Illustration 1 | g01298884 |
Schematic of the solenoid valve |
This diagnostic trouble code is associated with the solenoid valve. The FMI 06 means that the ECU has determined that there is a short to ground in the solenoid circuit.
The possible causes of this diagnostic trouble code are listed:
- The energize circuit of the solenoid is shorted to ground.
- The solenoid has failed.
- The ECU has failed. This is unlikely.
Note: The following test procedure may create other diagnostic trouble codes. Ignore these created diagnostic trouble codes and clear the diagnostic trouble codes when the original diagnostic trouble code has been corrected. Ensure that the diagnostic trouble code of CID 2859 FMI 06 is active before performing this procedure.
Note: Use a digital multimeter for the measurements in this procedure.
Test Step 1. CHECK THE SOLENOID.
- Turn the disconnect switch and the key start switch to the ON position. Do not start the engine.
- Observe the status of the diagnostic trouble code.
- Disconnect the solenoid with the active diagnostic trouble code from the machine harness.
Expected Result:
CID 2859 FMI 06 changes to CID 2859 FMI 05 when the solenoid is disconnected.
Results:
- YES - CID 2859 FMI 06 changes to CID 2859 FMI 05 when the solenoid is disconnected. The circuit is correct.
Repair: The solenoid has failed. Replace the solenoid. Verify that the new solenoid corrects the problem.
STOP
- NO - CID 2859 FMI 06 remains active. Proceed to Test Step 2.
Test Step 2. CHECK THE ENERGIZE CIRCUIT OF THE SOLENOID FOR A SHORT TO GROUND.
- Turn the key start switch and the disconnect switch to the OFF position.
- The solenoid remains disconnected from the machine harness.
- Disconnect the machine harness connector(s) from the ECU.
- At the machine harness connector, measure the resistance from the signal contact J1-65 (wire X956-OR) to all contacts that are used in the machine harness connectors for the ECU.
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 J1-65 (wire X956-OR) and the circuit with the low resistance measurement.
Repair: Repair the machine harness or replace the machine harness.
STOP
Test Step 3. CHECK IF THE DIAGNOSTIC TROUBLE CODE REMAINS.
- Inspect the harness connectors. Clean the contacts of the harness connectors and check the wires for damage to the insulation that is caused by excessive heat, battery acid, or chafing.
- Perform a 45 N (10 lb) pull test on each of the wires that are associated with the circuit.
- Reconnect all of the harness connectors. Make sure that the connectors are fully seated and that the clips for each connector are completely fastened.
- Turn the disconnect switch and the key start switch to the ON position.
- Operate the machine.
- Check the status of the CID 2859 FMI 06.
Expected Result:
The CID 2859 FMI 06 is active.
Results:
- YES - The CID 2859 FMI 06 is active. The diagnostic trouble code has not been corrected.
Repair: Check the circuit again. If the Caterpillar Electronic Technician (ET) is available, use the Cat ET service tool in order to perform a "Wiggle Test" on the machine wiring harness. The "Wiggle Test" can detect shorts and opens in the machine wiring harness that are momentary or intermittent.It is unlikely that the ECU has failed. Exit this procedure and perform this procedure again. If the cause of the diagnostic trouble code is not found, replace the ECU. See Testing and Adjusting, "Electronic Control Unit - Replace".
STOP
- NO - The CID 2859 FMI 06 is not active. The diagnostic trouble code does not exist at this time.
Repair: The initial diagnostic trouble code was probably caused by a poor electrical connection or a short at one of the harness connectors that was disconnected and reconnected. Resume normal machine operation.
STOP