TM 9-6115-730-24
0013
ELECTRONIC TECHNICIAN (ET) TROUBLESHOOTING - Continued
CORRECTIVE ACTION - Continued
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. Failure to comply can cause injury or death
to personnel.
a. On EMCP set ENGINE CONTROL switch to OFF/RESET. Set Battery
Disconnect Switch to OFF. Set DEAD CRANK SWITCH to OFF.
b. Remove valve covers (WP 0100).
c.
Disconnect the connector for the problem injector.
d. Attach a jumper wire to both terminals at the harness side of the injector
connector for the suspect injector (WP 0088, Figure 2, sheet 2).
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 0088). 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.
h. If the short condition was not present, remove the jumper wire and place the
connector in a place that will not allow arcing during the test.
i.
Set Battery Disconnect Switch to ON. Set DEAD CRANK SWITCH to
NORMAL. On EMCP set ENGINE CONTROL switch to COOL
DOWN/STOP.
0013-21
