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

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.
• 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
• 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.