TM 9-6115-729-24
0013
ELECTRONIC TECHNICIAN (ET) TROUBLESHOOTING - Continued
CORRECTIVE ACTION - Continued
STEP 8.
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.
(2) Disconnect ENG-P2 from ECM J2.
(3) Remove the suspect injector's supply wire and return from the J2 ECM
connector. Connect the ENG-P2 ECM connector.
(4) Set Battery Disconnect Switch to ON. Set DEAD CRANK SWITCH to
NORMAL. On EMCP set ENGINE CONTROL switch to COOL
DOWN/STOP.
(5) Perform the Injector Solenoid Test at least two times. Record the results.
NOTE
The Cat ET will report an OPEN for the injector that shares the supply with the suspect injector.
Disregard the result for this injector.
(6) If the Injector Solenoid Test indicates OPEN for the suspect cylinder, the
short circuit is in the engine harness. Repair the engine harness or
replace the engine harness, as required (WP 0090). Verify that the repair
eliminates the problem.
(7) If the Injector Solenoid Test indicates SHORT for the suspect cylinder,
there is a problem with the ECM. Replace the ECM (WP 0084). Verify
that the repair eliminates the problem.
0013-39