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ENGINE AR-COMPLETE 1399780 - Caterpillar

1399780 ENGINE AR-COMPLETE Caterpillar parts C-12 ENGINE
Alternative (cross code) number:
Caterpillar 1399780 ENGINE AR-COMPLETE

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TRUCK ENGINE  C-12   Caterpillar
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Machine ECM
The following is a list of diagnostic codes (SPN) that are associated with the switch circuits of the machine.
Table 1
Machine ECM (MID 39)
SPN-FMI Code Description System Response
70-2 Parking Brake Switch: Data erratic, intermittent, or incorrect Disable Propel and Vibe
Fault Level - 3 Possible causes for an FMI 2 Diagnostic code are:
The wire is intermittently shorted to the ground circuit while the machine is in operation.
The wire is intermittently shorted to + battery.
An intermittent open circuit exists.
The ECM has failed. ECM failure is unlikely.
Illustration 1 g03816247
Schematic of the switch circuits
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.For the full Electrical Schematic of the Soil Compactors in this manual, refer to the appropriate media listed below.
For models CS54B and CP54B refer to Electrical Schematic, UENR6386.
For models CS56B, CP56B, CS64B, CS66B, CS68B and CP68B refer to Electrical Schematic, UENR6388.
For models CS74B, CP74B, CS76B and CS78B refer to Electrical Schematic, UENR6384.
Table 2
Contacts Closed states of the "Park Brake Switch"
Switch Position Brake Function LED Indicator
ON 2 & 3 5 & 6
OFF 2 & 1 5 & 4 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 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 this diagnostic code is active before performing a troubleshooting procedure.
Identify the active FMI code associated with the components.
Determine which code is present and use the list below to determine which procedure to follow.
FMI 2 diagnostic code, proceed to Table 3.
Table 3
FMI 2 Troubleshooting
Troubleshooting Test Steps Values Results
1. Check The Harness
A. Turn the disconnect switch and the key start switch OFF.
B. Inspect all harness connections. Make sure that the connectors are clean and tight.
C. Check the connectors for proper mating. Ensure that all the seals are present and in place.
D. Check the harness for signs of damage or abrasion.
E. Check the wires at the connector. Ensure that the wires are secured tightly into the connector. Take care not to pull the wire out of the connector.
F. Check the exposed wires at the connectors for nicks or signs of abrasion.
G. Check for moisture inside the connector.
The machine harness connectors are tight and free of corrosion. OK - The machine harness connectors are tight and free of corrosion.
Proceed to Test Step 2.
NOT OK - The machine harness connectors are in need of repair.
Repair: Repair or replace the machine harness.
Proceed to Test Step 3.
2. Check The Harness For An Open
A. Turn the key start switch and the disconnect switch to the OFF position.
B. Disconnect the machine harness connector from the switch.
C. Disconnect the machine harness connectors from the ECM.
D. At the harness

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