621H, 623H and 627H Wheel Tractor-Scrapers Implement Electronic Control System Caterpillar

This diagnostic code is recorded when the ECM determines that the position sensor is out of calibration.

The possible causes of this diagnostic code are listed:

• The machine serial number that is programmed in to the Caterpillar Monitoring System has changed since the last calibration.

• The Implement control ECM has been replaced.

• The ECM has failed. The failure of ECM is unlikely.

Test Step 1. RECALIBRATE THE POSITION SENSOR

Recalibrate the position sensor. See Testing and Adjusting, "Implement Control Lever - Calibrate".

Expected Result:

A successful calibration causes this diagnostic code to become inactive.

Results:

• YES - The calibration causes this diagnostic code to become inactive. Resume normal machine operation.STOP

• NO - The calibration has not caused the diagnostic code to become inactive.

  Repair: Go to Troubleshooting, "Joystick Calibration Is Not Successful" in order to continue troubleshooting.

  STOP