416E, 420E and 430E Backhoe Loaders MID 039 - CID 0590 - FMI 09 Caterpillar

Conditions Which Generate This Code:

Illustration 1	g01442621
Schematic for the Cat Data Link

This diagnostic code is recorded when the Machine ECM is unable to communicate with the Engine ECM.

The possible causes of this diagnostic code are listed below:

• The data link wire between the Machine ECM and the Engine ECM has failed.

• An open connection exists in the 30 amp fuse for the Engine ECM.

• An open connection has occurred along wire 308-YL.

System Response:

The machine response is listed:

• Calibrations of the implement control valve will not work due to unavailable engine speed input.

• The "Pilot On/Off" solenoid valve will shut off when all the levers are in the HOLD position.

Note: Ensure that the diagnostic code is active.

Test Step 1. CHECK THE CONTINUITY OF THE FUSE FOR THE MACHINE ECM

1. The disconnect switch remains in the OFF position.

2. Remove the 30 amp fuse for the Machine ECM from the fuse panel. The fuse is located under the "loader" joystick. Locate the plastic panel that is secured by two Torx screws under the "loader" joystick.

3. Place the leads of a digital multimeter across the contacts of the fuse. Set the meter to read ohms and note the measurement.

Expected Result:

The resistance of the fuse is less than 5 ohms.

Results:

• OK - The resistance of the fuse is less than 5 ohms. The fuse is correct. Proceed to Test Step 2.

• NOT OK - The resistance of the fuse is more than 5 ohms.

  Repair: Replace the fuse. Ensure that the fix has corrected the problem.

  STOP

Test Step 2. CHECK THE COMPATIBILITY OF THE SOFTWARE.

1. For the correct software part numbers, refer to the Electronics Groups in the parts manual for the machine that is being serviced.

Expected Result:

The software is compatible.

Results:

• YES - The software is compatible. Proceed to Test Step 3.

• NO - The software is not compatible.

  Repair: Flash the proper software to the appropriate ECM. Cycle the key start switch in order to initialize the new software. Ensure that the diagnostic code is no longer active.

  If this does not resolve the problem, proceed to Test Step 3.

Test Step 3. CHECK THE +BATTERY CIRCUIT AT THE CONNECTORS OF THE MACHINE ECM .

1. Turn the disconnect switch to the OFF position.

2. Turn the key start switch to the OFF position.

3. Disconnect connector J1 from the Machine ECM.

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

5. At the connector J1, measure the voltage between all possible sources of positive voltage to all possible sources of ground.

Expected Result:

The voltage measures 18 DCV to 35 DCV.

Results:

• YES - The voltage measures 18 DCV to 35 DCV. The voltage is correct. Proceed to Test Step 4.

• NO - The voltage measures less than 18 DCV.

  Repair: Ensure that a proper ground exists. Also, check the circuit breakers. If the ground is proper, the power circuit has failed. Repair the power circuit or replace the power circuit.

  If this does not resolve the problem, proceed to Test Step 5.

Test Step 4. CHECK FOR A DATA LINK CIRCUIT SHORT TO GROUND.

1. Turn the disconnect switch to the OFF position.

2. Turn the key start switch to the OFF position.

3. Inspect the harness connectors that are related to the Cat Data Link circuits. Ensure that the connector contacts are clean and that the connectors are tight. If necessary, repair the connectors or replace the connectors.

4. Disconnect the harness from all modules.

5. Measure the resistance between the Cat Data Link connectors and all possible sources of ground. The Cat Data Link connectors are J1-10 and J1-20.

Expected Result:

The resistance is greater than 5000 Ohms for each measurement.

Results:

• YES - The measured resistance is greater than 5000 Ohms for each measurement. The machine is correct. Proceed to Test Step 5.

• NO - The resistance is less than 5000 Ohms for each measurement.

  Repair: The short is between the circuit with the resistance that is less than 5000 Ohms and contact J1-10 (wire 893-GN) and contact J1-20 (wire 892-BR). Repair the harness or replace the harness.

  STOP

Test Step 5. CHECK FOR A DATA LINK CIRCUIT SHORT TO POSITIVE VOLTAGE.

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

2. All the modules remain disconnected from the harness.

3. Measure the resistance between the data link and all possible sources of positive voltage at the harness connector for the ECM. The data link connectors are J1-10 and J1-20.

Expected Result:

The resistance is more than 5000 Ohms.

Results:

• YES - The resistance is more than 5000 Ohms. The harness is correct. Proceed to Test Step 6.

• NO - The resistance is less than 5000 Ohms. There is a short in the harness. The short is between the circuit with the resistance that is less than 5000 Ohms and connector contact J1-10 (wire 893-GN) or connector contact J1-20 (892-BR).

  Repair: Repair the harness or replace the harness.

  Ensure that the diagnostic code is inactive now. If the diagnostic code is still active, proceed to Test Step 6.

Test Step 6. CHECK THE DATA LINK FOR AN OPEN CIRCUIT.

1. The disconnect switch remains OFF.

2. All of the electronic control modules remain disconnected from the machine harness.

3. At the Machine ECM, measure the resistance between connector J1-10 (wire 893-GN) and connector J1-23 (wire 893-GN) for the Engine ECM .

4. At the Machine ECM, measure the resistance to connector J1-20 (wire 892-BR) to the corresponding connector J1-24 (wire 892-BR) for the Engine ECM.

Expected Result:

There is less than 5 Ohms of resistance for each measurement.

Results:

• YES - There is less than 5 Ohms of resistance for each measurement. The circuit in the harness is correct.

  Repair: It is unlikely that the ECM has failed. Exit this procedure and perform this step again.

  If the cause of the diagnostic code is not found, proceed to Test Step 7.

• NO - The resistance for each measurement is greater than 5 Ohms. The Cat Data Link circuit connector (wire 893-GN or wire 892-BR) is open in the harness.

  Repair: Repair the harness or replace the harness. Ensure that the diagnostic code is no longer active.

  STOP

Test Step 7. CHECK THE ENERGIZEWIRE FOR AN OPEN CIRCUIT

1. The disconnect switch remains in the OFF position.

2. All of the electronic control modules remain disconnected from the machine harness.

3. At the Machine ECM, measure the resistance between connector J1-1 (wire 308-YL) and connector J1-1 (wire 893-GN) for the "Autoshift Shifter" Module.

Expected Result:

There is less than 5 Ohms of resistance for the measurement.

Results:

• YES - There is less than 5 Ohms of resistance for each measurement. The circuit in the harness is correct.STOP

• NO - The resistance for each measurement is greater than 5 Ohms. The Cat Data Link harness connector (wire 308-YL has an open circuit.

  Repair: Repair the harness or replace the harness. Ensure that the diagnostic code is no longer active.

  If the diagnostic code is active, proceed to Test Step 8.

Test Step 8. RECHECK FOR DIAGNOSTIC CODES.

1. Ensure that the diagnostic code is inactive.

Expected Result:

The diagnostic code is inactive.

Results:

• YES - The diagnostic code is inactive.

  Repair: The diagnostic code is no longer active.

  STOP

• NO - The diagnostic code is active. The ECM may have failed.

  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 must be replaced, refer to Testing and Adjusting, "Electronic Control Module (ECM) - Replace".

  STOP