Electronic Ignition System Diagnosis (3.4L): Description
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Ignition Control (IC) module has independent power and ground circuits. Circuits between IC module and Powertrain Control Module (PCM) consist of the following circuits:
- IC timing signal.
- IC timing control.
- Low-resolution engine speed signal.
- Low reference signal.
IC module sends 3x signals to PCM. IC module controls timing advance during engine cranking. Timing advance changes to PCM control after the following actions:
- PCM receives the second 3x signal.
- PCM applies 5 volts to IC timing signal circuit.
- Timing advance switches to PCM control.