HOUSING 4451678 - Caterpillar

Illustration 1 g03096977
Schematic of the "Power Shift" Solenoid CircuitThis diagnostic code is associated with the "power shift" solenoid. The FMI 05 means that the ECM has determined that an open in the circuit exists. The possible causes of this diagnostic code are listed below:
The energize circuit of the solenoid is open.
The return circuit of the solenoid is open.
The solenoid has failed.
The ECM has failed. This is unlikely.
The switch may have failed.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 0581 FMI 05 is active before performing this procedure.Note: Use the 146-4080 Digital Multimeter for the measurements in this procedure.Test Step 1. CHECK THE SWITCH.
Table 1
Status of Switch Circuit    
CID/
Switch Switch
State Switch Contacts    Status    
CID 0581
Backup Switch     Activated     Contacts 5 & 6     Continuity    
Not Activated Contacts 5 & 4     Open    
Turn the key start switch and the disconnect switch to the OFF position.
Disconnect the backup switch from the panel.
Check the continuity of the switch from contact 5 to contact 6.
Toggle the switch and recheck the continuity of the switch from contact 5 to contact 4.Expected Result:The continuity agrees with table 1.Results:
OK - The continuity of the switch is correct. Proceed to Test Step 2.
NOT OK - The continuity of the switch is NOT correct.Repair: Replace the switch. Proceed to Test Step 4.Test Step 2. CHECK THE SOLENOID.
Reconnect the backup switch.
Turn the disconnect switch and the key start switch to the ON position. DO NOT start the engine.
Disconnect the machine harness from the solenoid.
At the machine harness connector for the solenoid, place a jumper wire from contact 1 (wire A768-BU) to contact 2 (wire A769-GY).
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 3.Test Step 3. CHECK THE SOLENOID CIRCUIT FOR AN OPEN.
Turn the key start switch and the disconnect switch to the OFF position.
Disconnect the J1 and J2 machine harness connectors from the ECM.
At the machine harness connector for the solenoid, the jumper wire remains installed.
At J2 machine harness connector, measure the resistance from contact J2-7 (wire L969-WH) to J2-19 (wire L968-OR). Expected Result:The resistance should be less than 5000 ohms.Results:
YES - The resistance is less than 5000 ohms. The machine harness is correct. Proceed to test step 4.
NO - The resistance measurement is NOT correct. There is an open circuit in the machine harness.Repair: The open is in the wire for the solenoid signal or in wire (L968-OR) of the machine harness. Repair the machine harness or replace the machine harness.STOPTest Step 4. CHECK IF THE DIAGNOSTIC CODE