DTC P1351: Ic Circuit Open: Description

The Engine Control Module (ECM) controls spark timing and dwell under all engine running conditions. The Ignition Control Module (ICM) has the ability to charge discharge the coil packs based on ECM control. The ECM uses a high control signal of near 5 volts to charge up the coil and a low control signal of near zero volts to discharge the coil. If the coil is charged and the control signal is low, the coil will fire through its secondary towers. During engine crank, the ECM will pulse the Ignition Control (IC) timing control circuit high and low to test for faults in the IC timing control circuit. If the ECM detects an open or a short to voltage in IC timing control circuit, DTC P1351 sets.