Part 2 of 2

Chart C-4M (Part 2 Of 2):

Ignition And Fuel Systems Wiring Schematic:

CIRCUIT DESCRIPTION
The Electronic Ignition (EI) system uses a waste spark method of distribution. In this type of system the electronic Ignition Control Module (ICM) triggers the #1-4 coil pair resulting in both #1 and #4 spark plugs firing at the same time. #1 cylinder is on the compression stroke at the same time #4 is on the exhaust stroke, resulting in a lower energy requirement to fire #4 spark plug. This leaves the remainder of the high voltage to be used to fire #1 spark plug. On this application, the Crankshaft Position (CKP) sensor is mounted to, and protrudes through the block to within approximately 0.050" of the crankshaft reluctor. Since the reluctor is a machined portion of the crankshaft and the sensor is mounted in a fixed position on the block, timing adjustments are not possible or necessary.

CHART TEST DESCRIPTION
Number(s) below refer to circled number(s) on the diagnostic chart.

4. Probing injector harness connector will isolate faulty wiring.

DIAGNOSTIC AIDS
^ A shorted or low resistance injector may cause a miss in the other injector pair (1 & 4 or 2 & 3).
^ If misfire can not be duplicated try spraying a fine mist of water on to the ignition coil, wires, or module.