IGNA23 - Check For Coil (-) Open In Harness

^ Key OFF.

^ Disconnect the PCM.

^ Disconnect diagnostic cable TFI module tee from Ignition Control Module only; leave TFI module tee connected to vehicle harness.

^ Disconnect BAT+ lead of TFI diagnostic cable from battery.

^ DVOM on ohm scale.

^ Measure the resistance between Pin 3 (COIL-) and Pin 4 (TFI2 COIL-).

^ Is resistance less than 5.0 ohms?

YES -- GO to IGNA24. IGNA24 - Check For Coil (-) Circuit Short to Ground

NO -- Service open coil between Ignition Control Module and coil in harness. Remove all test equipment. Reconnect all components. Clear continuous memory. Rerun quick test.