DTC P1351: Pcm Detects Open In Ignition Control Circuit: Description

The Ignition Control Module (ICM) has independent power and ground circuits. The circuits between the ICM and PCM consists of Ignition Control (IC) timing signal, IC timing control, low resolution engine speed signal, medium resolution engine signal, camshaft position signal, and low reference signal.

Both the Camshaft Position (CMP) sensor and Crankshaft Position (CKP) sensor signals are input directly to ICM. The ICM sends 3X signals to PCM and controls the timing advance during engine cranking. The timing advance changes to PCM control after PCM receives the second 3X signal and PCM applies 5 volts to IC timing signal circuit.