E023 Part 2 of 2

Diagnostic Chart.:

Wiring Diagram.:

NOTES ON FAULT TREE:

5. Checking for HEI module able to recognize a voltage on the bypass circuit and to stop grounding EST (PCM/ECM controlling timing).

6. Checking for bypass signal to the module. If bypass is being sent by the PCM/ECM to the HEI and if the module is interpreting bypass voltage correctly, then the module will switch off the ground to the EST.

7. If the chart leads to "EST circuit is OK" then a fault may exist in the 6 way weatherpack. Check for proper connector mating and for pins backing out of the weatherpack. If the connector is no trouble found, reconnect the six way connector, clear codes and retest.