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 MANUALSCHEVROLET1999CHEVY EXPRESS G1500, VAN CARGO, 5.7 RREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROL SYSTEM - TESTS W/CODES - DTC P1537-U1193DTC P1626DTC P1626: THEFT DETERRENT SYSTEM FUEL ENABLE CIRCUIT (3.4L "N" BODY)DIAGNOSTIC PROCEDURES
1999 Chevrolet Chevy Express G1500, Van Cargo, 5.7 R
Diagnostic Procedures
1999 Chevrolet Chevy Express G1500, Van Cargo, 5.7 RSECTION Diagnostic Procedures
- Perform DIAGNOSTIC AIDS . After performing OBD system check, go to next step.
- Using scan tool, check if DTC P1610 is also set. If DTC P1610 is set, diagnose DTC P1610 first. If DTC P1610 is not set, go to next step.
- Check if any part of the vehicle theft deterrent system has been tampered. If theft deterrent system has been tampered, go to next step. If theft deterrent system has not been tampered, go to step 5.
- Repair tampered component. After repairs, perform Passlock® learn procedure, then go to step 8.
- Check if Body Function Controller (BFC) indicates that password is valid. If password is valid, go to next step. If password is not valid, go to step 7.
- Replace PCM. Program replacement PCM using required equipment. After replacing PCM, go to step 8.
- Check for BFC related DTCs. Repair as necessary. After repairs, go to next step.
- Using scan tool, select CLEAR INFO or CLEAR DTCs function to clear DTCs. Start and operate engine to normal operating temperature. Operate vehicle within conditions for setting this DTC. If scan tool indicates that this diagnostic ran and passed, go to next step. If scan tool does not indicate that this diagnostic ran and passed, repeat step 2.
- Using scan tool, check if any additional DTCs are set. Diagnose affected DTCs. If no additional DTCs are not set, system is okay.
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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.