Circuit Description

The engine control module (ECM) provides a ground for the ignition coil (IC) control circuits. When the ECM removes the ground path of the ignition primary coil, the magnetic field produced by the coil collapses. The collapsing magnetic field produces a voltage in the secondary coil which ignites the spark plugs. The sequencing and timing are controlled by the ECM. The ignition 1 voltage is directly supplied to the ignition coil from the ECM. The IC circuits are directly connected to the ECM from the ignition coil. The ignition coil consists of the following circuits:

• The ignition 1 voltage
• The IC 1 and 4 control
• The IC 2 and 3 control

If the ECM detects an incorrect signal in the IC circuits, DTCs P0351 or P0352 sets.