Test N: Step 15

15) Continuous Memory Code 45: Check Continuity of Coil Circuits From EDIS To Coil Pack Code 45 indicates a fault has been detected by the processor in one of the three coils contained in the ignition coil pack.

NOTE: Code 45 refers to faults detected in the circuits related to coils 3, 1 or 2 respectively. Coil 1 provides voltage for cylinder three and four spark plugs. Coil 2 provides voltage for cylinder two and six spark plugs. Coil 3 provides voltage for cylinder one and five spark plugs. The IDM pulse train contains a corresponding pulse for each operating coil. In the event that a coil fails, the corresponding pulse will be absent from the IDM pulse train.

Possible causes for Code 45 are:

Open in coil circuit from EDIS module to coil.
Shorts to coil circuit GND or PWR in EDIS module.

Turn ignition key off and wait 10 seconds. Disconnect DIS module. Set DVOM to 200 ohm scale. Measure resistance between pin 10 at the EDIS module and the coil 1 pin at the ignition coil pack. Measure resistance between pin 11 at the EDIS module and the coil 2 pin at the ignition coil pack. Measure resistance between pin 12 at the EDIS module and the coil 3 pin at the ignition coil pack. If each resistance measurement is less than 5 ohms, go to TEST N: STEP 16. If each resistance measurement is not less than 5 ohms, repair indicated open circuit, reconnect all components and rerun QUICK TEST.