3966750 DISTRIBUTION AR Caterpillar parts 312D L
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Compatible equipment models: 3966750:
Illustration 1 g01776315
Connections of the number 6 solenoid (first gear)This diagnostic code is associated with the first gear solenoid. The FMI 05 code means that the ECM has determined that the current is below normal.The possible causes of this diagnostic code are listed below:
The solenoid energizer circuit of the modulating valve is open.
The return circuit of the modulating valve is open.
The solenoid has failed.
The ECM has failed. This situation is unlikely.Before performing this procedure, inspect the harness connectors that are involved in the circuit. Poor connections can often be the cause of a problem in an electrical circuit. Verify that all of the connections in the circuit are clean and secure. If a problem with a connection is found, correct the problem and verify that this diagnostic code is active before performing this procedure.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 1406 FMI 05 is active before performing this procedure.Note: Use the 146-4080 Digital Multimeter for the measurements in this procedure.System Response:When this diagnostic code is active, the ECM will turn off the current to the failed solenoid.Test Step 1. CHECK THE SOLENOID
Turn the disconnect switch and the key start switch to the ON position. Do not start the engine.
Disconnect the solenoid with the active diagnostic code from the transmission harness.
At the connector of the transmission harness for the solenoid, place a jumper wire from contact J2-3 (wire 922-BR) to contact J2-1 (wire 901-WH).
Observe the status of the CID 1406 FMI 05 diagnostic code.Expected Result:The CID 1406 FMI 05 diagnostic code remains active. Results:
YES - The diagnostic code remains active. The jumper wire does not affect the diagnostic code. Proceed to Test Step 2.
NO - The diagnostic is no longer active. The solenoid has failed.Repair: The solenoid has failed. Repeat this Test Step "CHECK THE SOLENOID" in order to verify the solenoid failure. Replace the solenoid. Verify that the new solenoid corrects the problem.STOPTest Step 2. CHECK THE HARNESS FOR AN OPEN
Turn the key start switch and the disconnect switch to the OFF position.
Disconnect the connector of the transmission harness from the ECM.
The jumper wire that was installed in the previous test remains in place.
At the connector of the transmission harness, measure the resistance from signal contact J2-3 (wire 922-BR) to contact J2-1 (wire 901-WH).
At the connector of the transmission harness, measure the resistance from signal contact J2-3 (wire 922-BR) to contact J2-1 (wire 901-WH).Expected Result:Both resistances are less than 5.0 ohms.Results:
OK - Both resistances are less than 5.0 ohms. The transmission harness is correct. Proceed to Test Step 3.
NOT OK - Either resistance is greater than 5000 ohms. The resistance measurement is not correct. There is an open circuit in the transmission harness.Repair: The open is in wire 901-WH or in wire 922-BR of the transmission harness. Repair the transmission harness or replace the transmission harness.STOPTest Step 3. CHECK IF THE
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