C1208
DTC C1202 WHEEL SPEED SENSOR FRONT-LH INVALID/NO SIGNALDTC C1205 WHEEL SPEED SENSOR FRONT-RH INVALID/NO SIGNAL
DTC C1208 WHEEL SPEED SENSOR REAR-LH INVALID/NO SIGNAL
DTC C1211 WHEEL SPEED SENSOR REAR-RH INVALID/NO SIGNAL
COMPONENT LOCATION:
GENERAL DESCRIPTION
The wheel speed sensor is the essential component the ABS ECU uses to calculate vehicle speed and to determine whether wheel lock occurs.
For example, rear wheel speed signal is used as a reference value, for vehicle speed, in front wheel drive vehicles, and if a difference between front and rear wheel speed occurs, then ABS control is performed.
Wheel speed sensor is active hall-sensor type.
DTC DESCRIPTION
The ABS ECU monitors the wheel speed sensor signal continuously
This code is set when the sensor air gap is out of specified range or when the ABS control cycle is continued abnormally. The HECU checks for air gap malfunctioning by monitoring the sensor signal at speeds between 2 Km/h to 10 Km/h.
Warning lamp is turned OFF unless additional faults are detected when the IG KEY is turned ON again, and wheel speed is more than 10 Km/h (6.2 mph).
DTC DETECTING CONDITION:
SPECIFICATION:
SCHEMATIC DIAGRAM:
SIGNAL WAVEFORM & DATA:
MONITOR SCANTOOL DATA
1. Ignition "ON" Engine "ON".
2. Connect scan tool to Data Link Connector (DLC)
3. Start and drive vehicle in gear and maintain vehicle speed at or above 10 km/h. (6.2 mph)
4. Monitor the "WHEEL SPEED" parameter on the scan tool.
5. Is parameter displayed within specifications?
YES
Fault is intermittent caused by poor connection in wheel speed sensor harness and/or HECU's connector or was repaired and HECU. memory was not cleared.
Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
Repair or replace as necessary and then go to "Verification 0 Vehicle Repair" procedure.
NO
Go to "Component Inspection" Procedure.
COMPONENT INSPECTION
WHEEL SPEED SENSOR CIRCUIT CHECK
1. Lift the vehicle.
2. Ignition "ON" Engine "OFF".
3. Turn the wheel by hand.
4. Measure waveform between signal terminal of the wheel speed sensor harness connector and chassis ground with oscilloscope.
NORMAL WAVEFORM:
5. Is the measured waveform within specifications?
YES
Substitute with a known-good HECU and check for proper operation.
If problem is corrected, replace HECU and then go to "Verification of Vehicle Repair" procedure.
NO
Check for improper installation of wheel speed sensor. If NG, repair as necessary and then go to "Verification of Vehicle Repair" procedure.
Check for damage of rotor teeth or wheel bearing. If NG, repair as necessary and then go to "Verification of Vehicle Repair" procedure.
Substitute with a known-good Wheel speed sensor and check for proper operation.
If problem is corrected, replace Wheel speed sensor and then go to "Verification of Vehicle Repair" procedure.
VERIFICATION OF VEHICLE REPAIR
After a repair, it is essential to verify that the fault has been corrected.
1. Connect scan tool and select "Diagnostic Trouble Codes (DTCs)" mode
2. Using a scan tool, Clear DTC.
3. Operate the vehicle within DTC Detecting Condition in General Information. (Start and drive vehicle in gear and maintain vehicle speed at or above 10 kmh. (6.2 mph))
4. Using a scan tool, Check DTC present.
5. Are any DTCs present
YES
Go to the applicable troubleshooting procedure.
NO
System performing to specification at this time.