VALVE GP-TRAVEL COUNTERBALANCE 2042819 - Caterpillar

Illustration 5 g01118589
Small terminals for the typical air inlet heater relay
Disconnect the wires from the small terminals of the air inlet heater relay.
Install a test lamp across the wires.
Restore the electrical power to the ECM.
Start the "Air Inlet Heater Override" on Cat ET and observe the test lamp. Note: Do not leave the "Air Inlet Heater Override" on for an extended period of time. This will prevent unnecessary cycling of the air inlet heater and the battery from discharging. The "Air Inlet Heater Override" has a one minute timer that disables the test when the time expires.
Stop the "Air Inlet Heater Override".
Remove the electrical power from the ECM. Expected Result:The test lamp illuminates while the override is active.Results:
OK - The test lamp illuminates while the override is active. There is a problem in the control circuit of the relay.Repair: Replace the air inlet heater relay. Clear any diagnostic codes. Verify that the problem is resolved.STOP
Not OK - The test lamp did not turn on while the override was active. There is a problem in the harness or in a connector from the ECM to the air inlet heater relay. There may be a problem with the ECM. Return the wiring to the original configuration. Proceed to Test Step 4.Test Step 4. Check for Proper Operation of the ECM
Remove the electrical power from the ECM.
Disconnect the J2/P2 ECM connectors.
Fabricate two jumper wires that are long enough to create a test circuit at the ECM connector. Crimp connector sockets to one end of each of the jumper wires.
Remove the wires from terminal locations P2-5 and P2-79. Install a jumper wire into each of these terminal locations.
Connect the J2/P2 ECM connectors.
Fasten the leads of the test lamp onto the ends of the jumper wires.
Restore the electrical power to the ECM.
Start the "Air Inlet Heater Override" on Cat ET and observe the test lamp. Note: Do not leave the "Air Inlet Heater Override" on for an extended period of time. This will prevent unnecessary cycling of the air inlet heater and the battery from discharging. The "Air Inlet Heater Override" has a one minute timer that disables the test when the time expires.
Return the wiring to the original configuration.
Remove the electrical power from the ECM. Expected Result:The test lamp illuminates while the override is active.Results:
OK - The test lamp illuminates while the override is active.Repair: The ECM is operating correctly. The problem is in the harness or in a connector between the ECM and the air inlet heater relay. Check the resistance of the wiring in the harness in order to isolate the problem. Repair the harness and/or the connectors. Replace parts, if necessary. Verify that the repair eliminates the original problem.STOP
Not OK - The test lamp did not illuminate while the override was active.Repair: There is a problem with the ECM. Perform the following procedure:
Temporarily connect a test ECM. Refer to Troubleshooting, "ECM - Replace".
Recheck the circuit in order to ensure that the original problem has been resolved. If the problem is