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BOOT 0878404 - Caterpillar

0878404 BOOT Caterpillar parts BOOT
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Caterpillar 0878404 BOOT

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Transmission ECM
The following is a list of codes that are associated with the Condition Switch (Switch to Ground) circuits of the Transmission ECM.
Table 1
Transmission ECM (MID 81)    
DTC    Code Description    System Response    
954-2     Loss of Rotor Lift Lock Switch signal     The rotor lower functionality will be disabled while this code is active (raise is still allowed).
This sensor only detects if this lock is engaged or not. The lock will still be operable when the sensor is faulted.    The Rotor Lift Lock Switch is connected to two inputs of the ECM. One contact is open and the other contact is grounded during proper operation.
Possible Causes for an FMI 2 Diagnostic Code are:
A short to ground.
A short to power.
An open wire.
The switch has failed.
A loose or resistive connection.
The ECM has failed. A failure of the Machine ECM is unlikely.
Illustration 1 g03714730
Schematic of the Rotor Lift Lock Switch circuit associated with the Transmission ECM.Note: The diagram above is a simplified schematic of the ECM switch connections. The schematic is electrically correct, however, not all of the possible harness connectors are shown. Refer to the latest revision of Electrical Schematic (T4), UENR2467 or Electrical Schematic (LRC), UENR2468 for the complete schematic.
Table 2
Rotor Lift Lock Switch    
Switch Position    K715-PK Circuit
J2-52    K716-PU Circuit
Off     Open     Closed    
On     Closed     Open    Note: On = lock is engaged and preventing the rotor from lowering.Diagnostic Trouble Code Procedure
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 connections in the circuit are clean, secure and in good condition. If a problem with a connection is found, correct the problem and verify that this diagnostic code is active before performing this procedure.
Table 3
Troubleshooting Test Steps    Values    Results    
Begin Process For FMI 2 Troubleshooting HERE    
1. Check The Switch
A. Turn the key start switch and the disconnect switch to the OFF position.
B. Disconnect the machine harness connector from the switch.
C. At the machine harness connector for the switch, measure resistance between the ground contact and frame ground.    
The resistance from the ground contact and frame ground is less than 5Ω.     OK. - The resistance from the ground contact and frame ground is less than 5Ω. The machine harness and the ECM are correct.
Proceed to Test Step 3.
NOT OK.- The resistance from the ground contact and frame ground is greater than 5Ω.
Proceed to Test Step 2.    
2. Check The Harness
A. Turn the key start switch and the disconnect switch to the OFF position.
B. The machine harness connector remains disconnected from the switch.
C. Disconnect the J1 and J2 machine harness connector from the ECM.
D. At the connector for the Transmission ECM harness, measure the resistance from the (N/O) and (N/C) contacts to all the contacts used for the ECM.    
Each resistance is greater than 5KΩ.     OK.

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