14L Motor Grader Implement Electronic Control System Caterpillar

Illustration 1	g01267511
Implement ECM 10VDC Power Supply connections

This diagnostic code is associated with the Implement ECM 10V sensor power supply. The 10V sensor power supply provides power for the right-hand joystick and the auxiliary attachment control components.

Note: The Implement ECM 10V sensor power supply is one of two power supplies that are used for the right-hand joystick. The other power source for the right-hand joystick is supplied by the Transmission Chassis ECM.

The CID 1482 FMI 03 diagnostic code is activated when the Implement ECM detects that the voltage of the 10V power supply circuit is above normal.

The following conditions could cause this diagnostic code:

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

• The ECM has failed. This is unlikely.

Note: 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, secure and 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.

Test Step 1. CHECK THE VOLTAGE AT THE COMPONENT

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

2. At the right-hand joystick connector J1, insert a 7X-1710 Multimeter Probe along the supply wire 709-OR(Orange) at contact J1-1. Insert a 7X-1710 Multimeter Probe along the return wire A295-BK(Black) at contact J1-3.

3. Measure the voltage between the supply contact J1-1 and the return contact J1-3.

Expected Result:

The voltage measurement is 10.0 ± 0.4 VDC.

Results:

• OK. - The voltage measurement is 10.0 ± 0.4 VDC. The voltage is correct. Proceed to Test Step 4.

• NOT OK. - The voltage measurement is greater than 10.0 ± 0.4 VDC. The voltage 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 switch to the OFF position.

2. At the Implement ECM connector J1, use a 151-6320 Removal Tool or a similar tool to remove the power supply wire and socket at contact J1-69 (wire 709-OR(Orange)) from the connector. The machine harness connector J1 remains connected to the ECM.

3. At the Implement ECM connector J1, insert a 7X-1710 Multimeter Probe along the return wire A295-BK(Black) and socket at contact J1-70.

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

5. Use a multimeter probe in order to make contact on the ECM connector pin at contact J1-69. Measure the voltage at the ECM between the power supply contact J1-69 and the return contact J1-70.

Expected Result:

The voltage measurement is 10.0 ± 0.4 VDC.

Results:

• OK. - The voltage measurement is 10.0 ± 0.4 VDC. The voltage is correct. The ECM power supply is correct. Install the wire and socket that were removed from the J1 connector back into their original locations. Proceed to Test Step 3.

• NOT OK. - The voltage measurement is greater than 10.0 ± 0.4 VDC. The ECM power supply is not correct.

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

  STOP

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

The machine harness connector J1 remains disconnected from the right joystick.

1. Disconnect the machine harness connectors from any other components that are receiving power from the 10V power supply.

2. Turn the disconnect switch and the key switch to the OFF position.

3. Disconnect the machine harness connectors J1 and J2 from the Implement ECM.

4. At the ECM harness connector J1, measure the resistance from contact J1-69 (wire 709-OR(Orange)) to all of the other contacts that are used in connectors J1 and J2 for the Implement ECM.

Expected Result:

Each resistance measurement is greater than 5kΩ.

Results:

• OK. - Each resistance measurement is greater than 5kΩ. 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 5kΩ. There is a short in the machine harness.

  Repair: The power supply circuit is shorted to another circuit in the machine harness. Refer to the complete machine Electrical System Schematic. Examine the supply circuit in order to determine where the problem could be.

  For information on testing for short circuits and finding short circuits, refer to Testing and Adjusting, "Wiring Harness (Short Circuit) - Test". Repair the machine harness or replace machine harness.

  STOP

Test Step 4. 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 and 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 1482 FMI 03 diagnostic code is active.

Expected Result:

The CID 1482 FMI 03 diagnostic code is active.

Results:

• YES. - The CID 1482 FMI 03 diagnostic code is active. The problem has not been corrected.

  Repair: Check the circuit again. Use the Caterpillar Electronic Technician (ET) service tool, if available, in order to perform a "Wiggle Test" on the machine wiring harness. The wiggle test can detect momentary or intermittent shorts or opens in the machine wiring harness.

  If the cause of the problem is not found, the ECM may be activating the diagnostic code incorrectly. The ECM may have failed.

  Prior to replacing an ECM, always contact your dealership's Technical Communicator for possible consultation with Caterpillar. 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 1482 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