ENGINE AR 4151841 - Caterpillar

Illustration 1 g00894240
Problems with the transmission direction and speed control lever will cause the machine to respond incorrectly to the actions of the lever. Some problems with the transmission direction and speed control lever will cause the transmission to remain in the present speed and direction when a problem is detected. Other problems with the transmission direction and speed control lever will cause the transmission to shift to neutral.
View the status.
Use the Caterpillar Electronic Technician (ET) to view the status "Group 1 Gear Lever Parameters".
Actuate the transmission direction and speed control lever through all speeds in forward and reverse. Verify the positions on the display of the ET.
Operate the machine in all speeds and all directions. All speeds and all directions may not be available.Expected Result: The fault is NOT present.Results:
OK - The fault is NOT present. Suspect an intermittent fault. STOP.
NOT OK - The fault is still present. Document the positions which are not correct on the display of the ET. Proceed to Step 2.
Check the harness.
Check the harness connectors and the harness from the transmission direction and speed control lever to the power train electronic control module (ECM).
Thoroughly inspect the connectors for the transmission direction and speed control lever and the connectors for the power train ECM.
Visually inspect the harness wiring from the transmission direction and speed control lever to the power train ECM.
Use the ET to view the status "Group 1 Gear Lever Parameters".
Actuate the transmission direction and speed control lever through all speeds in forward and reverse. Verify the positions on the display for the ET.
Operate the machine in all speeds and all directions. All speeds and all directions may not be available.Expected Result: The harness and harness connectors are correct. The fault is NOT present.Results:
OK - The harness and the harness connectors are correct. The fault is NOT present. Proceed to Step 3.
NOT OK - The harness and/or the harness connectors are NOT correct and the fault is still present. Repair the machine harness and/or the harness connectors. If necessary, replace the machine harness and/or the harness connectors. Ensure that all the seals are properly in place. Also, check that the connectors mate completely. Verify that the repair eliminates the problem. Clear all diagnostic codes. STOP.
Check the voltage.
Disconnect the transmission direction and speed control lever from the machine harness.
With the key start switch in the ON position, measure the voltage between pin 1 and pin 3 of the 12-pin connector for the transmission direction and speed control lever.Expected Result: System voltage is present. Results:
OK - System voltage is present. Proceed to Step 4.
NOT OK - System voltage is NOT present. There is a problem with the power supply to the transmission direction and speed control lever. Check the fuse for the transmission direction and speed control lever and the associated harness. STOP.
Check the continuity.
Ensure that the key start switch is in the OFF position.
The transmission direction and speed control lever and the power train ECM are disconnected from the machine harness.
Check for continuity from