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 MANUALSBUICK1990REATTA 2D CONVERTIBLE, 4T60/ME9REPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - TESTS W/CODES - ECM
1990 Buick Reatta 2D Convertible, 4T60/ME9
Engine Controls - Tests W/Codes - ECM
1990 Buick Reatta 2D Convertible, 4T60/ME9SECTION Engine Controls - Tests W/Codes - ECM
- Entering Self-Diagnostics
- Clearing Trouble Codes
- Manual Operation Of Service Mode
- Diagnostic Charts
- Self-Diagnostic System Check
- Chart A-1, No Service Engine Soon Light
- Chart A-2: "Service Engine Soon" Light Won't Go Out Or Flash
- Code E013: Open Oxygen Sensor Circuit
- Code E014: Coolant Temp Sensor Too High
- Code E015: Coolant Temp Sensor Too Low
- Code E016, Battery Voltage Too High
- Code E021: TPS Signal Voltage High
- Code E022: TPS Signal Voltage Low
- Code E023: Mat Sensor Signal Voltage High
- Code E024: Vehicle Speed Sensor (VSS) Circuit
- Code E025: Mat Sensor Circuit (High Temp Indicated)
- Code E026: Quad-Driver (QDM) Error
- Codes E027, E028 & E029, 2ND, 3RD & 4TH Gear Switch Diagnosis
- Code E031: Park/Neutral Switch Circuit
- Code E034: Mass Airflow Sensor Circuit
- Code E038: Brake Switch Circuit
- Code E039: Torque Converter Clutch (TCC) Circuit
- Code E041: Cam Sensor Circuit
- Code E042, Est Ignition Circuit
- Code E043: Electronic Spark Control (ESC) Circuit
- Code E044: O2 Sensor Circuit (Lean Exhaust Indicated)
- Code E045: O2 Sensor Circuit (Rich Exhaust Indicated)
- Code E046: Power Steering Pressure Switch Circuit
- Code E047: ECM-BCM Data
- Code E048: Misfire Diagnosis
- Code E051: Mem-Cal Error
- Code E058: Vehicle Anti-Theft System (Vats) Fuel Enable
- Codes E063, E064 & E065: Exhaust EGR Circuit
RENDER: 1.0x
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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.