Circuit Description

When the module receives a 5-volt signal from the PCM, it provides a ground path for the battery voltage supplied to the ignition primary coil. When the PCM turns off the 5 volts to the module, the module will remove the ground path of the ignition primary coil, causing the magnetic field produced by the coil to collapse. The PCM monitors the circuit and will set DTC P0351 if a problem in the ignition control circuit is detected.

Conditions required to set DTC are:

• Ignition is on.
• Output voltage is not equal to 5 volts when output is on.
• Output voltage is not equal to zero volts when output is off.
• 20 test failures have occurred within 40 samples of continuous circuit monitoring.