EDGE-CUTTING 8J8223 - Caterpillar

Illustration 1 g03608876
Part of the Schematic of the Cat® Data Link
This diagnostic code is recorded when the Power Train Electronic Control Module (ECM) cannot communicate with the Caterpillar Monitoring System via the Cat® Data Link. The update rate from the ECM is not correct.The Cat Data Link is an input and an output of all modules. The Cat Data Link is designed to enable communications for all electronic control modules and service tools. The Cat Data Link is not a visible component. The data link consists of internal control circuits and the connecting harness wiring.Test Step 1. CHECK THE COMPATIBILITY OF THE SOFTWARE
Verify that the software is compatible. For the correct software part numbers, refer to the Electronics Groups in the parts manual for the machine that is being serviced. Expected Result:The software is compatible.Results:
YES - The software is compatible. Proceed to Test Step 2.
NO - The software is not compatible.Repair: Install the correct software. Ensure that the correct part number was used if any electronic control modules have been replaced. Continue if the conditions are not resolved.STOPTest Step 2. CHECK THE +BATTERY CIRCUIT OF THE POWER TRAIN ECM
Turn the key start switch and the disconnect switch to the OFF position.
Disconnect connector J1 from the Power Train ECM.
Turn the disconnect switch and the key start switch to the ON position.
At connector J1, measure the voltage from +battery terminals to the negative battery terminals. Expected Result:The voltage should measure 18 to 35 V.Results:
YES - The voltage is correct. The Power Train ECM is receiving the voltage. Proceed to Test Step 3.
NO - The voltage does not measure 18 to 35 V.Repair: The Power Train ECM is not receiving the correct voltage. Ensure that proper ground is available. If the ground is correct, repair the power circuit. Also, check the circuit breakers.If conditions are not resolved, proceed to Test Step 4.Test Step 3. CHECK THE +BATTERY CIRCUIT OF THE MACHINE ECM
Turn the key start switch and the disconnect switch to the OFF position.
Disconnect connector J1 from the Machine ECM.
Turn the disconnect switch and the key start switch to the ON position.
At connector J1, measure the voltage from +battery terminals to the negative battery terminals. Expected Result:The voltage should measure 18 to 35 V.Results:
YES - The voltage is correct. The Machine ECM is receiving the voltage. Proceed to Test Step 4.
NO - The voltage does not measure 18 to 35 V.Repair: The Machine ECM is not receiving the correct voltage. Ensure that proper ground is available. If the ground is correct, repair the power circuit. Also, check the circuit breakers.If conditions are not resolved, proceed to Test Step 4.Test Step 4. CHECK THE CAT DATA LINK CIRCUIT FOR A SHORT TO GROUND
Turn the key start switch and the disconnect switch to the OFF position.
Inspect the machine harness connectors that are related to the circuits of the Cat Data Link. Ensure that the connector contacts are clean and tight.
Disconnect the machine harness from all modules.
At the machine harness connector for the ECM, measure