
RENR5622 119
Troubleshooting Section
•
Not OK – A 1-05 to 16-05 is logged. Proceed to
Test Step 4.
•
Not OK – A 1-06 to 16-06 is logged. Proceed to
Test Step 5.
Test Step 3. Perform t he “Cylinder Cutout
Test”
NOTICE
Engine power is reduced when a properly functioning
cylinder is cut out. Make sure that you will not damage
auxiliary or driven equipment if the engine power is
suddenly reduced.
A. Remove power from the ECM.
B. Verify that the ECM connector J2/P2 and the
injector connectors are properly connected.
C. Restore power to the ECM.
D. Start the engine.
E. Apply a load to the engine.
F. Perform the following steps on all suspect
cylinders (solenoids).
G. Use the diagnostic tests on Cat ET to initiate the
“Cylinder Cutout Test”.
H. Run the “Cylinder Cutout Test”. Run the “Cylinder
Cutout Test”. Disable the suspect cylinder(s)
during the test.
Expected Result:
The results indicated that the remaining injectors
used more fuel when the “Cylinder Cutout Test”
disabled the suspect injector(s).
Results:
•
OK – There was a noticeable change in fuel usage.
Repair: The injectors are firing in all cylinders.
Reset the system and check for diagnostic codes.
STOP.
•
Not OK – There was no noticeable change in fuel
usage.
Repair: Verify that the engine valve lash for that
injector is set correctly. Rerun the “Cylinder Cutout
Test”. If the problem is still present, replace the
injector. If the new injector has a trim code that is
different from the old injector, change the trim code
in the ECM.
STOP.
Test Step 4. Check the Harness between
the ECM and the Injector Connectors for
an Open Circuit
This engine uses high voltage to control the fuel
injectors.
Disconnect electronic fuel injector enable circuit
connector to prevent personal injury.
Do not come in contact with the fuel injector ter-
minals while the engine is running.
A. Remove power from the ECM.
B. Disconnect the connectors for the suspect
injector(s).
C. Fabricate a jumper wire 100 mm (4 inch) long with
Deutsch pins on both ends of the wire.
D. Insert one end of the jumper wire into the socket
for the suspect injector’s supply wire. Insert the
other end of the jumper wire into the socket for the
suspect injector’s return wire. This will replace the
injector solenoid with a short circuit.
E. Restore power to the ECM.
Note: This test will help the service technician verify
thattheECMcanfirethesolenoids.Donottryto
manually crank the engine during this test. The ECM
will terminate the “Injector Solenoid Test”.
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 wire.
Expected Result:
Cat ET displays “Open” for the cylinder with the
jumper wire.
Results:
•
OK – Cat ET displays “Open” for the cylinder with
the jumper wire. There is a problem in the wiring
between the ECM and the injector connector.
ProceedtoTestStep6.
•
Not OK – Cat ET displays “Short” for the cylinder
with the jumper wire. The harness between the
ECM and the injector connector does not have an
open circuit. Proceed to Test Step 7.