CAGE 7S8615 - Caterpillar

Illustration 1 g01206575
Schematic of the Solenoid Valves (Ride Control)This diagnostic code is associated with the Ride Control Solenoid Valve #1. The FMI 03 means that the ECM has determined that the voltage of the circuit for Ride Control Solenoid Valve #1 is above normal.The possible causes of the diagnostic code are listed:
Ride Control Solenoid Valve #1 has failed.
The energize circuit of Ride Control Solenoid Valve #1 is shorted to the +battery circuit.
The ECM has 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 2129 FMI 03 is active before performing this procedure.Note: Use the 146-4080 Digital Multimeter for the measurements in this procedure.System Response:When this diagnostic code occurs, the ride control function will stick in a balance position. The other two ride control solenoids are not energized. The operator does not have ride control that is independent of the switch setting.Test Step 1. CHECK THE SOLENOID.
Turn the disconnect switch and the key start switch to the ON position. Do not start the engine.
Disconnect the Ride Control Solenoid Valve #1 from the machine harness.
At the machine harness connector for the solenoid, place a jumper wire from contact 2 to contact 1.
Observe the status of the CID 2129 FMI 03.Expected Result:The CID 2129 FMI 03 remains active. The FMI has not changed and the "03" is still active.Results:
YES - The diagnostic code remains active. The jumper wire does not affect the diagnostic code. Proceed to Test Step 2.
NO - The diagnostic is no longer active. The solenoid has failed.Repair: The solenoid has failed. Repeat this Test Step "CHECK THE SOLENOID" in order to verify the solenoid failure. Replace the solenoid. Verify that the new solenoid corrects the problem.STOPTest Step 2. CHECK THE ENERGIZE CIRCUIT OF THE SOLENOID FOR A SHORT TO THE +BATTERY CIRCUIT.
Turn the key start switch and the disconnect switch to the OFF position.
The Ride Control Solenoid Valve #1 remains disconnected from the machine harness.
Disconnect the machine harness connector(s) from the ECM.
At the machine harness connector for the ECM, measure the resistance from contact J2-5 (wire 976-OR) to all contacts that are used in 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 - Each resistance measurement is not greater than 5000 ohms. There is a short in the machine harness. The short is between J2-5 and the circuit that has a low resistance measurement.Repair: Repair the machine harness or replace the machine harness.STOPTest Step 3. CHECK IF THE DIAGNOSTIC CODE IS STILL ACTIVE.
Inspect the contacts and clean the contacts of the harness connectors.
Reconnect all harness connectors.
Turn the disconnect switch and the key start switch to the ON position.
Operate the machine.
Determine if the CID 2129 FMI 03 is active.Expected Result:The CID 2129 FMI 03