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LF Sensor circuit terminals 34 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. Circuit/System Testing With JH6/JH7 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. LF Sensor circuit terminal 16 RF Sensor circuit terminal 27 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 15 RF Sensor circuit terminal 26 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 16 RF Sensor circuit terminal 27 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.
2008 Chevrolet Silverado 1500 2008 BRAKES Antilock Brake System - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
LF Sensor circuit terminal 15 RF Sensor circuit terminal 26 If less than the specified value, test the signal circuit for a short to ground. If the circuit 6. Test for less than 2 ohms between the appropriate low reference circuit terminals listed below. LF Sensor circuit terminals 16 at the EBCM harness connector, and terminal A at the RF Sensor circuit terminals 27 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 7. Test for less than 2 ohms between the appropriate signal circuit terminals listed below. LF Sensor circuit terminals 15 at the EBCM harness connector, and terminal B at the RF Sensor circuit terminals 26 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. 8. 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.
2008 Chevrolet Silverado 1500 2008 BRAKES Antilock Brake System - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Repair Procedures Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Front Wheel Speed Sensor Replacement (JD9, JF3, JF7) or Front Wheel Speed Control Module References for EBCM replacement, setup, and programming DTC C0045 OR C0050 (WITH JL4) 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 C0045 00 Left Rear Wheel Speed Sensor Circuit DTC C0045 5A Left Rear Wheel Speed Sensor Circuit Erratic Signal DTC C0050 00 Right Rear Wheel Speed Sensor Circuit DTC C0050 5A Right Rear Wheel Speed Sensor Circuit Erratic Signal Diagnostic Fault Information Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance Left Rear Sensor Signal Circuit C0045 00 C0045 00 C0045 00 C0045 5A Left Rear Sensor 12 volt - C0045 00 - C0045 5A
2008 Chevrolet Silverado 1500 2008 BRAKES Antilock Brake System - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Circuit/System Description The wheel speed sensor receives ignition voltage from the electronic brake control module Conditions for Running the DTC C0045 00 or C0050 00 The ignition is ON. Ignition voltage is greater than 9.5 volts. C0045 5A or C0050 5A The ignition is ON. Ignition voltage is greater than 9 volts. The brake pedal is not pressed. A DTC is not set for the other wheel speed circuit on the same axle. Conditions for Setting the DTC An erratic signal output of the wheel speed sensor is detected. A short to voltage, open or ground is detected on the wheel speed sensor signal circuit. A open or short to ground in the wheel speed sensor circuit supply voltage. A missing wheel speed sensor signal Action Taken When the DTC Sets The amber ABS indicator turns ON. The Traction Control indicator turns ON. The driver information center (DIC) displays the warning message. Conditions for Clearing the DTC The condition for setting the DTC is no longer present. Right Rear Sensor Signal Circuit C0050 00 C0050 00 C0050 00 C0050 5A Right Rear Sensor 12 volt - C0050 00 - C0050 5A
2008 Chevrolet Silverado 1500 2008 BRAKES Antilock Brake System - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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