Analog Volt-Ohmmeter (VOM)
1) Turn ignition off. To initiate KOEO self-test, connect a jumper wire between PCM STI terminal of Data Link Connector (DLC) and ground. See Fig 2.
2) Set VOM to 0-20V DC range. Connect positive (+) lead of VOM to PCM STO terminal at DLC and negative (-) test lead to engine ground.
3) Turn ignition on and observe voltmeter. Count voltmeter needle sweeps (between 0-12 volts) to determine code. See Fig 1.
4) If codes are not present, go to step 6). If codes are present, record codes. Turn ignition off, and go to next step.
5) Erase codes from PCM memory. See CLEARING CODES. Repeat step 3) to identify hard faults. If code does not reappear, fault is intermittent. Go to step 8) to begin KOER self-test. If code reappears, indicating hard fault, repair fault as necessary. Refer to appropriate CODE REFERENCE CHART table to determine circuit test to perform. Go to step 7).
6) If engine starts, go to step 8) to begin KOER self-test. If engine does not start, go to appropriate BASIC TESTING article in this section.
7) Repeat step 5) until no code appears. Terminate KOEO self-test by turning ignition off and disconnecting jumper wire from PCM STI terminal and ground. Go to next step to begin KOER self-test.
8) Start and operate engine at 2000 RPM for 3 minutes to ensure HO2S/O2S sensor is operating. Ensure vehicle is at normal operating temperature. Turn ignition off. Jumper PCM STI terminal to ground to activate KOER self-test. Turn ignition on, and wait 10 seconds.
9) Start engine and allow it to idle. Ensure VOM is connected as described in step 2). Record all codes displayed, and repair fault as necessary. Refer to appropriate CODE REFERENCE CHART table to determine circuit test to perform. If no code is present, go to ANALOG VOLT-OHMMETER (VOM) under SWITCH MONITOR TEST.