Ignition Module Run Mode Test EEC II Models Only

Insert test adapter between wiring harness and ignition module 4-wire connector. See Fig. 6. Connect a scope with clamp-on pick-up to coil secondary wire. If scope is not available, use a modified spark plug attached to coil secondary wire with plug case grounded. See Fig. 7. Turn ignition to "ON" position and ground the diagnostic test wire of adapter. Check for sparks each time wire is removed from ground.
If plug sparks, proceed to Ignition Module Start Mode Test for EEC II vehicles. If plug does not spark, turn ignition switch "ON" and "OFF", checking for sparks each time ignition is turned "OFF". If plug sparks, proceed to step 3). If plug does not spark, proceed to step 4).
Remove test adapter and substitute (but do not install) a known good ignition module and attempt to start vehicle. If vehicle runs, reinstall old module to verify that it was faulty. If so, replace module. If vehicle runs with old module, repeat test procedure.
Turn ignition switch "ON" and measure battery voltage and voltage at ignition module red wire. If voltages are not equal, repair ignition module red wire circuit and attempt again to start vehicle. If vehicle will not start or if battery voltage and red wire voltage were equal, proceed to Ignition Module Final Test. See Fig. 8.