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.
1998 Oldsmobile Aurora V8-4.0L VIN CFACTORY OEM SERVICE PROCEDURE
Troubleshooting Hints
PERFORM BEFORE BEGINNING SYSTEM DIAGNOSIS
1. Check all CKT 800 (TAN) and CKT 1807 (PPL) wiring for an open or short to ground.
2. Check all CKT 835 (DK GRN) wiring for an open or short to ground.
3. Check all serial data line component connectors for proper terminal contact, beginning with suspect component.
4. Check all serial data line components, beginning with suspect component.
5. Before component replacement, check for poor terminal contact at component and harness connectors.
6. Check for a broken (or partially broken) wire inside of the insulation which could cause system failure but prove good in a continuity/voltage check. (Refer to Troubleshooting Procedures.)
7. Check for proper installation of aftermarket electronic equipment which may effect the integrity of other systems. (Refer to Troubleshooting Procedures.) Diagnostic Aids
1. Check all CKT 800 (TAN) and CKT 1807 (PPL) wiring for an open or short to ground.
2. Check all CKT 835 (DK GRN) wiring for an open or short to ground.
3. Check all serial data line component connectors for proper terminal contact, beginning with suspect component.
4. Check all serial data line components, beginning with suspect component.
5. Before component replacement, check for poor terminal contact at component and harness connectors.
6. Check for a broken (or partially broken) wire inside of the insulation which could cause system failure but prove good in a continuity/voltage check. (Refer to Troubleshooting Procedures.)
7. Check for proper installation of aftermarket electronic equipment which may effect the integrity of other systems. (Refer to Troubleshooting Procedures.) Diagnostic Aids
Factory Service Tools
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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.
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