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 MANUALSCHEVROLET1998SUBURBAN K2500, 7.4 J, PART TIMEREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 320 (ENGINE CONTROLS - SYSTEM & COMPONENT TESTING - 3.4L)COMPUTERIZED ENGINE CONTROLSPOWERTRAIN CONTROL MODULEPOWER CIRCUITS
1998 Chevrolet Suburban K2500, 7.4 J, Part Time
Power Circuits
1998 Chevrolet Suburban K2500, 7.4 J, Part TimeSECTION Power Circuits
WARNING: This page is about a different car, the 2003 Pontiac Grand Am, 2003 Oldsmobile Alero, 2003 Chevrolet Monte Carlo, and 2003 Chevrolet Impala. However, it is still accessible from the selected car via links, so may be relevant.
- Using DVOM, check for battery voltage between PCM continuous power terminal(s) and ground. For connector terminal identification, see CONNECTOR IDENTIFICATION in SELF-DIAGNOSTICS - 3.4L ALERO, GRAND AM, IMPALA & MONTE CARLO article. See WIRING DIAGRAMS . If battery voltage is not present, check for open fuse or fusible link. If fuse or fusible link is okay, check for open in circuit between PCM continuous power terminal and power source.
- Turn ignition switch to RUN position. Using DVOM, check for battery voltage between PCM ignition power terminals and ground. If battery voltage is not present, check IGN fuse. If fuse is okay, check for open in circuit between battery and ignition switch, and between ignition switch and PCM ignition power terminal. If circuits are okay, check for defective ignition switch.
- Connect DVOM between ground and PCM starter (crank) signal terminal. On vehicles with manual transaxle, depress clutch pedal. On vehicles with automatic transaxle, place gearshift lever in Park. On all models, turn ignition switch to START position. Battery voltage should be present only when ignition switch is in START position.
- If voltage is not present, check CRANK fuse (10-amp) or fusible link between ignition switch and PCM starter (crank) signal terminal. If fuse or fusible link is okay, check for open in circuit between ignition switch and PCM starter (crank) signal terminal, or check for defective ignition switch.
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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.