D6N Track-Type Tractor Caterpillar

Illustration 1	g01758433
Blade Tilt (X-axis Left/Right) position sensor schematic

A CID 1079 diagnostic code is associated with the Blade Tilt (X-axis Left/Right) position sensor for the Blade tilt left and right commands. An FMI 08 indicates the machine ECM has determined that the signal data received from the sensor has an abnormal frequency, pulse width, or period.

Possible causes for this diagnostic code are:

• A related, active diagnostic code.

• Poor electrical connections in the machine harness.

• Sensor circuit shorted to ground.

• Sensor circuit shorted to +Battery.

• Sensor circuit is open.

• Failed machine ECM. This condition is unlikely.

Note: Poor connections often cause problems in electrical circuits. Before performing this procedure, inspect all of the harness connectors involved in the circuit. Verify that all circuit connections are clean, secure, and in good condition. If a problem is found with any of the connections: correct the problem, and verify that diagnostic code CID 1079 FMI 08 is still active, before performing the following procedures.

Note: A CID 1079 FMI 08 can be triggered by other active, related, diagnostic codes. Always check for, and resolve, any other related and active diagnostic codes, before proceeding to troubleshoot this diagnostic code.

Note: The following test procedure may create other diagnostic codes. Ignore these created diagnostic codes now, but clear those codes after the original diagnostic code has been corrected.

Test Step 1. CHECK FOR ADDITIONAL RELATED DIAGNOSTIC CODES

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

2. Acknowledge any active diagnostic codes that are currently displayed on the message center.

3. Verify that no other related and active diagnostic codes are present.

Expected Result:

No other related and active diagnostic codes are present but CID 1079 FMI 08 is active.

Results:

• YES - No other related active diagnostic codes are present, but CID 1079 FMI 08 is still active. Go to test step 3.

• NO - Other related active diagnostic codes are present, but CID 1079 FMI 08 is still active. Go to test step 2.

Test Step 2. CLEAR ALL ACTIVE RELATED DIAGNOSTIC CODES

1. Perform all required Test Procedures to clear all other related, active diagnostic codes.

Expected Result:

All related active diagnostic codes are cleared and CID 1079 FMI 08 is no longer active.

Results:

• YES - All other related active diagnostic codes are cleared and CID 1079 FMI 08 is no longer active.

  Repair: The diagnostic codes do not exist at this time. Return the machine to normal operations.

  STOP

• NO - All other related active diagnostic codes are cleared, but CID 1079 FMI 08 is still active. Go to test step 3.

Test Step 3. INSPECT THE HARNESS CONNECTIONS

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

2. Inspect all Blade Tilt (X-axis Left/Right) circuit-related harness connections. Make sure that the connectors are clean and tight.

3. Check the mating of the connectors.

4. Check the wires at the connectors.

5. Check for nicks or abrasion signs in the insulation.

6. Check for moisture at the connectors.

7. Check for dirty contacts and/or corroded contacts.

8. Check each pin and check each socket.

Expected Result:

The machine harness is correct.

Results:

• YES - The machine harness is correct. Go to Test Step 4.

• NO - The machine harness is not correct.

  Repair: Repair or replace the machine harness.

  Go to Test Step 6.

Test Step 4. CHECK FOR A SHORT TO GROUND, OR A SHORT TO +BATTERY

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

2. Disconnect the machine harness connector from the Blade Tilt (X-axis Left/Right) position sensor.

3. Disconnect both the J1 and J2 harness connector from the machine ECM.

4. Measure resistance from the ECM connector contact J2-42 (wire H711-GN) to all contacts used in both the J1 and J2 ECM harness connectors.

Expected Result:

Each resistance measurement is greater than 5000 ohms.

Results:

• YES - Each resistance measurement is greater than 5000 ohms. The circuit harness connections are correct. Go to Test Step 5.

• NO - One or more of the resistance measurements are less than 5 ohms. The machine harness has failed.

  Repair: There is a short in the harness between wire H711-GN and the circuit with the low resistance measurement. Repair or replace the harness.

  Go to Test Step 6.

Test Step 5. CHECK FOR AN OPEN HARNESS

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

2. All previously disconnected harness connectors remain disconnected.

3. At the sensor harness connector, place a jumper wire between pin 3 (H711-GN) and pin 2 (J765-BU) in the sensor harness connector.

4. At the machine ECM, measure resistance from connector contact J1-56 (J765-BU) to connector contact J2-42 (H711-GN).

Expected Result:

The resistance measurement is less than 5 ohms.

Results:

• YES - The resistance measurement is less than 5 ohms. The sensor circuits connections are correct. Go to Test Step 6

• NO - The resistance measurement is greater than 5000 ohms. The sensor circuits connections are not correct.

  Repair: The sensor circuit is open in the harness. Repair or replace the harness.

  Go to Test Step 6.

Test Step 6. CHECK THE STATUS OF THE DIAGNOSTIC CODE

1. Reconnect all harness connectors. Make sure that the connectors are clean and fully seated. Observe that the clips on each connector are securely fastened.

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

3. Clear all inactive diagnostic codes.

4. Operate the machine.

5. Check the status of the CID 1079 FMI 08 diagnostic code.

Expected Result:

The diagnostic code is not active.

Results:

• YES - The diagnostic code is no longer active. The diagnostic code does not exist at this time. Return the machine to normal operation. STOP

• NO - The code is still active. The cause for the code has not been corrected.

  Repair: If you have not inspected the harness connectors in a previous Test Step, do that now.Clean the contacts of the harness connectors. Check the wires for damage to the insulation 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 sensor circuit.Perform a "wiggle test" on the sensor circuit of the machine wiring harness, using the Caterpillar Electronic Technician service tool. The "wiggle test" can be used to detect open or shorted connections in the machine wiring harness.Reconnect all harness connectors. Make sure that the connectors are fully seated. Observe that the clips for each connector are securely fastened. Perform Test Step 6 again.If the problem has NOT been found, and the original code is still active, the Scraper Transmission ECM may have failed.Prior to replacing an ECM, always contact your Dealership Technical Communicator for possible consultation with Caterpillar, or with the Dealer Solutions Network. This consultation may greatly reduce repair time.If the ECM needs to be replaced, see Testing and Adjusting, "Electronic Control Module (ECM) - Replace".

  STOP