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 MANUALSCHEVROLET2000CHEVY EXPRESS G3500, VAN PASSENGER, 7.4 JREPAIR AND DIAGNOSIS (SINGLE PAGE)BRAKESANTI-LOCK BRAKESANTI-LOCK BRAKE SYSTEM - 4WALDIAGNOSIS & TESTINGDIAGNOSTIC SYSTEM CHECK
2000 Chevrolet Chevy Express G3500, Van Passenger, 7.4 J
Diagnostic System Check
2000 Chevrolet Chevy Express G3500, Van Passenger, 7.4 JSECTION Diagnostic System Check
NOTE:
For circuit reference, see WIRING DIAGRAMS
.
- Install scan tool. If scan tool powers up, go to next step. If scan tool does not power up, diagnose data link communications. See DATA LINK CONNECTORS article in WIRING DIAGRAMS.
- Turn ignition on, with engine off. Using scan tool, attempt to establish communication with PCM and EBCM. If scan tool communicates with control modules, go to next step. If scan tool does not communicate with control modules, go to TEST C: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE under SYMPTOM TESTS.
- Select display DTCs function on the scan tool for PCM and EBCM. If scan tool displays any DTCs, go to next step. If scan tool does not display any DTCs, go to SYMPTOM TESTS .
- If scan tool displays any DTCs which begins with a "U", go to TEST C: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE under SYMPTOM TESTS. If scan tool does not display any "U" series DTC, go to next step.
- If scan tool displays DTC P0500, P0502, P0503, P0562, P0563, P0601-P0607, P1381, P1621, P1627 or P1683, diagnose affected DTCs. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.
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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.