TM 9-6115-730-24
0013
ELECTRONIC TECHNICIAN (ET) TROUBLESHOOTING - Continued
CORRECTIVE ACTION - Continued
NOTE
Do not confuse the Injector Solenoid Test with the Cylinder Cutout Test. The Cylinder Cutout
Test is used while the engine is running. The Injector Solenoid Test is used in order to actuate
the injector solenoids while the engine is stopped.
e. As each solenoid is energized by the ECM an audible click can be heard at
the valve cover. Listen for a click at each valve cover. A black square will
appear over the cylinder number on the Cat ET as each cylinder is being
fired.
f.
Perform the Injector Solenoid Test at least two times.
g. In the previous test step, if the Cylinder Cutout Test indicated a problem with
one of cylinders, there may be a problem with the injector for the cylinder or
there may be a mechanical problem with the cylinder. If a problem with an
injector is suspected, replace the suspect injector with another injector on the
engine in order to confirm the problem. Perform the Cylinder Cutout Test
again. If the problem moves to the other cylinder with the suspect injector,
replace the injector (WP 0118). If the problem remains in the original
cylinder, there is a mechanical problem with the cylinder.
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.
STEP 11.
If the Injector Solenoid Test reported that one or more cylinders are SHORT,
record the cylinder numbers for the injectors that indicate SHORT.
a. On EMCP set ENGINE CONTROL switch to OFF/RESET. Set Battery
Disconnect Switch to OFF. Set DEAD CRANK SWITCH to OFF. A strong
electrical shock hazard is present if the electrical power is not removed from
the ECM
b. Disconnect the connector ENG-P300 from injector harness ENG J300 at the
valve cover.
c.
Set Battery Disconnect Switch to ON. Set DEAD CRANK SWITCH to
NORMAL. On EMCP set ENGINE CONTROL switch to COOL
DOWN/STOP.
d. If the status of all cylinders indicates OPEN when the connector for the
injector harness is disconnected, there is not a short circuit in the Engine
Harness from the ECM connector to the connector for the injector harness.
Reconnect the connector for the injector harness. Proceed to STEP 11.
e. If at least one cylinder does not indicate OPEN when the connector for the
injector harness is disconnected, record the cylinder numbers that indicate a
short circuit.
(1) On EMCP set ENGINE CONTROL switch to OFF/RESET. Set Battery
Disconnect Switch to OFF. Set DEAD CRANK SWITCH to OFF.
0013-18
