Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2008CHEVY EXPRESS G2500, VAN CARGO, 6.6 6REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1144 (ANTI-LOCK BRAKE SYSTEM, TRACTION CONTROL SYSTEM & STABILITY CONTROL SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC C0035 OR C0040 (WITH JL4 VSES)CIRCUIT/SYSTEM TESTING
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6
Circuit/System Testing
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6SECTION Circuit/System Testing
WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT:
It is recommended that Component Testing is performed before Circuit Testing when diagnosing wheel speed sensors.
- Ignition OFF, disconnect the harness connector at the EBCM.
- 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. If the circuit tests normal, replace the EBCM.
- 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 circuit tests normal, replace the EBCM.
- 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 the circuit tests normal, test or replace the wheel speed sensor.
- 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 tests normal, test or replace the wheel speed sensor.
- Ignition OFF, disconnect the harness connector at the appropriate WSS.
- 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 WSS harness connector
- RF Sensor circuit terminals 6 at the EBCM harness connector, and terminal 1 at the WSS harness connector
- If greater than the specified value, test the low reference circuit for an open or high resistance. If the circuit tests normal, test or replace the wheel speed sensor.
- 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 WSS harness connector
- RF Sensor circuit terminals 18 at the EBCM harness connector, and terminal 2 at the WSS harness connector
- If greater than the specified value, test the signal circuit for an open or high resistance. If the circuit tests normal, test or replace the wheel speed sensor.
- If all circuits test normal, replace the EBCM.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.