TM 9-6115-729-24
0013
ELECTRONIC TECHNICIAN (ET) TROUBLESHOOTING - Continued
CORRECTIVE ACTION - Continued
i.
If the Injector Solenoid Test indicates open for the cylinder with the jumper
wire. The problem is in the engine harness or in the ECM.
(1) If the problem has not been resolved, repair or replace the engine
harness (WP 0090). Verify the problem has been resolved.
(2) Install another ECM and retest. If the problem is resolved, install a
replacement ECM (WP 0084).
STEP 10.
If the problem is not resolved, check the injector harness under the valve cover
for open or short circuits in the injector wires.
WARNING
A strong electrical shock hazard is present if the electrical power is not removed from the ECM.
The electronic unit injector system uses 90-120 volts.
a. On EMCP set ENGINE CONTROL switch to OFF/RESET. Set Battery
Disconnect Switch to OFF. Set DEAD CRANK SWITCH to OFF.
b. Remove the valve cover (WP 0101).
c.
Disconnect the connector for the problem injector.
d. Attach a jumper wire to both terminals at the harness side of injector
connector for the suspect injector (WP 0090, Figure 2, sheet 3).
e. Set Battery Disconnect Switch to ON. Set DEAD CRANK SWITCH to
NORMAL. On EMCP set ENGINE CONTROL switch to COOL
DOWN/STOP.
f.
Perform the Injector Solenoid Test at least two times. Record the results of
the test.
NOTE
The Cat ET may report a SHORT for the injector that shares the supply with the suspect
injector. Disregard the result for this injector.
g. On EMCP set ENGINE CONTROL switch to OFF/RESET. Set Battery
Disconnect Switch to OFF. Set DEAD CRANK SWITCH to OFF.
(1) If the Injection Solenoid Test indicates SHORT for the cylinder with the
suspect injector, the harness under the valve cover is OK. The problem
is in the windings of the injector solenoid. Replace the injector
(2) If the Injection Solenoid Test does not report SHORT for the suspect
injector, the problem appears to be in the harness under the valve cover.
Repair or replace the harness under the valve cover (WP 0090). Run the
Injector Solenoid Test in order to check the installation of the new
harness before installing the valve covers. Verify that the repair
eliminates the problem.
0013-42
