Without Scan Tool

1. Use the special tool (diagnostic trouble code check harness) to connect an analog-type voltmeter to the diagnostic output terminal [terminal (25)] and to the ground terminal [terminal (4) or (5)] of the data link connector.
2. Turn the ignition switch to ON.
3. Read the diagnostic code pattern from the voltmeter and record it.
4. Referring to the diagnostic chart, repair the defective part.
5. Erase the diagnostic trouble code using the following procedure:

1. Turn the ignition switch to OFF.
2. Disconnect the negative battery cable from the battery terminal for 10 seconds or more and then reconnect it.
3. Turn the ignition switch to ON and take a reading of the diagnostic output to check that a normal code is output.