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 MANUALSCHEVROLET1999CUTAWAY 7.4 JREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROL SYSTEM - TESTS W/CODES - DTC P1537-U1193DTC P1626DTC P1626: THEFT DETERRENT SYSTEM FUEL ENABLE CIRCUIT (4.0L "G" BODY)DIAGNOSTIC PROCEDURES
1999 Chevrolet Cutaway 7.4 J
Diagnostic Procedures
1999 Chevrolet Cutaway 7.4 JSECTION Diagnostic Procedures
- Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS INTRODUCTION article. After performing OBD system check, go to next step.
- Attempt to start engine. If engine cranks, go to next step. If engine does not crank, check starting system. See appropriate STARTERS article in STARTING & CHARGING SYSTEMS.
- Turn ignition off. Disconnect PASS-Key® module harness connector. Turn ignition on. Using DVOM, check voltage between ground and PASS-Key® module fuel enable input circuit at harness connector terminal. If voltage reading is 2-6 volts, go to next step. If voltage reading is not 2-6 volts, go to step 6.
- Turn ignition off. Reconnect PASS-Key® module harness connector. Turn ignition on. Measure DC frequency between PASS-Key® module fuel enable input circuit terminal and ground. If frequency reading is 40-60 Hz, go to next step. If frequency reading is not 40-60 Hz, go to step 8.
- Clear DTC. Attempt to start engine. If engine starts, fault is not present. If engine does not start, go to step 12.
- Store fluid life index as indicated on scan tool. Turn ignition off and wait 30 seconds, then disconnect PCM harness connector C1. Using DVOM, check resistance of PASS-Key® fuel enable circuit between PCM harness connector C1 and PASS-Key® module harness connector terminals. If resistance is 5 ohms or less, go to next step. If resistance is greater than 5 ohms, go to step 10.
- Check resistance between ground and PASS-Key® fuel enable input circuit at PCM harness connector terminal. If resistance is greater than 10,000 ohms, go to step 12. If resistance is not greater than 10,000 ohms, go to step 11.
- Check terminal contact at PASS-Key® module harness connector. Repair as necessary. If terminal contacts are okay, go to next step.
- Replace PASS-Key® module.
- Repair open in fuel enable input circuit.
- Repair short to ground in fuel enable input circuit.
- Check terminal contact at PCM harness connector C1. Repair as necessary. If terminal contact is okay, go to next step.
- Replace PCM. Program replacement PCM using required equipment.
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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.