Perkins 1106D Troubleshooting Manual page 160

160
Troubleshooting Section
Note: Do not confuse the "Injector Solenoid Test"
with the "Cylinder Cutout Test". The "Cylinder Cutout
Test" is used to shut off fuel to a specific cylinder
while the engine is running. The "Injector Solenoid
Test" is used to actuate the injector solenoids while
the engine is not running. This allows the click of the
injector solenoids to be heard while the engine is off
in order to determine that the circuit is functioning
correctly.
G. As each solenoid is energized by the ECM, an
audible click can be heard at the valve cover.
H. Perform the "Injector Solenoid Test" at least two
times.
Expected Result:
All cylinders indicate "OK".
Results:
•
OK – There is not an electronic fault with the
injectors at this time.
Repair: If the "Cylinder Cutout Test" returned a
"Not OK" for any injector, refer to Troubleshooting,
"Engine Misfires, Runs Rough or Is Unstable".
STOP.
•
Open – Note the cylinders that indicate "Open".
Proceed to Test Step 5.
•
Short – Note the cylinders that indicate "Short".
Proceed to Test Step 8.
Test Step 5. Check the Harness between
the ECM and the Valve Cover Base for an
Open Circuit
Electrical shock hazard. The electronic unit injec-
tor system uses 67-73 volts.
A. Turn the keyswitch to the OFF position. A strong
electrical shock hazard is present if the keyswitch
is not turned OFF.
B. Disconnect the connectors from the valve cover
base.
C. Turn the keyswitch to the ON position.
D. Fabricate a jumper wire 100 mm (4 inch) long with
terminals on both ends of the wire.
E. Insert one end of the jumper wire into the supply
terminal for the suspect injector. Insert the other
end of the jumper wire into the return terminal for
the suspect injector.
This document is printed from SPI². Not for RESALE
F. Perform the "Injector Solenoid Test" at least two
times.
G. Repeat this test for each suspect injector. Stop
the "Injector Solenoid Test" before handling the
jumper wires.
Expected Result:
The electronic service tool displays "Short" for the
cylinder with the jumper wire.
Results:
•
OK – The harness between the ECM and the
valve cover base is OK. Proceed to Test Step 6.
•
Not OK – There is a fault between the ECM and
the valve cover base. Proceed to Test Step 7.
Test Step 6. Check the Injector Harness
Under the Valve Cover
Electrical shock hazard. The electronic unit injec-
tor system uses 67-73 volts.
A. Turn the keyswitch to the OFF position. A strong
electrical shock hazard is present if the keyswitch
is not turned OFF.
B. Remove the valve cover.
C. Disconnect the harness from the suspect injector.
Disconnect the harness from the injectors that
shares the same supply circuit as the suspect
injector.
Note: Injectors 1, 2, and 3 share a common injector
driver circuit in the ECM. Injectors 4, 5, and 6 share
a common injector driver circuit in the ECM. If three
injectors that share a common supply indicate
"Open", the open circuit is probably caused by a
faulty ECM.
D. Thoroughly clean the terminals on three injectors
and on the harness connectors.
E. Exchange the harness between two of the three
injectors that share the common driver.
F. Turn the keyswitch to the ON position.
G. Perform the "Injector Solenoid Test" at least two
times.
Expected Result:
Exchanging the harness between the two injectors
caused the fault to move to the other injector.
KENR6201-01