DSC 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 applicable DTC inspection.
No | Go to next step.
2 | VERIFY IF CURRENT CONCERNED INPUT SIGNAL STATUS IS INTERMITTENT OR CONSTANT • Turn ignition key to OFF. • Connect WDS or equivalent to DLC-2. • Start engine and drive vehicle. • Access LF_WSPD, LR_WSPD, RF_WSPD and RR_WSPD using 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 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 normal?
4 | INSPECT ABS WHEEL-SPEED SENSOR CIRCUIT FOR SHORT TO GROUND • Turn ignition key to OFF. • Disconnect DSC HU/CM and ABS wheel-speed sensor connectors. • Inspect continuity between suspected sensor terminal(s) of DSC HU/CM connector (harness side) and ground(s). - RF ABS wheel-speed sensor: M-ground - LF ABS wheel-speed sensor: F-ground - RR ABS wheel-speed sensor: K-ground - LR ABS wheel-speed sensor: Q-ground • Is there continuity? | Yes | Repair or replace harness for short to ground circuit between DSC HU/CM and ABS wheel-sped sensor, then go to Step 9.
No | Go to next step.
5 | INSPECT ABS WHEEL-SPEED SENSOR • Turn ignition key to 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 next step.
No | Replace ABS wheel-speed sensor, 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 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 normal? | Yes | Go to next step.
No | Replace sensor rotor, then go to Step 9.
8 | INSPECT DSC HU/CM OPERATION • Perform DSC HU/CM system inspection. (See DSC SYSTEM INSPECTION.) • Is it normal? | Yes | Go to next step.
No | Replace DSC HU/CM, then go to next step.
9 | VERIFY TROUBLESHOOTING COMPLETED • Make sure to reconnect all disconnected connectors. • Clear DTC from 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 the same DTC present? | Yes | Replace DSC HU/CM, then go to next step.
No | Go to next step.
10 | VERIFY THAT NO OTHER DTCS ARE PRESENT • Are any other DTCs output? | Yes | Go to the applicable DTC inspection. (See DTC Table.)
No | DTC troubleshooting completed.