120M Series 2, 12M Series 2, 140M Series 2 and 160M Series 2 Motor Graders Power Train Electronic Control System Caterpillar

Illustration 1	g02117295
Circuit of the "Transmission Pump Bypass Solenoid"

This diagnostic code is associated with the "Transmission Pump Bypass Solenoid". The FMI 06 diagnostic code means that the "Transmission/Chassis ECM" has determined that the current of the solenoid circuit is above normal.

Some possible causes of this diagnostic code are listed below:

• 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, that all connections are secure and that all the 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.

Use a calibrated digital multimeter for the following procedures.

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.

Test Step 1. CHECK THE SOLENOID

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

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 3210 FMI 06 diagnostic code changes to a CID 3210 FMI 05 diagnostic code when the solenoid is disconnected.

Results:

• YES - The active CID 3210 FMI 06 diagnostic code changes to a CID 3210 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 3210 FMI 06 diagnostic code 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 connectors J1 and J2 from the "Transmission/Chassis ECM".

4. At the machine harness connectors of the ECM, measure the resistance from the contact J1-55 (wire K927-BU(Blue)) to frame ground. Measure the resistance from the contact J1-55 (wire K927-BU(Blue)) to all of the other J1 and J2 contacts that are used in the connectors of the "Transmission/Chassis ECM".

Expected Result:

Each resistance measurement is greater than 5000 ohms.

Results:

• OK - Each resistance measurement is greater than 5000 ohms. The machine harness is correct. Proceed to Test Step 3.

• NOT OK - One or more of the resistance measurements is less than 5000 ohms. There is a short in the machine harness. The short is between wire K927-BU(Blue) and the circuit with the low resistance measurement.

  Repair: 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 the machine harness.

  STOP

Test Step 3. CHECK THE STATUS OF THE DIAGNOSTIC CODE

1. Inspect the harness connectors. Clean the contacts of the harness connectors.

2. Check the wires for damage to the insulation that is caused by excessive heat, battery acid, or chafing.

3. Perform a 45 N (10 lb) pull test on each of the wires that are associated with the sensor circuit.

4. Reconnect all harness connectors. Make sure that the connectors are fully seated. Observe that the clips for each connector are completely fastened.

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

6. Operate the machine.

7. Check the status of the CID 3210 FMI 06 diagnostic code.

Expected Result:

The CID 3210 FMI 06 diagnostic code is still active.

Results:

• YES - The CID 3210 FMI 06 diagnostic code is still active. The diagnostic code has not been corrected.

  Repair: Check the circuit again. Use the Caterpillar Electronic Technician (Cat ET) service tool, in order to perform a wiggle test on the machine wiring harness. The wiggle test can detect 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, 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 "Transmission/Chassis ECM". If the ECM must be replaced, refer to the Testing and Adjusting, "Electronic Control Module (ECM) - Replace" Section of this manual.

  STOP

• NO - The CID 3210 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