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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 Circuit Testing Connector Repairs Testing for Intermittent Conditions and Poor Connections Wiring Repairs Scan Tool Reference Control Module References for Scan Tool Information
2008 Chevrolet Silverado 1500 2008 BRAKES Antilock Brake System - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Circuit/System Verification Observe the scan tool Wheel Speed Sensor parameter. The reading should be the same speed on Circuit/System Testing 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. LF Sensor circuit terminal 34 RF Sensor circuit terminal 6 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. LF Sensor circuit terminal 21 RF Sensor circuit terminal 18 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. LF Sensor circuit terminal 34 RF Sensor circuit terminal 6 If less than the specified value, test the low reference circuit for a short to ground. If 5. Test for infinite resistance between the following signal circuit terminals of the appropriate sensor listed below and ground. LF Sensor circuit terminal 21 RF Sensor circuit terminal 18 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. IMPORTANT: It is recommended that Component Testing is performed before Circuit Testing when diagnosing wheel speed sensors.
2008 Chevrolet Silverado 1500 2008 BRAKES Antilock Brake System - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
7. Test for less than 2 ohms between the appropriate low reference circuit terminals listed below. LF Sensor circuit terminals 34 at the EBCM harness connector, and terminal 1 at the RF Sensor circuit terminals 6 at the EBCM harness connector, and terminal 1 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. LF Sensor circuit terminals 21 at the EBCM harness connector, and terminal 2 at the RF Sensor circuit terminals 18 at the EBCM harness connector, and terminal 2 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 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.
2008 Chevrolet Silverado 1500 2008 BRAKES Antilock Brake System - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Front Wheel Speed Sensor Replacement (JD9, JF3, JF7) or Front Wheel Speed Control Module References for EBCM replacement, setup, and programming DTC C0035 OR C0040 (WITH JF3/JF7 OR JH6/JH7) 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 C0035 02 Left Front Wheel Speed Sensor Circuit Short to Ground DTC C0035 05 Left Front Wheel Speed Sensor Circuit Short to Battery or Open DTC C0035 0F Left Front Wheel Speed Sensor Circuit Erratic DTC C0035 18 Left Front Wheel Speed Sensor Circuit Signal Amplitude Below Minimum DTC C0040 02 Right Front Wheel Speed Sensor Circuit Short to Ground DTC C0040 05 Right Front Wheel Speed Sensor Circuit Short to Battery or Open DTC C0040 0F Right Front Wheel Speed Sensor Circuit Erratic
2008 Chevrolet Silverado 1500 2008 BRAKES Antilock Brake System - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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