SEAL-O-RING 1863075 - Caterpillar

Transmission ECM
The following is a list of Diagnostic Trouble Codes (DTCs) related to the Transmission ECM relays.
Table 1
Transmission ECM (MID 027)
DTC Code Description System Response
444-03 Starter Motor Relay: Voltage Above Normal Starter motor will not function.
444-05 Starter Motor Relay: Current Below Normal Starter motor will not function.
444-06 Starter Motor Speed Relay: Current Above Normal Starter motor will not function. Possible Causes for an FMI 03 Diagnostic code are:
The relay circuit is shorted to the +Battery circuit.
The ECM has failed (unlikely).Possible Causes for an FMI 05 Diagnostic code are:
The energize circuit of the relay is open.
The return circuit of the relay is open.
The relay has failed.
The ECM has failed (unlikely).Possible Causes for an FMI 06 Diagnostic code are:
The energize circuit of the relay is shorted to ground.
The relay has failed.
The ECM has failed (unlikely).
Illustration 1 g03139516
Connections of the starter relay
Diagnostic Trouble Code Procedure
Note: 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 the diagnostic code is active before performing this procedure.Note: Use a Digital Multimeter for the measurements in this procedure.
Table 2
Troubleshooting Test Steps Values Results
1. Identify Active FMI Code Associated With Relay Circuit
Code present. FMI 03 diagnostic code, proceed to Test Step 2.
FMI 05 diagnostic code, proceed to Test Step 3.
FMI 06 diagnostic code, proceed to Test Step 5.
Begin Process For FMI 03 Troubleshooting HERE
2. Check The Relay Circuit For A Short To +Battery
A. Turn key start switch and disconnect switch OFF.
B. Disconnect the machine harness connectors from the relay and the ECM.
C. At the machine harness connector for the ECM, measure the resistance from the Starter Relay (+) contact to all other contacts that are used in the machine harness connector for the ECM.
Each reading greater than 5K Ω. OK - All resistance measurements are greater than 5K Ω.
Proceed to Test Step 7.
NOT OK - One or more readings are less than 5 Ω.
Each resistance measurement is not greater than 5 Ω. There is a short in the machine harness. The short is between the Starter Relay (+) contact and the circuit that has a low resistance measurement.
Repair - Repair or replace the machine harness.
Note: A resistance that is greater than 5 Ω but less than 5K Ω would indicate a loose or corroded connection in the circuit. A resistance measurement that is greater than 5K Ω would indicate an open in the circuit.
STOP
Begin Process For FMI 05 Troubleshooting HERE
3. Check The Relay
A. Turn the disconnect switch and the key start switch to the ON position. Do not start the engine.
B. Disconnect the relay with the active diagnostic code from the machine harness.
C. At the machine harness connector for the relay, place a jumper wire from contact 1 to contact 2.
D. Observe the status of the code.