GEAR-SUN 2065794 - Caterpillar

Probable Causes
Wiring and/or electrical connectors
Cat Data Link
CAN data link (if equipped)
Electronic Control Module (ECM)Recommended Actions
Note: The procedures have been listed in order of probability. Complete the procedures in the order of the listed test steps.
Table 1
Troubleshooting Test Steps Values Results
1. Check for correct installation of the connectors for the ECM J1/P1, J2/P2, and J3/P3.
Refer to the diagnostic functional test Troubleshooting, "Electrical Connectors - Inspect"
ECM
Result: Connectors are installed incorrectly.
Repair: Correct the installation issue. Return to service.
Result: Connectors are installed correctly. Proceed to Test Step 2
2. Connect Cat ® Electronic Technician (Cat ET) to the service tool connector.
Cat ET
Result: Cat ET will not communicate with the ECM.
Proceed to troubleshooting without a diagnostic code Troubleshooting, "Electronic Service Tool Will Not Communicate with ECM."
Result: Cat ET communicates with the ECM. Proceed to Test Step 3.
3. Troubleshoot the Cat Data Link for possible problems.
Cat Data Link
Result: Cat Data Link does not connect. Refer to the diagnostic functional test Troubleshooting, "Cat Data Link Circuit - Test".
Result: Cat Data Link connects. Proceed to Test Step 4.
4. Troubleshoot the CAN Data Link (if equipped) for possible problems.
CAN Data Link
Result: CAN Data Link does not connect. Refer to the diagnostic functional test Troubleshooting, "CAN Data Link Circuit - Test".
Result: CAN Data Link connects. Return to service.