The Product Link module tracks the machine operating hours for reporting to the office. The Alternator R-Terminal signal is used to detect when the machine is operating. If the input continually receives a voltage signal that is above normal, then machine operation cannot be detected and the reported Service Meter Hours would be inaccurate.
Test Step 1. CHECK THE R-TERMINAL CABLING FOR SHORT TO BATTERY.
- Disconnect the Product Link cable (J1) from the Product Link module.
- Measure the resistance from the Alternator R-terminal input J1-2 (403MC9-GN-18 to battery (J1-1).
Expected Result:
The resistance should be greater than 5000 ohms.
Results:
- OK - The Product Link harness is likely correct. Proceed to Test Step 2.
- NOT OK - The Product Link cable has a probable short to battery.
Repair: Repair the cable and verify the fault has been removed.
Stop.
Test Step 2. CHECK THE PRODUCT LINK HARNESS FOR A SHORT TO A VOLTAGE SOURCE.
- Disconnect the Product Link cable (J1) from the Product Link module.
- Start the engine.
- Measure the Alternator R-Terminal input (J1-4) to verify there is a 11 to 32 V square-wave from 0 to 2 KHz or a steady DC voltage equivalent to the battery present.
Expected Result:
The Alternator R-Terminal input does not measure at a steady DC voltage equivalent to the battery voltage.
Results:
- OK - The signal is an 11 to 32 V square-wave from 0 to 2 KHz or a steady DC voltage equivalent to the battery present. The Product Link harness is likely not faulty. Proceed to Test Step 3.
- NOT OK - The Product Link cable has a possible short to a DC voltage source other than battery voltage.
Repair: Repair the cable and verify the fault has been removed.
Stop.
Test Step 3. CHECK THE MACHINE ALTERNATOR.
- Disconnect the Product Link machine cable from the alternator.
- Start the engine.
- Measure the Alternator R-Terminal to verify there is 11 to 32 V square-wave from 0 to 2 KHz. There should not be a steady DC voltage equivalent to the battery present.
Expected Result:
The alternator R-Terminal should be an 11 to 32 V square-wave from 0 to 2 KHz.
Results:
- OK - The alternator R-Terminal is an 11 to 32 V square-wave from 0 to 2 KHz. Proceed to Test Step 4.
- NOT OK - The alternator R-Terminal is not an 11 to 32 V square-wave from 0 to 2 KHz.
Repair: Repair or replace the Alternator.
Stop.
Test Step 4. CHECK IF THE DIAGNOSTIC CODE IS STILL ACTIVE.
- Clean the contacts of the harness connectors.
- Reconnect all harness connectors.
- Turn the key start switch to the ON position and operate the machine.
- Determine if CID 1251 FMI 03 diagnostic code is present by using the Electronic Technician.
Expected Result:
A CID 1251 FMI 03 diagnostic code is present.
Results:
- YES - The problem has not been corrected. It is unlikely that the ECM is faulty.
Repair: Perform the previous Steps again. If the cause of the diagnostic code is not found, replace the Product Link ECM. See Testing and Adjusting, "Electronic Control Module (ECM) - Replace".
Stop.
- NO - The diagnostic code is NOT present. The problem does not exist at this time. The initial problem was probably caused by a poor electrical connection or a short at one of the harness connectors that was disconnected and reconnected. Resume normal machine operation. Stop.