BARREL 1556654 - Caterpillar

Illustration 1 g02115493
"Continuous Flow Switch"schematic diagramThis diagnostic code is associated with the "Loader Auxiliary Continuous Flow" Switch. This switch has two inputs to the ECM: a normally open circuit (wire 852-GN) and a normally grounded circuit (wire P993-OR). During normal operation, one switch input is open and the other input is grounded. If each input is in the same state, the ECM will detect a diagnostic code. This diagnostic code is detected when both switch inputs are grounded at the same time.The possible causes of this diagnostic code are listed below:
Short to the ground circuit.
The circuit is shorted.
A failed switch
The ECM may have failed. This is unlikely.Note: The following test procedure may create other diagnostic codes. Ignore these created diagnostic codes and clear these diagnostic codes when the original diagnostic code has been corrected. Ensure that the diagnostic code of CID 2735 FMI 04 is active before performing this procedure.Note: Use the 146-4080 Digital Multimeter for the measurements in this procedure.System Response:A level 2 warning is generated. All implement functions will be unavailable. The pilot pressure solenoid will be disabled until the diagnostic code has been cleared and all joysticks have been placed in the neutral position.Test Step 1. CHECK THE CIRCUIT FOR THE SWITCH.
Turn the disconnect switch and the key start switch to the OFF position.
Disconnect the J1 and J2 machine harness connectors from the ECM.
At the J1 and J2 machine harness connectors, measure the resistance from contact J1-40 (wire 852-GN) to contact J2-37 (wire P993-OR) with the switch in the Enabled position and the Disable positions.Expected Result:The resistance should measure less than 5 ohms for the enabled position and more than 5000 ohms for the disabled position of the switch.Results:
YES - The resistance is correct for each measurement. Proceed to test step 3.
NO - The resistance measurement is greater than 5000 ohms for both measurements. The harness or the switch has failed. Proceed to test step 2.Test Step 2. CHECK FOR A SHORT.
Disconnect the switch from the harness.
At the J1 and J2 machine harness connectors, measure the resistance from contact J1-40 and contact J2-37 to all other J1 and J2 contacts.Expected Result:The resistance measurement should be greater than 5000 ohms for each measurement.Results:
OK - The resistance measurement is greater than 5000 ohms for each measurement.Repair: Replace the switch. Proceed to Test Step 3.
NOT OK - The resistance measurement is not greater than 5000 ohms for one or more measurements.Repair: The short is in the circuit with the low resistance measurement. Repair the harness or replace the harness. Verify that the problem has been corrected.STOPTest Step 3. CHECK IF THE DIAGNOSTIC CODE REMAINS
Inspect the contacts of the harness connectors. Clean the harness connectors.
Reconnect all the harness connectors.
Turn the disconnect switch and the key start switch to the ON position.
Operate the machine.
Check the status of the CID 2735 FMI 04 diagnostic code. Expected Result:The CID 2735 FMI 04 diagnostic code is active. Results:
YES - The CID 2735 FMI 04 diagnostic code is active. The diagnostic code has not been