320E and 323E Excavators Machine Electronic Control System MID 299, 1193-3 Caterpillar

Conditions Which Generate This Code:

Illustration 1	g06009723
Schematic of the Boom Cylinder Extend Solenoid

This diagnostic code is associated with the Boom Cylinder Extend solenoid. The FMI "03" means that the Machine ECM detected that the voltage is above normal.

The possible causes of this failure are listed below:

• The solenoid energizer circuit is shorted to +battery.

• The Machine ECM has failed. This condition is unlikely.

When the diagnostic code occurs, a warning is displayed on the operator monitor and the hydraulic system is disabled.

Test Step 1. CHECK THE SOLENOID ENERGIZER CIRCUIT FOR A SHORT TO +BATTERY.

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

2. Disconnect the suspect solenoid from the machine harness.

3. Disconnect the machine harness connectors from the Cat^® Grade Control ECM.

4. Measure the voltage at the circuits that are listed here:

   • Contact 1 (wire K762-BU(Blue)) of the machine harness connector for the solenoid to frame ground.

   • Contact 2 (wire K763-GY(Grey)) of the machine harness connector for the solenoid to frame ground.

   • Contact 1 (wire K762-BU(Blue)) to contact 2 (wire K763-GY(Grey)) of the machine harness connector for the solenoid.

Expected Result:

Each voltage measurement is approximately 0.0 ± 0.5 DCV.

Results:

• OK - Each voltage measurement is approximately 0.0 ± 0.5 DCV. The voltage is correct. Proceed to test step 2.

• NOT OK - Each voltage measurement is greater than approximately 0.0 ± 0.5 DCV. The voltage is not correct. The machine harness is shorted to +battery. Proceed to test step 2.

Test Step 2. CHECK IF THE DIAGNOSTIC CODE REMAINS.

1. Inspect the contacts of the harness connectors and clean the contacts.

2. Reconnect all machine harness connectors.

3. Turn the key start switch to the ON position.

4. Clear any active events that are displayed on the operator monitor.

5. Operate the machine.

6. Check if the diagnostic code is displayed on the operator monitor. The diagnostic information may also be viewed with the Cat^® ET.

Expected Result:

The diagnostic code for the solenoid is NOT present on the operator monitor.

Results:

• YES - The diagnostic code is NOT present. The diagnostic code does not exist currently. The initial failure 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

• NO - The diagnostic code has NOT been corrected. The machine ECM has failed. A failure of the ECM is unlikely. Exit this procedure and perform this procedure again.

  Repair: If the cause of the failure is not found, replace the Machine ECM. See Testing And Adjusting, "Electronic Control Module (ECM) - Replace".

  STOP