Diagnostic Aids

DTC P1374 can be caused by secondary components leaking high voltage into the IC module. Check for incorrect harness routing near secondary ignition components. Inspect ignition coils for arcing to wiring harness or IC module. Inspect ignition coils for cracks, carbon tracking or other signs of damage. Check secondary ignition wires for arcing to wiring harness. If DTC is determined to be intermittent, see INTERMITTENT TROUBLE CODE DETERMINATION  under SELF-DIAGNOSTIC SYSTEM.