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 MANUALSOLDSMOBILE1987FIRENZA S, 2.0 K, STANDARDREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEM2.8L PFI TESTS W/CODES
1987 Oldsmobile Firenza S, 2.0 K, Standard
2.8L PFI Tests W/Codes
1987 Oldsmobile Firenza S, 2.0 K, StandardSECTION 2.8L PFI Tests W/Codes
- Model Identification
- Description
- Operation
- Diagnosis & Testing
- Scan Tester Usage
- Diagnostic Charts
- Diagnostic Circuit Check
- Chart A1 - No "Service Engine Soon" ("SES") Light
- Chart A2 - No ALDL/Won't Flash Code 12 "SES" Light On Steady
- Chart A3 - Cranks/Won't Run
- Chart A7 - Fuel System Diagnosis
- Chart B1 - Restricted Exhaust System Check
- Code 13 - Open Oxygen Sensor Circuit
- Code 14 - Coolant Temperature Sensor (Cts) Signal Voltage Low
- Code 15 - Cts Signal Voltage High
- Code 21 - TPS Signal Voltage High
- Code 22 - Throttle Position Sensor Signal Voltage Low
- Code 23 - Mat Sensor (Low Temperature Indicated)
- Code 24 - VSS
- Code 25 - Manifold Air Temperature Sensor Signal Voltage Low
- Code 33 - Map Sensor Signal High
- Code 34 - Map Sensor Voltage Low
- Code 35 - Idle Speed Error
- Code 41 - CYL Select Error
- Code 42 - Est (W/Dis)
- Code 43 - ESC
- Code 44 - Lean Exhaust Indication
- Code 45 - Rich Exhaust Indication
- Code 52 - CALPAK Error
- Code 53 - System OVERVOLTAGE
- Code 54 - Fuel Pump Voltage Low
- Code 61 - Degraded O2 Sensor
- Code 63 - Map Sensor Voltage High
- Code 64, Map Sensor Voltage Low
- Component Check (C Charts)
- Chart C1A - Park/Neutral Switch
- Chart C1D - Map Output Check
- Chart C1E - PSPS Check
- Chart C2A - Injector Balance Test
- Chart C3 - Canister Purge Check
- Chart C4 - IGN Misfire (W/ Dis)
- Chart C5 - ESC
- Chart C7 - EGR Check
- Chart C8A - TCC
- Chart C8C - Shift Indicator
- Chart C10 - A/C Clutch Control
- Chart C12 - Cooling Fan CKT (1 Of 2)
- Chart C12 - Cooling Fan CKT (2 Of 2)
- Component Locations
- ECM Terminal Identification
- Wiring Diagrams
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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.