14L Motor Grader Implement Electronic Control System Caterpillar

Illustration 1	g01270366
Articulate Left Solenoid connections

This diagnostic code is associated with the articulate left solenoid. The FMI 06 means that the Implement ECM has determined that the current of the solenoid circuit is above normal.

The Implement ECM provides a PWM output signal to the solenoid in order to provide proportional control of the solenoid. The ECM will vary the electrical current of the PWM output signal based on the input command that is received from the articulation lever position sensor that is located in the left joystick assembly.

Some possible causes of this diagnostic code are listed:

• The energize circuit of the solenoid is shorted to ground.

• The solenoid has failed.

• 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, 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 these diagnostic codes when the original diagnostic code has been corrected.

Note: The resistance of the solenoid coil should be 8.7 ± .4Ω at 25 °C (77.0 °F).

Test Step 1. CHECK THE SOLENOID

1. Turn the disconnect switch and the key start switch to the ON position. Do not start the engine.

2. Observe the status of the diagnostic code.

3. Disconnect the solenoid with the active diagnostic code from the machine harness.

Expected Result:

The active CID 2171 FMI 06 diagnostic code changes to a CID 2171 FMI 05 diagnostic code when the solenoid is disconnected.

Results:

• YES. - The active CID 2171 FMI 06 diagnostic code changes to a CID 2171 FMI 05 diagnostic code when the solenoid is disconnected. The circuit is correct.

  Repair: The solenoid has failed. Repeat this test "CHECK THE SOLENOID" in order to verify the solenoid failure. Replace the solenoid.

  STOP

• NO. - The CID 2171 FMI 06 remains active when the solenoid is disconnected. The solenoid is not causing the problem. Proceed to Test Step 2.

Test Step 2. CHECK THE ENERGIZE CIRCUIT OF THE SOLENOID FOR A SHORT TO GROUND

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

2. The solenoid remains disconnected from the machine harness.

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

4. At the machine harness ECM connectors, measure the resistance from the signal contact J1-51 (wire K789-YL(Yellow)) to frame ground. Measure the resistance from the signal contact J1-51 (wire K789-YL(Yellow)) to all of the other J1 and J2 contacts that are used in the ECM connectors.

Expected Result:

Each resistance measurement is greater than 5kΩ.

Results:

• OK. - Each resistance measurement is greater than 5kΩ. The machine harness is correct. Proceed to Test Step 3.

• NOT OK. - One or more of the resistance measurements is less than 5kΩ. There is a short in the machine harness. The short is between wire K789-YL(Yellow) and the circuit with the low resistance measurement.

  Repair: Refer to Testing and Adjusting, "Wiring Harness (Short Circuit) - Test" for more information on finding and correcting a short circuit. 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 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. Check the status of the CID 2171 FMI 06 diagnostic code.

Expected Result:

The CID 2171 FMI 06 diagnostic code is still active.

Results:

• YES. - The CID 2171 FMI 06diagnostic code is still active. The diagnostic code 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 have failed.

  It is unlikely that the ECM has failed. Verify that all possible causes of the diagnostic code have been investigated. If the cause of the failure is not found, replace the ECM. 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 cause of the diagnostic code is not found, replace the ECM that has activated the diagnostic code. Refer to Testing and Adjusting, "Electronic Control Module (ECM) - Replace".

  STOP

• NO. - The CID 2171 FMI 06 is not active. The diagnostic code 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