Key On Engine Off (KOEO) Self Test

Fig. 37 Key-ON, Engine-OFF self-test output codes:

1. Connect voltmeter onto engine as described previously.
2. Set voltmeter to the 0 to 15 volt scale.
3. Connect jumper wire from the No. 2 pin on the self-test connector to the self-test input connector.
4. Turn ignition switch to ON position.
5. With the system inputs satisfactory for hard and/or intermittent faults, service codes obtained will be as follows:
a. Voltmeter will fluctuate from zero to three volts for the fast codes.
b. The voltmeter sweeps twice, with a two second pause in between, representing a code 11. The code 11 will be repeated once.
c. A six second pause is next, followed by a single sweep of the voltmeter needle representing the separator code. Another six second pause follows the separator code.
d. Finally the code 11 will be represented twice, with a four second pause. Refer to Fig. 37 for Key-ON/Engine-OFF self-test output code.