Key On Engine Running (KOEO) Self-test
This test checks sensors under actual operating conditions and at normal operating temperature. Any faults must be present at time of test to be detected.
Connect jumper wire or STAR tester to activate test. This test will display an Engine ID code, a Dynamic Response code and an On Demand Service code. After a Dynamic Response code (single digit) is received, quickly press and release accelerator once only.
Deactivate the self-test. Start and run engine at more than 2000 RPM for 2 minutes. Turn engine off and wait 10 seconds. Activate self-test. Start engine. Test will proceed with Engine ID code, Dynamic Response code and Engine Running On Demand Service codes. If a 10 or 1 pulse occurs during Dynamic Response code, open throttle wide open momentarily. Record codes and proceed as follows:
| On Demand Codes | Proceed to Test | ||
|---|---|---|---|
| 11 | (1) CONTINUOUS TEST | ||
| Any | See Code No. Below | ||
| None | Repeat self-test; then Test I | ||
| 12 | Test L | ||
| 13 | Test L, step 11) | ||
| 21 | Test D | ||
| 22 | Test E | ||
| 23 | Test F | ||
| 41, 42, 43 | Test K | ||
| 44, 45, 46 | Test N | ||
| 58 | Test H | ||
| 72 | Test E | ||
| 73 | Test F, step 16) | ||
| 77 | Test O | ||
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