Key On-Engine Running Self-Test

WARNING: This page is about a different car, the 1984 Ford Ranger, 1984 Ford Cab & Chassis, and 1984 Ford Bronco II. However, it is still accessible from the selected car via links, so may be relevant.

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.

NOTE: If engine will not start, perform TEST A .

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 Key On-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: