Antilock Brake System (With JL9)
DTC C0035 or C0040 (With JL9)
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptors
DTC C0035 01
-
Left Front Wheel Speed Sensor Circuit Short to Ground
DTC C0035 04
-
Left Front Wheel Speed Sensor Circuit Open
DTC C0035 05
-
Left Front Wheel Speed Sensor Circuit Short to Battery or Open
DTC C0035 0F
-
Left Front Wheel Speed Sensor Circuit Signal Erratic
DTC C0035 26
-
Left Front Wheel Speed Sensor Circuit Signal Frequency Too Low
DTC C0040 01
-
Right Front Wheel Speed Sensor Circuit Short to Ground
DTC C0040 04
-
Right Front Wheel Speed Sensor Circuit Open
DTC C0040 05
-
Right Front Wheel Speed Sensor Circuit Short to Battery or Open
DTC C0040 0F
-
Right Front Wheel Speed Sensor Circuit Signal Erratic
DTC C0040 26
-
Right Front Wheel Speed Sensor Circuit Signal Frequency Too Low
Diagnostic Fault Information
Circuit/System Description
The wheel speeds are detected by passive wheel speed sensors. The wheel speed sensor receives a 5 V reference and a low reference from the electronic brake control module (EBCM) and provides a AC signal back to the module. As the wheel spins, the EBCM uses the frequency of the signal to calculate the wheel speed.
Conditions for Running the DTC
* The ignition is ON.
* Ignition voltage is greater than 10 V.
Conditions for Setting the DTC
C0035 01-C0040 01
A short to ground is detected on the wheel speed 5 V reference circuit.
C0035 04-C0040 04
High resistance is detected on the wheel speed 5 V reference or low reference circuit.
C0035 05-C0040 05
A short to voltage, or an open is detected on 5 V reference or the low reference circuit.
C0035 0F-C0040 0F
* An erratic signal output of the wheel speed sensor is detected 3 times in 200 milliseconds.
* The EBCM detects a change in wheel speed that exceeds 20 km/h (12 mph) between two 10 millisecond wheel speed samples. This must be detected 3 times in 200 milliseconds.
* A missing wheel speed sensor signal
C0035 26-C0040 26
An erratic signal output of the wheel speed sensor.
Action Taken When the DTC Sets
* The EBCM disables the Antilock Brake System (ABS) and Traction Control System (TCS) for the duration of the ignition cycle.
* A driver information center message and/or a warning indicator may be displayed.
Conditions for Clearing the DTC
* The condition for setting the DTC is no longer present.
* The EBCM clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.
Diagnostic Aids
If the customer comments that the ABS indicator is ON only during moist environmental conditions such as rain, snow, or a vehicle wash; then inspect the wheel speed sensor wiring for signs of water intrusion. If the DTC is not current, clear all DTCs and simulate the effects of water intrusion. Test drive the vehicle over various road surfaces such as bumps and turns, above 40 km/h (25 mph) for at least 30 seconds.
* Inspect the back of the wheel bearing on the encoder surface for metal debris that could cause an erratic reading with the sensor. Do not use a magnet to clean the debris, or damage to the encoder ring may occur.
* If both of the wheel speed sensors are inoperative diagnose each wheel speed sensor individually.
* If the ABS, traction control and/or stabilitrak telltales are ON with no DTCs set, after repairs are made, and DTCs are cleared, operate the vehicle at speeds greater than 15 km/h (10 mph) to complete the self test, and the EBCM should turn off the ABS indicator.
Reference Information
Schematic Reference
Antilock Brake System Schematics [1][2]Antilock Brakes / Traction Control Systems
Connector End View Reference
Component Connector End Views 1-2 Shift Solenoid (SS) Valve (M30)
Description and Operation
ABS Description and Operation Description and Operation
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
Scan Tool Reference
Control Module References Control Module References for scan tool information
Circuit/System Verification
Ignition ON, observe the scan tool Wheel Speed Sensor parameter. The reading should be the same speed on all sensors when driving in a straight line at a speed greater than 20 km/h (13 mph).
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the EBCM.
2. Ignition ON, test for less than 1 V between the wheel speed sensor low reference circuit terminal of the appropriate sensor listed below and ground.
* Left front sensor circuit terminal 16
* Right front sensor circuit terminal 27
• If greater than the specified range, test the low reference circuit for a short to voltage.
3. Test for less than 1 V between the signal circuit terminal of the appropriate sensor listed below and ground.
* Left front sensor circuit terminal 15
* Right front sensor circuit terminal 26
• If greater than the specified range, test the signal circuit for a short to voltage.
4. Ignition OFF, test for infinite resistance between the signal circuit terminal of the appropriate sensor listed below and ground.
* Left front sensor circuit terminal 15
* Right front sensor circuit terminal 26
• If less than the specified value, test the signal circuit for a short to ground.
5. Test for infinite resistance between the following low reference circuit terminal of the appropriate sensor listed below and ground.
* Left front sensor circuit terminal 16
* Right front sensor circuit terminal 27
• If less than the specified value, test the signal circuit for a short to ground.
6. Ignition OFF, disconnect the harness connector at the appropriate wheel speed sensor.
7. Ignition OFF, test for less than 2 ohms between the appropriate signal circuit terminals listed below.
* Left front sensor signal circuit terminal 15 at the EBCM harness connector, and terminal B at the wheel speed sensor harness connector
* Right front sensor signal circuit terminal 26 at the EBCM harness connector, and terminal B at the wheel speed sensor harness connector
• If greater than the specified range, test the signal circuit for an open or high resistance.
8. Test for less than 2 ohms between the appropriate low reference circuit terminals listed below.
* Left front sensor low reference circuit terminal 16 at the EBCM harness connector, and terminal A at the wheel speed sensor harness connector
* Right front sensor low reference circuit terminal 27 at the EBCM harness connector, and terminal A at the wheel speed sensor harness connector
• If greater than the specified range, test the low reference circuit for an open or high resistance.
9. If all circuits test normal, replace the wheel speed sensor. If the DTC resets, replace the EBCM.
Component Testing
1. Disconnect the wheel speed sensor connector.
2. Ignition OFF, measure for 700-10,000 ohms across the wheel speed sensor.
• If the resistance is not within the specified range, replace the faulty wheel speed sensor.
3. Spin the wheel, with a scan tool measure the AC voltage across the wheel speed sensor for 100 mv AC or greater.
• If the AC voltage is less than the specified value, replace the faulty wheel speed sensor.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Wheel Speed Sensor Replacement (AWD) Wheel Speed Sensor Replacement (AWD)
* Control Module References Control Module References for EBCM replacement, programming and setup