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.
1989 Cadillac Seville BaseFACTORY OEM SERVICE PROCEDURE
DFI SYS/Component Tests
- Testing Information
- CCDIC Segment Check
- System Performance Test Chart Identification
- System Test Chart Identification
- Fixed Spark Mode (Setting Ignition Timing)
- DFI System Check
- Chart A1 (1 Of 2) - Inoperative "Service Soon" Light
- Chart A1 (2 Of 2) - Inoperative "Service Soon" Light
- Chart A2 - "Service Soon" Light On - No Codes Set
- Chart A3 - No Start Or Stalls After Start
- Chart A4A - Fuel System Diagnosis
- Chart A4B - Fuel Pressure Out Of Range
- Chart A5 (1 Of 2) - Injector System Diagnosis
- CHART A5 (2 of 2) - INJECTOR SYSTEM DIAGNOSIS
- Chart A6 - Oxygen (O2) Sensor Not Ready
- Chart A7 - Lean Exhaust Signal
- Chart A8 - Rich Exhaust Signal
- Chart A9 - Oxygen (O2) Sensor Diagnosis
- DFI Chart B1 - Restricted Exhaust Check
- Chart C1 - ECM Replacement Check
- Chart C3 - Canister Purge Diagnosis
- Chart C4 - Est System Check
- Chart C6 - Air Management Diagnosis
- Chart C7 (1 Of 2) - EGR Diagnosis
- Chart C7 (2 Of 2) - EGR Diagnosis
- Chart C8 (1 Of 2) - VCC Diagnosis
- Chart C8 (2 Of 2) - VCC Diagnosis
- Self-Diagnostic System Check
- Chart B1 - Odometer Power/Ground Problem
- Chart B2 - BCM-To-IPC Communication Problem
- Chart B3 - CCDIC Problem
- Chart B4 - BCM-To-Cps Power/Ground Problem
- Chart B5 - Vacuum Fluorescent Power Supply Problem
- Chart B6 - IPCTO-Cps Power/Ground Problem
- Chart B7 - BCM-To-Cps Wake-Up Signal Problem
- Chart B8 - Power Loss From Cps To Other Components
- Chart C1 - CCDIC Symptom Diagnosis
- Chart C2 - CCDIC Completely Blank
- Chart C3 - CCDIC Display Reads "System Problem"
- Chart C4 - CCDIC Display Reads "System Problem"
- Wiring Diagram
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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