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Vehicle enters Fast Idle mode, but does not maintain proper RPM Verify proper part # of AFIS Module. AFIS501G-54 – Ford 5.4L engine. AFIS501G-68 – Ford 6.8L engine. AFIS502CNG-54 – Ford 5.4 CNG Engine Use of the incorrect module for the vehicle application will cause incorrect RPM. To aid in troubleshooting intermittent concerns, the AFIS system stores the last five Fast Idle Stop Codes in non volatile memory. Thus if a Fast Idle operation terminates unexpectedly, the technician can determine the cause. To initiate this feature, turn on vehicle ignition, wait until LED’s proveout, and then press and hold the manual engage switch continuously for at least five seconds. The red and green LED’s will flash after 5 seconds. Release the switch and the five most recent stop codes will be read sequentially from the most recent to the oldest, Vehicle “Service Engine Soon Lamp” is illuminated. Verify all connections are fully engaged. Ensure that AFIS Auxiliary module is plugged into AFIS harness. Verify AFIS connections were not disconnected with vehicle ignition on.
Tags : cng engines, ford econoline, non volatile memory, afis system, vehicle application, system diagnostics, econoline, 8l, 4l, rpm, ford
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