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| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Left Front Wheel Speed Sensor Ignition | C0035 04, C1232 00 | C0035 04, C1232 00 | - | C0035 1F C1221 00, C0035 26 C1221 00, C0035 27 C1225 00 |
Left Front Wheel Speed Sensor Signal | C0035 04, C1232 00 | C0035 04, C1232 00 | C0035 0E, C1207 00 | C0035 1F C1221 00, C0035 26 C1221 00, C0035 27 C1225 00 |
Right Front Wheel Speed Sensor Ignition | C0040 04, C1233 00 | C0040 04, C1233 00 | - | C0040 1F C1222 00, C0040 26 C1222 00, C0040 27 C1226 00 |
Right Front Wheel Speed Sensor Signal | C0040 04, C1233 00 | C0040 04, C1233 00 | C0040 0E, C1208 00 | C0040 1F C1222 00, C0040 26 C1222 00, C0040 27 C1226 00 |
Left Rear Wheel Speed Sensor Ignition | C0045 04, C1209 00 | C0045 04, C1234 00 | - | C0045 1F C1223 00, C0045 26 C1223 00, C0045 27 C1227 00 |
Left Rear Wheel Speed Sensor Signal | C0045 04, C1234 00 | C0045 04, C1234 00 | C0045 0E, C1209 00 | C0045 1F C1223 00, C0045 26 C1223 00, C0045 27 C1227 00 |
Right Rear Wheel Speed Sensor Ignition | C0050 04, C1235 00 | C0050 04, C1235 00 | - | C0050 1F C1224 00, C0050 26 C1224 00, C0050 27 C1228 00 |
Right Rear Wheel Speed Sensor Signal | C0050 04, C1235 00 | C0050 04, C1235 00 | C0050 0E, C1210 00 | C0050 1F C1224 00, C0050 26 C1224 00, C0050 27 C1228 00 |
Component | Condition | DTC Symptom Bytes | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Wheel Speed Sensor |
| 26, 27, 1F |
The wheel speed sensor receives ignition voltage from the electronic brake control module and provides a DC square wave signal back to the module. As the wheel spins, the electronic brake control module uses the frequency of the square wave signal to calculate the wheel speed.
| • | Vehicle On or Vehicle in Service Mode |
| • | Ignition voltage is greater than 10 V. |
| • | An open or a high resistance is detected on a wheel speed sensor ignition circuit. |
| • | A short to ground or an open/high resistance is detected on a wheel speed sensor signal circuit. |
| • | A short to ground is detected on a wheel speed sensor ignition circuit. |
| • | A short to voltage is detected on a wheel speed sensor signal circuit. |
| • | Incorrectly mounted wheel speed sensor |
| • | Water intrusion in the wiring harness |
| • | Debris on the wheel speed sensor or the tone ring |
| • | Missing tooth or teeth on the wheel speed sensor tone ring |
| • | The tone ring may be demagnetised |
| • | Air gap between the wheel speed sensor and the tone ring too large |
| • | Electrical magnetic interference with the wheel speed sensor harness |
| • | The ABS indicator turns ON. |
| • | The traction control/stability control indicator turns ON. |
| • | The Service Brake Assist and Service StabiliTrak messages are displayed on the driver information centre. |
| • | The electronic brake control module disables the antilock brake system, he traction control system and the electronic stability program for the duration of the drive cycle. |
| • | The condition for setting the DTC is no longer present. |
| • | The history DTC will clear after 40 consecutive fault-free drive cycles have occurred. |
| • | Do not use a magnet to clean the tone ring. |
| • | Inspect the wheel hub bearing tone ring for rust or corrosion. |
| • | If two or more wheel speed sensors are inoperative, diagnose each wheel speed sensor individually. |
| • | If the customer comments that the ABS indicator is ON only during moist environmental conditions (rain, snow, vehicle wash, etc.), inspect the wheel speed sensor wiring for signs of water intrusion. |
Antilock Brake System Schematics
Control Module References for scan tool information
| ⇒ | If any parameter is not within 1.6 km/h (1 mph) of each other |
| Refer to Circuit/System Testing. |
| ⇓ | If each parameter is within 1.6 km/h (1 mph) of each other |
Note: If any of the symptom codes 26, 27, or 1F are set, refer to the Diagnostic Fault Information table for possible mechanical faults or conditions.
| ⇒ | If 11 V or less |
| 2.1. | Vehicle OFF, disconnect the harness connector at the K17 electronic brake control module. |
| 2.2. | Test for infinite resistance between the ignition circuit and ground. |
| ⇒ | If less than infinite resistance, repair the short to ground on the circuit. |
| ⇓ | If infinite resistance |
| 2.3. | Test for less than 2 Ω in the ignition circuit end to end. |
| ⇒ | If 2 Ω or greater, repair the open/high resistance in the circuit. |
| ⇒ | If less than 2 Ω, replace the K17 electronic brake control module. |
| ⇓ | If greater than 11 V |
| ⇒ | If the parameter does not change |
| 4.1. | Vehicle OFF, disconnect the harness connector at the K17 electronic brake control module, vehicle in service mode. |
| 4.2. | Test for less than 1 V between the signal circuit and ground. |
| ⇒ | If 1 V or greater, repair the short to voltage on the circuit. |
| ⇓ | If less than 1 V |
| 4.3. | Vehicle OFF. |
| 4.4. | Test for infinite resistance between the signal circuit and ground. |
| ⇒ | If less than infinite resistance, repair the short to ground on the circuit. |
| ⇓ | If infinite resistance |
| 4.5. | Test for less than 2 Ω in the signal circuit end to end. |
| ⇒ | If 2 Ω or greater, repair the open/high resistance in the circuit. |
| ⇒ | If less than 2 Ω, replace the K17 electronic brake control module. |
| ⇓ | If the parameter changes |
Perform the Diagnostic Repair Verification after completing the repair.
| • | Control Module References for electronic brake control module replacement, programming and setup |
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