GAUGE GP 5Y1274 - Caterpillar

Which Generate This Code:Communication with the satellite will not occur when power to the Product Link is below 10.5 DCV. The Product Link will still communicate with the Electronic Technician when power to the module is down to 9 DCV. A diagnostic code of CID 168 FMI 01 will occur when the system voltage drops below 11 VDC. A diagnostic code of CID 254 FMI 04 will occur when the system voltage drops below 9 DCV. This CID is logged so that no messages will be communicated from the machine to the office. Test Step 1. CHECK THE SYSTEM VOLTAGE AT THE PRODUCT LINK.
Start the engine and operate the engine at a high idle.
Measure the system voltage between the +battery and -battery contacts.Expected Result:The voltage is 11 DCV to 32 DCV.Results:
OK - The voltage is 11 DCV to 32 DCV. The Product Link should not be logging this diagnostic code. Repair: Use the ET to clear the diagnostic code from the Product Link. If the voltage is correct and the Product Link records the diagnostic code again, the Product Link may need to be replaced. Before replacing the Product Link, contact the Service System Support Center. Stop.
NOT OK - The voltage is not 11 DCV to 32 DCV. Proceed to Test Step 2Test Step 2. CHECK THE ALTERNATOR.
Run the engine at high idle for several minutes.
Measure the voltage output at the battery posts.Expected Result:The voltage should be below 32 DCV.Results:
OK - The voltage is below 32 DCV.The battery could be faulty. Proceed to Test Step 3.
NOT OK - The voltage is above 32 DCV. Repair or replace alternator. The voltage regulator could be faulty. If conditions are not resolved, proceed to Test Step 3.Test Step 3. CHECK THE BATTERY VOLTAGE.Turn the key start switch to the OFF position. Measure the battery voltage at the battery posts.Expected Result:The voltage should be below 32 DCV.Results:
OK - The voltage is below 32 DCV. Proceed to Test Step 4
NOT OK - The voltage is above 32 DCV. Repair: See Special Instruction, REHS0354, "Charging System Troubleshooting". If conditions are not resolved, proceed to Test Step 4.Test Step 4. CHECK OTHER ECMS ON THE MACHINE.Check the logged diagnostics of any other ECMs installed on the machine in order to see if they have logged CID 168 FMI 00 in the same time period. Note that the Diagnostic Clock Hours (DCH) on the logs may be different, the difference between the current DCH and the logged DCH is what is important.Expected Result:There are no other CID 168 FMI 00 diagnostic codes found on other ECMs.Results:
YES - There are no CID 168 FMI 00 diagnostic codes found on other ECMs.Repair: If no problem is found with the charging system or wiring and the fault has occurred only a few times, clear the fault and monitor the module and machine for further occurrences. If the fault occurs repeatedly, then the Product Link module is possibly defective and should be replaced. Refer to Testing and Adjusting, "Electronic Control