DEFLECTOR 7J8573 - Caterpillar

Illustration 1 g01340975
Connections of the autoshift switch
The autoshift switch has two inputs for the ECM. The inputs are Normally Open or Normally Closed. During normal operation, one of the inputs is open and the other input is grounded. A failure is detected when the Normally Open input and the Normally Closed input are in the same state. This diagnostic code is recorded when the Normally Open input and the Normally Closed input are in the same state. The possible causes of the problem are listed below:
There is an Open wire between F849-WH(White) and the ECM.
There is an Open wire or a grounded wire between F848-OR(Orange) and the ECM.
There is an Open or a grounded wire between F849-WH(White) and the ECM.
The switch has failed.
The ECM has failed. This is unlikely. Test Step 1. CHECK THE NORMALLY CLOSED CIRCUIT FOR PROPER OPERATION.
Turn the key start switch and the disconnect switch to the OFF position.
Disconnect the machine harness from the ECM.
At machine harness connector J1, measure the resistance from contact J1-44 to contact J2-2. Expected Result:With the autoshift switch in the ON position, the resistance should measure more than 5000 ohms. With the autoshift switch in the OFF position, the resistance should measure less than 5 ohms. Results:
OK - With the autoshift switch in the ON position, the resistance is more than 5000 ohms. With the autoshift switch in the OFF position, the resistance is less than 5 ohms. Proceed to Test Step 3.
NOT OK - The switch or the machine harness has failed. Proceed to Test Step 2.Test Step 2. CHECK THE NORMALLY CLOSED CIRCUIT OF THE SWITCH.
Disconnect the autoshift switch from the machine harness.
At the switch, measure the resistance between contact 1 and contact 2. Measure the resistance between contact 3 and contact 2. Expected Result:With the autoshift switch in the ON position, the resistance should measure more than 5000 ohms. With the autoshift switch in the OFF position, the resistance should measure less than 5 ohms. Results:
OK - With the autoshift switch in the ON position, the resistance is more than 5000 ohms. With the autoshift switch in the OFF position, the resistance is less than 5 ohms. Repair: The machine harness has failed. Either the Normally Closed circuit (F849-WH(White)) or the return circuit (202-BK(Black)) is open or grounded in the machine harness. Repair the machine harness or replace the machine harness.STOP
NOT OK - The switch has failed.Repair: Replace the autoshift switch. Verify that the new switch corrects the problem.STOPTest Step 3. CHECK THE NORMALLY OPEN CIRCUIT FOR PROPER OPERATION.
At machine harness connector J1, measure the resistance from contact J1-45 (Normally Open contact) to contact J2-2. Expected Result:With the autoshift switch in the ON position, the resistance should measure less than 5 ohms. With the autoshift switch in the OFF position, the resistance should measure more than 5000 ohms. Results:
OK - With the autoshift switch in the ON position, the resistance is less than 5 ohms. With the autoshift switch in the OFF position, the resistance is more than