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

Illustration 1	g03841894
Schematic of the Inertial Measurement Unit Sensor

The CID 1893 is associated with the Inertial Measurement Sensor. The FMI 12 is recorded when the internal component or components failed.

Note: The inertial measurement sensor is directly tied to the Transmission Chassis ECM through the Auto Can data link.

Test Step 1. CHECK HARDWARE MOUNTING LOCATION

1. Check the inertial sensor mounting location to see if sensor is mounted loosely.

Expected Result:

The inertial sensor is mounted correctly and tightly.

Results:

• OK - The inertial sensor is mounted correctly. Proceed to Test Step 2.

• NOT OK - Inertial sensor is loosely mounted.

  Repair: Tighten the inertial sensor mounting bolts.

  Proceed to Test Step 2.

Test Step 2. RECHECK FOR DIAGNOSTIC CODES.

1. Ensure that the diagnostic code is active.

2. Cycle power to the Inertial Measurement Unit Sensor and the Transmission Chassis ECM.

Expected Result:

The diagnostic code is inactive.

Results:

• OK - The diagnostic code is not active.

  Repair: Clear the logged diagnostic code.

  STOP

• NOT OK - The diagnostic code is still active.

  Repair: Replace the Inertial Measurement Unit Sensor. Perform this procedure again after the sensor has been replaced, to ensure that the diagnostic code is no longer active.

  STOP