SUPPORT 0990411 - Caterpillar

Illustration 1 g01157537
Schematic of the downshift solenoid
This diagnostic code is associated with the downshift solenoid. This diagnostic code is recorded when the Power Train/Chassis Electronic Control Module (ECM) reads the current of the solenoid as being above normal.The possible causes are listed:
A wire is shorted to ground.
The solenoid has failed.
The ECM has failed. This is unlikely.Note: The following test procedure may create other diagnostic codes. Ignore these created diagnostic codes and clear these diagnostic codes when the original diagnostic code has been corrected. Ensure that the diagnostic code of CID 0708 FMI 06 is active before performing this procedure.Note: Use the 146-4080 Digital Multimeter for the measurements in this procedure.System Response:The downshift solenoid is always off. The machine does not shift into lower gears. The machine will upshift normally. If the diagnostic code occurs and the transmission is in the neutral position, the transmission will remain in neutral position until the diagnostic code is corrected. Before normal operation can resume, the shift lever must return to the NEUTRAL position. If the diagnostic code occurs and the transmission is in any gear position but the neutral position, additional actions are not required. Normal operation can resume after the diagnostic code has been corrected.Test Step 1. CHECK THE SOLENOID
Turn the battery disconnect switch and the key start switch to the ON position.
Disconnect the machine harness from the solenoid.
At the machine harness connector for the solenoid, place a jumper wire from contact 1 (wire 704-GY(Grey)) to contact 2 (wire K972-BR(Brown)).
Observe the status of the diagnostic code. Expected Result:The diagnostic code is active. Then, the diagnostic code is not active as the jumper wire is installed and removed. Results:
YES - The circuit is correct. The solenoid has failed.Repair: Repeat this test "CHECK THE SOLENOID" in order to verify that the solenoid has failed. Replace the solenoid.STOP
NO - The diagnostic code remains active. Proceed to Test Step 2.Test Step 2. CHECK THE SOLENOID CIRCUIT FOR A SHORT TO GROUND
The machine harness remains disconnected from the solenoid.
Turn the key start switch and the battery disconnect switch to the OFF position.
Disconnect the J1 and J2 machine harness connector from the ECM.
At the J1 machine harness connector, measure the resistance from the solenoid contact J1-12 (wire 704-GY(Grey)) to all possible sources of frame ground. Expected Result:Each resistance measurement should be greater than 5 ohms.Results:
YES - The machine harness is correct. Proceed to Test Step 3.
NO - There is a short in the machine harness.Repair: The short is between the wire for the solenoid signal and the circuit with the low resistance measurement. Repair the machine harness or replace the machine harness.STOPTest Step 3. CHECK IF THE DIAGNOSTIC CODE REMAINS
Inspect the contacts of the harness connectors and clean the harness connectors.
Reconnect all the harness connectors.
Turn the battery disconnect switch and the key start switch to the ON position.
Operate the machine.
Check the status of the CID 0708 FMI 06. Expected Result:The CID 0708 FMI 06 is active. Results:
YES - The CID 0708 FMI 06 is active. The diagnostic