With Multi-Use Tester (MUT)

SELF-DIAGNOSIS
The ECU monitors the input/output signals (some signals at all times and the others under specified conditions).

When the ECU detects that an irregularity memorize the trouble code, and outputs the signal to the self-diagnosis output terminal.

There are 14 diagnosis items, including the normal state, and the diagnosis results can be read Out with voltmeter or Multi-use tester.

Trouble codes will remain in the ECU as long as battery power is maintained. The trouble codes will, however, be erased when the battery terminal or the engine control unit connector is disconnected.

NOTE: If the sensor connector is disconnected with the ignition switch turned on. the diagnosis code is memorized. In this case. disconnect the battery negative terminal (-) for 15 seconds or more. and the diagnosis memory will be erased.

CHECKING PROCEDURE (SELF-DIAGNOSIS)

NOTE:
1) When battery voltage is low. trouble codes can not be read. Be sure to check the battery for voltage and other conditions before starting the test.
2) Diagnosis memory is erased if the battery or the ECU connector is disconnected. Do not disconnect the battery before the trouble codes are completely read.






Inspection Procedure (Using Multi-Use Tester)
1. Turn OFF the ignition switch.
2. Connect the the multi-use tester to the diagnosis connector in the fuse box.
3. Connect the power-source terminal of the multi-use tester to the cigarette lighter socket.
4. Turn ON the ignition switch.
5. Use the multi-use tester to check the self-diagnosis codes.
6. Repair the faulty part from the diagnosis chart.
7. Erase the malfunction code.

NOTE:

1) Select 4. "SPECIAL TEST" from the function selection menu of the multi-use tester.
2) Then select Item No.5 "ERASE DIAG".
3) Press the YES key when "ERASE DIAG. CODE "?" is displayed.
4) Enter ID code "19".
5) Press the CLEAR key when "FINISHED ERASING DIAG. CODE" is displayed.
6) Read the self-diagnosis output and check output of correct code.






8. Disconnect the multi-use tester.

NOTE: When the ignition key is in the ST position. the cigarette lighter power is OFF. If a test needs to be made during cranking. use the battery clamp harness provided.