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 MANUALSCADILLAC1993FLEETWOOD BROUGHAM V8-350 5.7LREPAIR AND DIAGNOSISSTARTING AND CHARGINGTESTING AND INSPECTIONINITIAL INSPECTION AND DIAGNOSTIC OVERVIEWTROUBLESHOOTING HINTS - STARTING SYSTEM
1993 Cadillac Fleetwood Brougham V8-350 5.7L
Troubleshooting Hints - Starting System
1993 Cadillac Fleetwood Brougham V8-350 5.7LSECTION Troubleshooting Hints - Starting System
PROCEDURE
NOTE: Check for CCM Diagnostic Trouble Code (DTC) 42 and 43. If present, refer Computers and Controls. Also check for ECM DTC 46. If present, refer to Computers and Controls.
1. Visually inspect the hydrometer (built into Battery).
^ Green dot - Battery is charged.
^ Dark dot - Charge and load test Battery. If Battery passes load test, refer to List of Symptoms.
^ Clear or light yellow dot - Battery electrolyte is low. Replace Battery.
2. Check that Starter Solenoid terminals "S" and "B" and Battery connections are clean and tight.
3. Check that Maxifuse #3 and I/P Fuse #24 are OK. If these fuses are open, check for a short to ground in CKT 1446, CKT 5 or CKT 806.
4. Check that G100 and G101 are clean and tight.
^ 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.
^ Check for proper installation of aftermarket electronic equipment which may affect the integrity of other systems.
NOTE: Check for CCM Diagnostic Trouble Code (DTC) 42 and 43. If present, refer Computers and Controls. Also check for ECM DTC 46. If present, refer to Computers and Controls.
1. Visually inspect the hydrometer (built into Battery).
^ Green dot - Battery is charged.
^ Dark dot - Charge and load test Battery. If Battery passes load test, refer to List of Symptoms.
^ Clear or light yellow dot - Battery electrolyte is low. Replace Battery.
2. Check that Starter Solenoid terminals "S" and "B" and Battery connections are clean and tight.
3. Check that Maxifuse #3 and I/P Fuse #24 are OK. If these fuses are open, check for a short to ground in CKT 1446, CKT 5 or CKT 806.
4. Check that G100 and G101 are clean and tight.
^ 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.
^ Check for proper installation of aftermarket electronic equipment which may affect the integrity of other systems.
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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.