SUPPORT ASSEM. 5V1884 - Caterpillar

Illustration 1 g02079194
Schematic for the Counterbalance Pressure SenderThis diagnostic code is associated with the Counterbalance Pressure Sender. The FMI 04 means that the ECM has determined that the voltage of the circuit for the Counterbalance Pressure Sender is below normal. Note: The Machine ECM is located inside the Center Console.The possible causes of this diagnostic code are listed below:
The signal circuit for the Counterbalance Pressure Sender is shorted to ground.
The Counterbalance Pressure Sender has failed.
The ECM has failed. This is unlikely. Note: The following test procedure may create other diagnostic codes. Ignore these created diagnostic codes and clear the diagnostic codes when the original diagnostic code has been corrected. Ensure that the diagnostic code of CID 2823 FMI 04 is active before performing this procedure. System Response:When this diagnostic code is active, the following occurs:
Counterbalance pressure display on a Tamper Bar screed will be disabled.
Counterbalance pressure display on a Vibratory screed will be disabled within the Advisor display.
Operator station fault lamp is active.Test Step 1. CHECK THE COUNTERBALANCE PRESSURE SENDER
Turn the disconnect switch and the key start switch to the ON position.
Ensure that the diagnostic code is active.
Observe the status of the diagnostic code. Disconnect the Counterbalance Pressure Sender from the machine harness.Expected Result:The CID 2823 FMI 04 remains active. The FMI has not changed and the "04" is still active.Results:
OK - The diagnostic code remains active. The Counterbalance Pressure Sender is correct. Proceed to Test Step 2.
NOT OK - The diagnostic code is no longer active. The Counterbalance Pressure Sender has failed.Repair: Replace the Counterbalance Pressure Sender.STOPTest Step 2. CHECK THE WIRING HARNESS OF THE COUNTERBALANCE PRESSURE SENDER FOR A SHORT TO GROUND.
Turn the key start switch and the disconnect switch to the OFF position.
Disconnect the machine harness from the Counterbalance Pressure Sender.
Disconnect the machine harness connector from the ECM.
At the machine harness connector for the ECM, measure the resistance from the signal contact J1-36 (wire 828-WH) of the machine harness to all possible sources of ground. Measure the resistance to all contacts of the machine harness connectors for the ECM.Expected Result:Each resistance measurement is greater than 5000 ohms.Results:
OK - Each resistance measurement is greater than 5000 ohms. The machine harness is correct. Proceed to Test Step 3.
NOT OK - One or more resistance measurements is not correct. There is a short in the machine harness. Repair: The short is between signal contact J1-36 (wire 828-WH) and the circuit with the low resistance measurement. Repair the machine harness or replace the machine harness.STOPTest Step 3. CHECK THE COUNTERBALANCE PRESSURE SENDER SIGNAL
Reconnect the all the harness connectors.
At the back of the harness connector for the Counterbalance Pressure Sender, insert a 7X-1710 Multimeter Probe along the ground wire (contact B).
At the back of the harness connector for the Counterbalance Pressure Sender, insert a 7X-1710 Multimeter Probe along the signal lead (contact C).
Turn the disconnect switch and the engine start switch to the ON position, but do NOT start the engine.
Measure the voltage of the Counterbalance Pressure Sender Signal.Expected Result:The