ELECTRICAL SYSTEM TESTS, INSPECTIONS, AND ADJUSTMENTS - CONTINUED
INJECTOR SOLENOID CIRCUIT TEST
System Operation Description:
Use this procedure for these conditions:
A suspected problem with an injector solenoid.
You have been directed to this procedure from Troubleshooting, Troubleshooting Without a Diagnostic
There is an active diagnostic code for an injector solenoid.
Use this procedure for these diagnostic codes:
1-05 Injector Cylinder 1 open circuit
1-06 Injector Cylinder 1 short
2-05 Injector Cylinder 2 open circuit
2-06 Injector Cylinder 2 short
3-05 Injector Cylinder 3 open circuit
3-06 Injector Cylinder 3 short
4-05 Injector Cylinder 4 open circuit
4-06 Injector Cylinder 4 short
5-05 Injector Cylinder 5 open circuit
5-06 Injector Cylinder 5 short
6-05 Injector Cylinder 6 open circuit
6-06 Injector Cylinder 6 short
Perform this procedure under conditions that are identical to conditions that exist when problem occurs. Typically,
problems with injector solenoid occur when engine is warmed up and/or when engine is under vibration (heavy
These engines have Electronic Fuel Injectors (EFI) that are mechanically actuated and electronically controlled.
ECM sends a 105V pulse to each injector solenoid. Pulse is sent at proper time and at correct duration for a given
engine load and speed. Solenoid is mounted on top of fuel injector body.
If an open circuit is detected in solenoid circuit, a diagnostic code is generated. ECM continues to try to fire injec-
tor. If a short is detected, a diagnostic code is generated. ECM will disable solenoid circuit. ECM will periodically
try to fire injector. If short circuit remains, this sequence of events will be repeated until problem is corrected.
N OT E
Two injector solenoids share a supply wire. For this reason, an open or short circuit in a supply wire could
cause diagnostic codes for two injector solenoids.
When an injector is replaced, you must program new injector trim files into ECM. If ECM is replaced, all injector
trim files must be programmed into new ECM (WP 0057 00).