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 - ECMMANUAL OPERATION OF SERVICE MODESYSTEM SELECTION
1990 Buick Reatta 2D Convertible, 4T60/ME9
System Selection
1990 Buick Reatta 2D Convertible, 4T60/ME9SECTION System Selection
- After all trouble codes have been displayed, the SERVICE MODE system can be directed to perform specific system diagnostic tests. See DISPLAYING TROUBLE CODES in this article. Following the trouble code display, the first system available for testing will automatically be displayed. For example: ECM? may now be present on the display.
- To select the desired system, (ECM, BCM, IPC, or SIR), advance and stop the DIC display as follows: Depressing the FAN DOWN button on the ECCP will cycle the system selection list. When the desired diagnostic system is displayed, depress FAN UP button on ECCP and the displayed system will be selected for testing.
- Depressing BI-LEV button on ECCP will exit diagnostics and return to normal IPC and ECCP operation.
NOTE:
To cancel a system selection and activate a repeat of the system selection process, depress the OFF button on the ECCP.
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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.