854G and 854K Wheel Dozers and 992G, 992K and 994F Wheel Loaders VIMSTM MID 049 - CID 0262 - FMI 03 Caterpillar


MID 049 - CID 0262 - FMI 03
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MID 049 CID 0262 FMI 03

Conditions Which Generate This Code:



Illustration 1g01964827
Schematic of the 5 Volt sensor supply
Sales model 854K/992K

This diagnostic code is associated with the 5 volt sensor power supply of the VIMS ECM. The 5 volt sensor power supply provides power for the pump pressure sensor of the engine fan.

The CID 0262 FMI 03 diagnostic code is activated when the ECM detects higher than normal voltage of the 5 volt power supply circuit.

The following causes could signal this diagnostic code:

  • The power supply circuit is shorted to a higher voltage source.

  • The ECM has failed. This is unlikely.

Before performing this procedure, inspect the harness connectors that are involved in the circuit. Poor connections can often be the cause of a problem in an electrical circuit. Verify that all connections in the circuit are clean and secure. Verify that all connections are in good condition. If a problem with a connection is found, correct the problem and verify that this diagnostic code is active before performing this procedure.

Note: The following test procedure may create other diagnostic codes. Ignore these created diagnostic codes and clear the diagnostic codes when the problem has been corrected. Verify that the CID 0262 FMI 03 is active before performing this procedure.

System Response:

A warning level 1 will be generated. Any sensor that uses this supply is disabled.

Test Step 1. CHECK THE VOLTAGE AT THE SENSORS

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

  2. Disconnect the machine harness connector from the pressure sensor.

  3. Measure the voltage from contact A (wire R997-OR(Orange)) to return contact B (wire J843-BK(Black)) at the machine harness connector for the pressure sensor.

Expected Result:

The voltage measurement is 5.0 ± 0.4 DCV.

Results:

  • OK - The voltage measurement is 5.0 ± 0.4 DCV. The voltage is correct. Proceed to Test Step 4.

  • NOT OK - The voltage measurement is greater than 5.0 ± 0.4 DCV. The measurement is not correct. Proceed to Test Step 2.

Test Step 2. CHECK THE POWER SUPPLY AT THE ECM

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

  2. Use a 151-6320 Removal Tool or a similar tool to remove the wire at contact J2-63 (wire R997-OR(Orange)) and the wire at contact J2-53 (wire J843-BK(Black)) from the connector. The machine harness connector J2 remains connected to the ECM.

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

  4. Use the multimeter probes in order to make contact on the pins in the ECM connector. Measure the voltage at the ECM pins between contact J2-63 and contact J2-53.

Expected Result:

The voltage measurement is 5.0 ± 0.4 DCV.

Results:

  • OK - The voltage measurement is 5.0 ± 0.4 DCV. The voltage is correct. The ECM power supply is correct. Turn the key start switch and the disconnect switch to the OFF position. Install the wires and sockets that were removed from the J2 connector back into the original locations. Proceed to Test Step 3.

  • NOT OK - The voltage measurement is greater than 5.0 ± 0.4 DCV. The ECM power supply is not correct.

    Repair: 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 Troubleshooting, "Electronic Control Module (ECM) - Replace".

    STOP

Test Step 3. CHECK FOR A SHORT CIRCUIT IN THE MACHINE HARNESS

The machine harness connector remains disconnected from the sensor.

  1. The disconnect switch and the key start switch remain in the OFF position.

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

  3. At the harness connector J2, measure the resistance from contact J2-63 (wire R997-OR(Orange)) to all of the other contacts that are used in connectors J1 and J2 for the ECM.

Expected Result:

Each resistance measurement is greater than 5000 ohms.

Results:

  • OK - Each resistance measurement is greater than 5000 ohms. The supply circuit is not shorted to another circuit in the machine harness. Proceed to Test Step 4.

  • NOT OK - One or more of the resistance measurements is less than 5000 ohms. There is a short in the machine harness between the power supply circuit and the circuit with the low resistance.

    Repair: Refer to the complete Electrical System Schematic of the machine. Examine all of the connectors of the machine harness for possible short circuits. For information on testing for short circuits and finding short circuits, refer to Troubleshooting, "Wiring Harness (Short Circuit) - Test". Repair the machine harness or replace the machine harness.

    STOP

Test Step 4. CHECK THE STATUS OF THE DIAGNOSTIC CODE

  1. Inspect the harness connectors. Clean the contacts of the harness connectors. Check the wires for damage to the insulation. Damage may be caused by excessive heat, corrosion, 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 03 diagnostic code is active.

Expected Result:

The CID 0262 FMI 03 diagnostic code is active.

Results:

  • YES - The CID 0262 FMI 03 diagnostic code is active. The problem has not been corrected.

    Repair: Check the circuit again.

    If the cause of the problem is not found, contact the Technical Communicator for your dealership for possible consultation with AVSpare. This consultation may greatly reduce repair time. If the ECM requires replacement, see Troubleshooting, "Electronic Control Module (ECM) - Replace".

    STOP

  • NO - The CID 0262 FMI 03 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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