Dtc P0351/P0352 Cylinder 1 Or Cylinder 2 Ignition Coil Fault; Circuit Description; Diagnostic Aids - Briggs & Stratton Vanguard EFI 380000 Repair Manual

DTC P0351/P0352 CYLINDER 1 OR CYLINDER 2 IGNITION COIL FAULT

2

Circuit Description

The ECM is connected to the ignition coils to determine
proper fuel injection timing. In some engines, the ECM
also controls the ignition coils for spark timing. In addition
to the two wires used in the standard fixed timing ignition
system, these units can be identified by the presence of a
third wire that connects to ECM terminal J4.
The DTCs indicate which ignition coil is faulty.
When an ignition coil fault is set, the ECM shuts down the
fuel injection to the same cylinder. The engine continues
to run on one cylinder if no fault code is set for the
opposite cylinder.
36

Diagnostic Aids

Check for the following conditions:
1. Poor ECM connection.
2. Inspect wire harness connectors for backed out
terminals, improper mating, broken locks, improperly
formed or damaged terminals, and poor terminal to
wire connection.
3. Damaged wire harness and/or connectors. If harness
appears to be OK, shake or wiggle wire harness
and/or connector with DVOM attached. Radical
voltage changes can indicate the location of the fault
condition.
Always clear DTCs after performing repairs.