ELECTRONIC TECHNICIAN (ET) TROUBLESHOOTING - Continued
SYMPTOM - Continued
Injector Solenoid Test
Use the Injector Solenoid Test to aid in diagnosing an open circuit or a short circuit while the engine is not
running. The Injector Solenoid Test briefly activates each solenoid. A good solenoid will create an audible click
when the solenoid is activated. The Cat ET will indicate the status of the solenoid as OK, Open, or Short.
Two injector solenoids share a common return wire (Figure FO-2, sheet 2). For this reason, an
open circuit or a short circuit in a return wire could cause diagnostic codes for two injector
Cylinder 1 - 6 Injector Solenoids. Failure mode is not identifiable (Mechanical Failure).
On EMCP set ENGINE CONTROL switch to OFF/RESET. Set Battery
Disconnect Switch to OFF. Set DEAD CRANK SWITCH to OFF.
Prepare for running the Cylinder Cutout Test on the Cat ET.
a. Disconnect harness connector ENG-J1 from ECM.
b. Lift backshell from the side where contact position 47 is located.
Fabricate a jumper using approximately 3 feet of 18 gauge wire and 1 contact (p/n 88-21943).
Install contact of jumper wire into ENG-J1 position 47.
d. Connect and secure other end of jumper wire to any GROUND location.
e. Reconnect ENG-J1 to ECM.
Set Battery Disconnect Switch to ON. Set DEAD CRANK SWITCH to
NORMAL. On EMCP set ENGINE CONTROL switch to COOL
g. On GSC, set OP6, SP05 to 1, to disable low speed shutdown
h. Shut off all parasitic loads which could affect the results of the test.