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 Buick ReattaFACTORY OEM SERVICE PROCEDURE
3.3L/3.8L Component Tests
- Diagnosis & Testing
- Description
- Notes
- Basic Diagnostic Procedure
- Diagnostic Materials
- Diagnostic Charts
- Diagnostic Aids
- Field Service Mode Check (Fuel Injected Models)
- Special Diagnostic Tools
- Scan Tester Usage
- Scan Tester - Test Data Parameters
- Component Location
- ECM Terminal Id (3.3L VIN N, "A" Body)
- ECM Terminal Id (3.3L VIN N, "N" Body)
- ECM Terminal Id (3.3L VIN C, "C" & "H" Bodies)
- Diagnostic Circuit Check
- Chart A1 - No "Service Engine Soon" ("SES") Light
- Chart A2 - Won't Flash Code 12, "SES" Light Always On
- Chart A3 - Engine Cranks But Won't Run
- 3.3L (2 Of 2)
- Chart A5 - Fuel System Elect. Test (3.3L, "A" Body)
- Chart A5 - Fuel System Elect. Test
- Chart A5 - Fuel System Electrical Test
- Chart A7 - Fuel Pressure Test (3.3L "A" Body)
- Fuel Pressure Test (2 Of 3) (3.3L "A" Body)
- Fuel Pressure Test (3 Of 3) (3.3L "A" Body)
- Chart A7 - Fuel Pressure Test (3.3L "N" Body)
- Chart A7 - Fuel Pressure Test (3.8L "C" & "H" Bodies)
- Chart B1 - Restricted Exhaust System Check
- Check At O2 Sensor
- Chart C2A - Injector Balance Test
- Chart C2B - Idle Air Control (3.3L)
- Chart C2B - Idle Air Control (3.8L)
- Chart C3 - Canister Purge Check
- Chart C4H1 - C3I Misfire At Idle (3.3L)
- Chart C4H2 - C3I Misfire Under Load (3.3L)
- Chart C4F1 - C3I Misfire At Idle (3.8L "C" & "H" Bodies)
- Chart C4F2 - C3I Misfire Under Load (3.8L "C" & "H" Bodies)
- Chart C5 - Electronic Spark Control (ESC)
- Chart C7 - Exhaust Gas RECIRCULATION (3.8L)
- Chart C8 - Torque Converter Clutch
- Chart C8B - Torque Converter Clutch
- 3.3L "A" Body With 440-T4 Transmission (2 Of 2)
- Chart C8A - Torque Converter Clutch
- TCC - 3.8L With 440-T4 Transmission (2 Of 2)
- Chart C10 - A/C Clutch Control
- 3.3L "A" Body (2 Of 2)
- Chart C10 - A/C Clutch Control (3.3L "N" Body)
- Chart C10A - A/C Clutch Control
- 3.8L "C" & "H" Bodies (2 Of 2)
- Chart C12A - Cooling Fan Functional Check (3.3L "A" Body)
- Chart C12B - No Cooling Fan(S) (3.3L "A" Body)
- Chart C12C - Cooling Fan(S) Always On (3.3L "A" Body)
- Chart C12A - Cooling Fan Functional Check (3.3L "N" Body)
- Chart C12B - No Cooling Fan (3.3L "N" Body)
- Chart C12C - Cooling Fan Always On (3.3L "N" Body)
- Chart C12A - Cooling Fan Functional Check (3.8L)
- Chart C12B - Cooling Fan Always On (3.8L)
- Chart C12C - No Low Speed Cooling Fan (3.8L)
- Chart C12D - No High Speed Cooling Fan (3.8L)
- Wiring Diagrams
Factory Service Tools
Use the Manual With the Right Hardware
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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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