Part 2 of 2

Chart A-3 Engine Cranks But Won't Run Part 2 Of 2:

Ignition Wiring Schematic:

CIRCUIT DESCRIPTION
If the Tech 1 scan tool did not indicate RPM during cranking, and there is no spark present at the plugs, the problem lies in the direct ignition system or the power ground supplies to the module.

The magnetic crank sensor is used to determine engine crankshaft position much the same way as the pick-up coil did in distributor type systems. The sensor is mounted in the block near a seven slot wheel on the crankshaft. The rotation of the wheel creates a flux change in the sensor which produces a voltage signal. The ignition module then processes this signal and creates the reference pulses needed by the Powertrain Control Module (PCM) and the signal triggers the correct coil at the correct time.

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

1. This test will determine if the B+ supply and a good ground is available at the ignition control module.
2. Tests for continuity of CKT S39 to the ignition control module. If test light does not light but the "Service Engine Soon" light is "ON" with ignition "ON" repair open in CKT 839 between ignition control module and splice.
3. Checks for continuity of the low resolution crankshaft position sensor connections.
4. Voltage will vary in this test depending on cranking speed of engine. The voltage will vary from about 500 mV at very slow cranking speeds, to about 100 mV at high speeds.