Chart C-4 HEI System Check

PFI Chart C-4:

PFI HEI Circuit:

Chart C-4A:

DESCRIPTION:

The HEI performance test checks the operation of the control circuits and ground plane of the module. CKT 453 forms the ground plane for the module. High resistance in this circuit can cause an interruption in the transmission of the signal. The module is dependant on the pick up coil to generate the alternating current signal that it processes into a square wave signal sent to the PCM/ECM. If the pick up coil fails to generate a voltage signal the module cannot produce a reference signal to the PCM/ECM. Attention should be paid to the pick up coil leads. An intermittent open in the pick up coil circuit can cause no start and stall conditions.

NOTES ON FAULT TREE:

1. Use essential tool J35616 to make necessary jumpers.

2. Manipulate the green and white leads of the pick up coil when checking with the Ohmmeter.

3. Check the ground at the generator and the grounding screw at the harness block.