Ignition System Check - With Enhanced Ignition System

Enhanced Ignition System Check:

Enhanced Ignition System Check (Part 2 Of 2):

Igntion System Circuit Chart:

SYSTEM DESCRIPTION
This system includes the distributor, Camshaft Position Sensor (CMP) ignition coil/coil driver, secondary wires, spark plugs, Knock Sensor (KS)s and crank sensors. The ignition system is controlled by the Vehicle Control Module (VCM-A). The VCM-A monitors information from various engine sensors, computes the desired spark timing and controls the dwell and firing of the ignition coil via an Ignition Control (IC) line to the coil driver.

CHART TEST DESCRIPTION
Numbers below refer to circled numbers(s) on the diagnostic chart.

1. The battery should be fully charged prior to any tests. (Perform On-Board Diagnostics (OBD) system check before proceeding unless it was already performed.) To disconnect the tachometer lead, it will be necessary to disconnect the gray ignition coil connector from the ignition coil and jumper the "B" terminal of the harness connector to the "B" terminal of the ignition coil using a fused jumper and terminal test adapter kit J 35616-A.
2. Checks for proper output from the Enhanced ignition system. The spark tester requires a minimum of 25,000 volts to fire. This check can be used in case of an ignition miss, because the system may provide enough voltage to run the engine but not enough to fire a spark plug under heavy load. This test will also separate the distributor cap, rotor and ignition wires from the ignition coil to help identify a secondary ignition system problem.
3. This will determine if the proper available voltage exists in the primary ignition circuit. Also checks ignition coil and wiring.
4. This check will begin to determine if the VCM-A is providing a signal to the ignition coil module or not. If the VCM-A is not providing a signal to the ignition coil driver module, the problem exists between the distributor and VCM-A.
5. This test checks the coil driver module, connections and wiring.
6. This test checks the wiring from the VCM-A to the coil driver module and finally the VCM-A.