KENR6933 161
Troubleshooting Section
These engines have Electronic Unit Injectors (EUI)
that are mechan
ically actuated and electronically
controlled. The Electronic Control Module (ECM)
sends a pulse to each injector solenoid. The pulse is
sent at the cor
rect time and at the correct duration
for a given engine load and speed. The solenoid is
mounted on top of the fuel injector body.
If an open circuit is detected in the solenoid, a
diagnostic code is generated. The ECM continues to
try to fire the
injector. If a short circuit is detected, a
diagnostic code is generated. The ECM will disable
the solenoid circuit. The ECM will periodically try
to fire the in
jector.Iftheshortcircuitremains,this
sequence of events will be repeated until the fault
is corrected.
“Injector Solenoid Test”
Use the “Inj
ector Solenoid Test” on the electronic
servicetooltoaidindiagnosinganopencircuitor
a short circuit diagnostic code while the engine is
not runnin
g. The “Injector Solenoid Test” will send
a signal to each solenoid. The electronic service
tool will indicate the status of the solenoid as “OK”,
“Open”, or
“Short”.
Note: On six cylinder engines, the use of a shared
supply wi
ll mean that a short circuit in the wire that is
used as a supply for the injector solenoid will cause
three cylinders to have diagnostic codes.
g01336666
Illustration 60
Typical example of the fuel injector
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