CARRIER-PLANETARY 9W3083 - Caterpillar

Machine ECM
The following is a list of diagnostic codes (SPN) that are associated with the relays of the machine.
Table 1
Machine ECM (MID 39)
SPN-FMI Code Description System Response
818-14 Master Control Relay: Special Instruction De-energize Relay
Fault Level - 1 A relay is a component that uses a small amount of electrical current to control the state of a circuit. The circuit is either opened or closed. Possible causes for an FMI 14 diagnostic code are:
A short to ground exists.
The supply circuit is open.
The return circuit is open.
The relay has failed.
The ECM has failed. A failure of the ECM is unlikely.
Illustration 1 g03828529
Schematic of the relay circuits
Note: The diagram above is a simplified schematic of the Machine ECM connections. The schematic is electrically correct. However, not all of the possible harness connectors are shown. Refer to the latest revision of Electrical Schematic, UENR6464 for the complete schematic.Diagnostic Trouble Code Procedure
Note: Prior to beginning this procedure, inspect the harness connectors that are involved in this 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. Check the wiring harness for pinch points or abrasions. Look for and repair areas that indicate wires are exposed. If a problem with a connection is found, correct the problem and verify that the diagnostic code is active before performing a troubleshooting procedure.
Table 2
FMI 14 Troubleshooting
Troubleshooting Test Steps Values Results
1. Check The Return Circuit For A Short To Ground
A. Turn key switch and disconnect switch OFF.
B. Disconnect the Relay from the machine harness.
C. Disconnect the machine harness connectors from the ECM.
D. At the ECM machine harness connector, measure the resistance between the signal contact and all other contacts that are used in the ECM.
Each resistance measurement is greater than 5K Ω. OK - Each resistance measurement is greater than 5K Ω. The machine harness is correct.
Proceed to Test Step 2.
NOT OK - Each resistance measurement is not greater than 5K Ω. A short circuit exists between the signal circuit and the circuit with the 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 connection or a corroded connection in the circuit. A resistance measurement that is greater than 5K Ω would indicate an open in the circuit.
Proceed to Test Step 3.
2. Check The Harness For An Open
A. The key start switch and disconnect switch remain in the OFF position.
B. The the machine harness connectors remain disconnected from the ECM.
C. Place a jumper wire between the Signal wire and the Signal return.
D. At the ECM machine harness connector, measure the resistance between the signal contact and the return contact.
The resistance is less than 5 Ω. OK - The resistance is less than 5Ω. The machine harness is correct.
Proceed to Test Step 3.
NOT OK - The resistance is greater than 5 Ω. The resistance measurement is not correct. There is an open circuit in