Injector Solenoid Circuit - Test - Perkins 1106D Troubleshooting Manual

156
Troubleshooting Section
Repair: Repeat the test procedure from Test Step
1.
STOP.

Injector Solenoid Circuit - Test

System Operation Description:
Use this procedure to troubleshoot any suspect faults
with the injector solenoids.
Use this procedure for the following diagnostic codes:
•
1-5 Cylinder #1 Injector open circuit
•
1-6 Cylinder #1 Injector short
•
2-5 Cylinder #2 Injector open circuit
•
2-6 Cylinder #2 Injector short
•
3-5 Cylinder #3 Injector open circuit
•
3-6 Cylinder #3 Injector short
•
4-5 Cylinder #4 Injector open circuit
•
4-6 Cylinder #4 Injector short
• 5-5 Cylinder #5 Injector open circuit
•
5-6 Cylinder #5 Injector short
•
6-5 Cylinder #6 Injector open circuit
•
6-6 Cylinder #6 Injector short
Perform this procedure under conditions that are
identical to the conditions that exist when the fault
occurs. Typically, faults with the injector solenoid
occur when the engine is warmed up and/or when
the engine is under vibration (heavy loads).
These engines have Electronic Unit Injectors (EUI)
that are mechanically actuated and electronically
controlled. The Electronic Control Module (ECM)
sends a 70 volt pulse to each injector solenoid. The
pulse is sent at the correct time and at the correct
duration for a given engine load and speed. The
solenoid is mounted on top of the fuel injector body.
This document is printed from SPI². Not for RESALE
If an open is detected in the solenoid circuit, a
diagnostic code is generated. The ECM continues
to try to fire the injector. If a short is detected, a
diagnostic code is generated. The ECM will disable
the solenoid circuit. The ECM will periodically try
to fire the injector. If the short circuit remains this
i03813911
sequence of events will be repeated until the fault
is corrected.
"Injector Solenoid Test"
Use the "Injector Solenoid Test" on the electronic
service tool to aid in diagnosing an open circuit or
a short circuit diagnostic code while the engine is
not running. 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". Due to the use of a shared supply,
a short circuit in the wire that is used as a supply
for the injector solenoid will cause three cylinders to
have diagnostic codes.
"Cylinder Cutout Test"
Use the "Cylinder Cutout Test" on the electronic
service tool to diagnose a malfunctioning injector
while the engine is running. All active diagnostic
codes must be repaired before running the "Cylinder
Cutout Test". When a good injector is cut out,
the "Fuel Position" should change. The change in
the fuel position is caused by the other injectors
that are compensating for the cut out injector. If a
malfunctioning injector is cut out, the "Fuel Position"
will not change. The "Cylinder Cutout Test" is used to
isolate the malfunctioning injector in order to avoid
replacement of good injectors.
Illustration 55
Typical example of the fuel injector
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