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The EBCM automatically clears the history DTC when a current DTC is not detected in 100 Diagnostic Aids Inspect the back of the wheel bearing on the encoder surface for metal debris that could If 2 or more wheel speed sensors are inoperative diagnose each wheel speed sensor An ECE 13 response may be required, after repairs are made, and DTCs are cleared, If the customer comments that the ABS indicator is ON only during moist environmental 1. Spray the suspected area with a 5 percent saltwater solution. To create a 5 percent saltwater solution, add 2 teaspoons of salt to 8 fl oz of water (10 g of salt to 200 ml of water). 2. Test drive the vehicle over various road surfaces: bumps, turns, etc., above 40 km/h (25 mph) for at least 30 seconds. 3. Rinse the area thoroughly when completed. Reference Information Schematic Reference Antilock Brake System Schematics Connector End View Reference Component Connector End Views Description and Operation ABS Description and Operation (With JL4) or ABS Description and Operation (Without Electrical Information Reference
2008 Chevrolet Silverado 1500 2008 BRAKES Antilock Brake System - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Circuit Testing Connector Repairs Testing for Intermittent Conditions and Poor Connections Wiring Repairs Scan Tool Reference Control Module References for Scan Tool Information Circuit/System Verification Observe the scan tool Wheel Speed Sensor parameter. The reading should be the same speed on Circuit/System Testing It is recommended that Component Testing is performed before Circuit Testing when diagnosing 1. Ignition OFF, disconnect the harness connector at the EBCM. 2. Ignition ON, test for less than 1 volt between the low reference circuit terminals of the appropriate sensor listed below and ground. LR Sensor circuit terminal 20 RR Sensor circuit terminal 31 If greater than the specified value, test the low reference circuit for a short to voltage. 3. Test for less than 1 volt between the signal circuit terminals of the appropriate sensor listed below and ground. LR Sensor circuit terminal 33 RR Sensor circuit terminal 19 If greater than the specified value, test the signal circuit for a short to voltage. If the 4. Ignition OFF, test for infinite resistance between the low reference terminals of the appropriate sensor listed below and ground. LR Sensor circuit terminal 20 RR Sensor circuit terminal 31 If less than the specified value, test the low reference circuit for a short to ground. If
2008 Chevrolet Silverado 1500 2008 BRAKES Antilock Brake System - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
the circuit tests normal, test or replace the wheel speed sensor. 5. Test for infinite resistance between the following signal circuit terminals of the appropriate sensor listed below and ground. LR Sensor circuit terminal 33 RR Sensor circuit terminal 19 If less than the specified value, test the signal circuit for a short to ground. If the circuit 6. Ignition OFF, disconnect the harness connector at the appropriate WSS. 7. Test for less than 2 ohms between the appropriate low reference circuit terminals listed below. LR Sensor circuit terminals 20 at the EBCM harness connector, and terminal A at the RR Sensor circuit terminals 31 at the EBCM harness connector, and terminal A at the If greater than the specified value, test the low reference circuit for an open or high 8. Test for less than 2 ohms between the appropriate signal circuit terminals listed below. LR Sensor circuit terminals 33 at the EBCM harness connector, and terminal B at the RR Sensor circuit terminals 19 at the EBCM harness connector, and terminal B at the If greater than the specified value, test the signal circuit for an open or high resistance. 9. If all circuits test normal, replace the EBCM. Component Testing 1. Ignition OFF, disconnect the harness connector at the suspect wheel speed sensor. 2. Ignition On, test at the harness connector for 10-12 volts between the signal circuit terminal, and low reference circuit terminal. If not within the specified range, perform the Circuit/System Testing procedure. 3. Connect a jumper wire between the signal circuit terminal on the harness side, and to the wheel speed sensor signal circuit terminal on the WSS. 4. Connect a DMM between the low reference terminal at the WSS, and to the low reference terminal on the harness connector. Set up the DMM to measure mA using the DC scale. 5. Spin the wheel very slowly. Using the DMM MIN/MAX feature, test for 4-8 mA on the
2008 Chevrolet Silverado 1500 2008 BRAKES Antilock Brake System - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
MIN capture, and 12-16 mA on the MAX capture. The sensor mA readings should toggle If not within the specified range, replace the wheel speed sensor. 6. If all sensor circuits test normal, perform the Circuit/System Testing procedure. Repair Procedures Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Rear Wheel Speed Sensor Replacement Control Module References for EBCM replacement, setup, and programming DTC C0055 OR P0609 (WITH JF3 OR JH6) Diagnostic Instructions 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. DTC Descriptors DTC C0055 00 Rear Wheel Speed Sensor Circuit DTC C0055 5A Rear Wheel Speed Sensor Plausibility Failure Diagnostic Fault Information Circuit/System Description The electronic control module (ECM) converts the data from the vehicle speed sensor to a 128K Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance Rear Wheel Speed Sensor Signal C0055 00 C0055 00 C0055 00 C0055 5A
2008 Chevrolet Silverado 1500 2008 BRAKES Antilock Brake System - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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