PUMP GP-FUEL INJECTION 4W6036 - Caterpillar

Illustration 1 g06076740Note: The diagram above is a simplified schematic of the Implement ECM and Transmission ECM Data Link connections. The schematic is electrically correct. However, not all of the possible harness connectors are shown. Refer to the latest revision of Electrical System Schematic, UENR6723.Diagnostic Trouble Code Procedure
Note: Prior to beginning this procedure, inspect the harness connectors that are involved in this circuit. Poor connections can often be the cause of a problem in an electrical circuit. Verify that all connections in the circuit are clean, secure, and in good condition. If a problem with a connection is found, correct the problem and verify that the diagnostic code is active before performing a troubleshooting procedure.
Table 3
Troubleshooting Test Steps Values Results
1. Identify The Active FMI Code Associated With The CAN Data Link
Code present FMI 9, proceed to Test Step 2.
FMI 12 , proceed to Test Step 5.
FMI 14 , proceed to Test Step 7.
Begin Process For FMI 9 Troubleshooting HERE
2. Check The Data Link For An Open
A. Turn the key switch and the battery disconnect switch to the OFF position.
B. Disconnect the machine harness connector from the ECM.
C. At the disconnected connector for the ECM, connect a jumper wire between CAN positive contact and CAN negative contact.
D. Measure the resistance from the ECM.
The resistance measure less than 5 ohms. OK - The resistance is less than 5 ohms .
Proceed to Test Step 3.
NOT OK -The resistance measurement is greater than 5 ohms.
Repair: Repair or replace the machine harness.
Proceed to Test Step 6.
3. Check The Resistance Of The Data Link
A. Turn key start switch and disconnect switch OFF.
B. Disconnect the machine harness connector from the ECM.
C. At the disconnected harness connector of the ECM, measure the resistance between CAN positive contact and CAN negative contact.
The resistance reading is around 60 ohms. OK - The resistance measurement is approximately 60 ohms.
Proceed to Test Step 4.
NOT OK - The resistance measurement is not approximately 60 ohms.
Repair: Replace the resisters.
Proceed to Test Step 6.
4. Check The Data Link For A Short
A. Turn key start switch and disconnect switch OFF.
B. Disconnect all harnesses from the ECM.
C. At the ECM, measure the resistance between CAN positive contact and a ground point.
D. Measure the resistance between CAN positive contact and all of the other circuits that are used.
The resistance is greater than 4K ohms. OK - The resistance is greater than 4K ohms.
Proceed to Test Step 6.
NOT OK - One or more of the resistance measurements is less than 4K ohms .
Repair: Find the short circuit in the data link circuits in order to resolve this problem.
Proceed to Test Step 6.
Begin Process For FMI 12 Troubleshooting HERE
5. Verify The Hardware And The Software Part Numbers(1)
A. The part number of the flash software for the ECM.
B. The part number of the flash software for the "Monitor Display" ECM.
C. The part number of all components related to the faulty Data Link Circuit.
All part numbers are correct. OK - All part numbers are correct.
Proceed to Test Step 6.
NOT OK -