SUPPORT 4L3745 - Caterpillar

Illustration 2 g01322701
Harness connector for an injector
Table 3
Code Connection for the Jumper
1-5 or -6
through 6- 5 or -6 Terminal 1 and Terminal 3
2602-5 or -6
through 2612-5 or -6 Terminal 2 and Terminal 4
Table 4
Troubleshooting Test Steps Values Results
7. Check the Injector Harness under the Valve Cover for an Open Circuit
A. Turn the keyswitch to the OFF position. A strong electrical shock hazard is present if the keyswitch is not turned off.
B. Remove electrical power from the engine ECM.
C. Determine the appropriate terminals for the solenoid with the code. Refer to Table 3 for the proper terminal connections. Connect a jumper wire between the terminal for the supply and the terminal for the return. The jumper wire will replace the injector solenoid with a short circuit.
D. Turn the keyswitch ON.
E. Activate the "Injector Solenoid Test". Allow the Injector Solenoid Test to continue until each solenoid is activated at least two times.
Short circuit detected
Result: Cat ET displays "Short " for the connector that has the jumper wire. The wiring is OK.
Proceed to Test Step 8.
Result: Cat ET displays "Open " for the connector that has the jumper wire.
The wiring has an open.
Repair the harness or replace the harness under the valve cover. Perform an injector solenoid test in order to verify that the problem is resolved.
8. Check the ECM for Proper Operation
A. Turn the keyswitch OFF. A strong electrical shock hazard is present if the keyswitch is not turned off.
B. Disconnect the P2 connector.
When the P2 connector is disconnected, numerous diagnostic codes will be generated when the keyswitch is turned ON. The codes are normal. Ignore the codes. Reset all active codes and clear all logged codes after you complete this Test Step.
C. Turn the keyswitch ON.
D. Activate the "Injector Solenoid Test". Allow the Injector Solenoid Test to continue until each solenoid is activated at least two times.
E. Turn the keyswitch OFF. A strong electrical shock hazard is present if the keyswitch is not turned off.
F. Use a jumper wire in order to create a short circuit on J2 between the terminals for the solenoids supply and the solenoids return.
G. Turn the keyswitch ON.
H. Activate the Injector Solenoid Test. Allow the Injector Solenoid Test to continue until each solenoid is activated at least two times.
Short and open detected
Result: Cat ET displays "Short" for the solenoid with the jumper wire. Cat ET will display "Open" when the P2 connector is not connected to the ECM.
The problem is in the injector.
Replace the injector. Perform an injector solenoid test in order to verify that the problem is resolved.
Result: Cat ET does not display "Short" for the solenoid with the jumper wire. Cat ET does not display "Open" when P2 is not connected to the ECM.
Perform the following procedure:
1. Temporarily connect a test ECM. Refer to Troubleshooting, "Test ECM Mode".
2. Activate the "Injector Solenoid Test". Allow the Injector Solenoid Test to continue until each solenoid is activated at least two times.
If the test ECM fixes the problem, connect the suspect ECM. If the problem returns