Ignition System: Testing and Inspection

CIRCUIT DESCRIPTION
The ignition control (IC) module has independent power and ground circuits. The circuits between the IC module and the powertrain control module (PCM) consist of the following circuits:
- The IC timing signal
- The IC timing control
- The low-resolution engine speed signal
- A low reference signal

The IC module sends 3X signals to the PCM. The IC module controls the timing advance during engine cranking. The timing advance changes to PCM control after the following actions:
- The PCM receives the second 3X signal.
- The PCM applies 5-volts to the IC timing signal circuit.

DIAGNOSTIC AIDS
An arcing spark plug wire or an arcing ignition coil to the IC module may cause a stall, misfire or a no start condition. For an intermittent condition refer to Intermittent Conditions Intermittent Conditions

TEST

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