IGNITION CONTROL (IC) CIRCUIT OPEN
Ignition Control Module (ICM) sends signals that PCM requires
for fuel control and spark advance calculations. At start of engine
crank, ICM controls spark advance (by-pass mode). When second 3X
signal is recognized by PCM, it applies 5 volts to by-pass circuit,
commanding ICM to switch Ignition Control (IC) of spark advance to PCM
(IC mode). An open in IC circuit, or a short to voltage in by-pass
circuit will set DTC 1351.
You likely won't notice any drivability problems.
- PCM detects open circuit in by-pass circuit.