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DTC C0040 18 Right Front Wheel Speed Sensor Circuit Signal Amplitude Below Minimum Diagnostic Fault Information Circuit/System Description The wheel speed sensor receives ignition voltage from the electronic brake control module Conditions for Running the DTC C0035 00 or C0040 00 The ignition is ON. Ignition voltage is greater than 9.5 volts. C0035 5A or C0040 5A The ignition is ON. Ignition voltage is greater than 9.5 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 ground, open/high resistance is detected on the wheel speed sensor signal circuit. Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance Left Front Sensor Signal Circuit C0035 02 - C0035 05 C0035 18, 0F Left Front Sensor 12 volt - C0035 05 - C0035 18, 0F Right Front Sensor Signal C0040 02 - C0040 05 C0040 18,0F Right Front Sensor 12 volt - C0040 05 - C0040 18, 0F
2008 Chevrolet Silverado 1500 2008 BRAKES Antilock Brake System - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
A short to voltage, short to ground or an open/high resistance is detected on the low Wheel speed sensor power supply is less than 7.6 volts. A missing wheel speed sensor signal Action Taken When the DTC Sets The EBCM disables the Antilock Brake System (ABS)/Traction Control System (TCS) and The electronic brake distribution (EBD) does not function optimally. The ABS indicator turns ON. The Traction Control indicator turns ON. The driver information center (DIC) displays the Service Stability System message. Conditions for Clearing the DTC The condition for setting the DTC is no longer present. 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
2008 Chevrolet Silverado 1500 2008 BRAKES Antilock Brake System - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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 Circuit/System Verification Observe the scan tool Wheel Speed Sensor parameter. The reading should be the same speed on Circuit/System Testing With JF3/JF7 It is recommended that Component Testing is performed before Circuit Testing when diagnosing
2008 Chevrolet Silverado 1500 2008 BRAKES Antilock Brake System - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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 22 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 34 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 22 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 34 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. 7. Test for less than 2 ohms between the appropriate low reference circuit terminals listed below. LF Sensor circuit terminals 22 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.
2008 Chevrolet Silverado 1500 2008 BRAKES Antilock Brake System - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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