With Manufacturer's Scan Tool

HOW TO DISPLAY AND READ DIAGNOSTIC TROUBLE CODES WITH MULTI-USE TESTER (MUT)

CAUTION:
1) If the battery voltage is low, no trouble codes will be stored. Be sure to check the battery voltage before starting the test.
2) Diagnostic codes will be erased if the battery or the ECU harness is disconnected. Do not disconnect the battery before the diagnostic codes are read.
3) After checks and repairs are completed, disconnect the (-) ground cable for 15 seconds or more to make sure that the codes are erased.

1. Turn the ignition switch OFF.
2. Connect the harness connector of the multi-use tester to the diagnostic connector in the fuse box.




3. Connect the power-source terminal of the multi-use tester to the cigarette lighter socket.
4. Turn the ignition switch ON.
5. Use the multi-use tester to check the self-diagnostic codes.
6. After completion of the repair, turn the ignition switch OFF; then disconnect the battery negative terminal for 15 seconds. Then, check that no malfunction codes are displayed with the multi-use tester.
7. Disconnect the multi-use tester.




NOTE: If a test is to be made during cranking, the power to the cigarette lighter will be interrupted. Therefore, use the separate battery harness for the multi-use tester.

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DIAGNOSIS CHARTS

**TSB # 9113003, DATED FEBRUARY 1991
There are two different wiring harnesses used on this vehicle. A poor connection at a crimp may be causing the check engine light to come on. Refer to the TSB for further information.