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ENGINE MANAGEMENT SYSTEM - V8 DESCRIPTION AND OPERATION 18-2-41 Input/Output It is possible to test both primary and secondary coils of the ignition coils for resistance using a multimeter as follows: l Expected primary coil resistance: 0.5 ± 0.05 Ω at 20 ° C (68 ° F). l Expected secondary coil resistance: 13.3 ± 1.3 k Ω at 20 ° C (68 ° F). The ECM provides the earth control for each coil on separate pins as follows: LH Bank (cylinders 1, 3, 5, 7) l Cylinder 1 - pin 6 of connector C0638 of the ECM multiplug. l Cylinder 3 - pin 2 of connector C0638 of the ECM multiplug. l Cylinder 5 - pin 8 of connector C0638 of the ECM multiplug. l Cylinder 7 - pin 7 of connector C0638 of the ECM multiplug. RH Bank (cylinders 2, 4, 6, 8) l Cylinder 2 - pin 2 of connector C0638 of the ECM multiplug. l Cylinder 4 - pin 7 of connector C0638 of the ECM multiplug. l Cylinder 6 - pin 6 of connector C0638 of the ECM multiplug. l Cylinder 8 - pin 8 of connector C0638 of the ECM multiplug. The ignition coil can fail the following ways or supply incorrect signal: l Coil open circuit. l Short circuit to vehicle supply. l Short circuit to vehicle earth. l Faulty component. In the event of ignition coil failure any of the following symptoms may be observed: l Engine misfire on specific cylinders. l Engine will not start. |