854G and 854K Wheel Dozers and 992G, 992K and 994F Wheel Loaders VIMSTM MID 049 - CID 0262 - FMI 04 Caterpillar


MID 049 - CID 0262 - FMI 04
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MID 049 CID 0262 FMI 04

Conditions Which Generate This Code:



Illustration 1g01964827
Schematic for 5 volt sensor supply
Sales model 854K/992K

The 5 volt power supply provides power for the pump pressure sensor of the engine fan.

The CID 0262 FMI 04 diagnostic code is recorded when the voltage of the sensor supply circuit is below normal.

The following conditions could cause this diagnostic code:

  • A sensor has failed.

  • The sensor supply circuit is shorted to a ground source.

  • The ECM has failed. This is unlikely.

Test Step 1. CHECK THE SENSOR

  1. Turn the key start switch and the disconnect switch to the OFF position.

  2. Disconnect the pump pressure sensor of the engine fan from the machine harness.

  3. After disconnecting the sensor, check the status of the CID 262 FMI 04 code.

Expected Result:

The CID 262 FMI 04 diagnostic code is no longer active.

Results:

  • OK - The diagnostic code is not active. The harness circuit is correct. The sensor that was just disconnected has failed.

    Repair: Replace the sensor.

    STOP

  • NOT OK - The diagnostic code is still active. The machine harness may be shorted to ground. Proceed to Test Step 2.

Test Step 2. CHECK FOR A SHORT TO GROUND

  1. Turn the key start switch and the disconnect switch to the OFF position.

  2. Disconnect the machine harness connectors J1 and J2 from the ECM.

  3. At the harness connector for the ECM, measure the resistance between frame ground and contact J2-63 (wire R997-OR(Orange)). Measure the resistance between contact J2-63 and all of the other contacts that are used in the J1 and J2 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 harness circuit resistance is correct. Proceed to Test Step 3.

  • NOT OK - The resistance is less than 5000 ohms. The machine harness has failed.

    Repair: The R997-OR(Orange) wire is shorted to ground in the machine harness. Refer to the complete Electrical System Schematic for your machine. Check all harness connectors that are in the power supply circuit. Ensure that the connectors are clean and secure. Repair the machine harness or replace the machine harness.

    STOP

Test Step 3. CHECK THE STATUS OF THE DIAGNOSTIC CODE

  1. Inspect the harness connectors and clean the contacts of the harness connectors. Check the wires for damage to the insulation that is caused by excessive heat, battery acid, or chafing.

  2. Perform a 45 N (10 lb) pull test on each of the wires that are associated with the sensor circuit.

  3. Reconnect all harness connectors. Make sure that the connectors are fully seated. Make sure that the clips for each connector are completely fastened.

  4. Turn the disconnect switch and the key start switch to the ON position.

  5. Operate the machine.

  6. Determine if the CID 0262 FMI 04 diagnostic code is active.

Expected Result:

The CID 0262 FMI 04 diagnostic code is active.

Results:

  • YES - The CID 0262 FMI 04 diagnostic code is active. The problem has not been corrected.

    Repair: Check the circuit again. The AVSpare Electronic Technician (ET) (service tool) may be used in order to perform a “Wiggle Test” on the machine wiring harness. The “Wiggle Test” can detect intermittent shorts or intermittent opens in the machine wiring harness.

    If the cause of the problem is not found, the ECM may be faulty.

    Prior to replacing an ECM, always contact your dealership's Technical Communicator for possible consultation with AVSpare. This consultation may greatly reduce repair time. If the ECM requires replacement, refer to Testing and Adjusting, "Electronic Control Module (ECM) - Replace".

    STOP

  • NO - The CID 0262 FMI 04 diagnostic code is not active. The problem does not exist at this time.

    Repair: The initial diagnostic 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

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