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Table 1
J1939 Code and Description CDL Code and Description Comments
611-5
System Diagnostic Code #1 : Current Below Normal N/A This code indicates that there is a problem with the engine starter motor solenoid and/or the electrical circuit on the ECM.
611-6
System Diagnostic Code #1 : Current Above Normal N/A This code indicates that there is a problem with the engine starter motor solenoid and/or the electrical circuit on the ECM.
677-5
Engine Starter Motor Relay : Current Below Normal 444-5
Starter Motor Relay : Current Below Normal This code indicates that there is a problem with the engine starter motor relay and/or the electrical circuit on the ECM.
677-6
Engine Starter Motor Relay : Current Above Normal 444-6
Starter Motor Relay : Current Above Normal This code indicates that there is a problem with the engine starter motor relay and/or the electrical circuit on the ECM.
931-5
Engine Fuel Supply Pump Actuator : Current Below Normal 1627-5
Fuel Pump Relay : Current Below Normal This code indicates that there is a problem with the fuel supply pump actuator and/or the electrical circuit on the ECM.
931-6
Engine Fuel Supply Pump Actuator : Current Above Normal 1627-6
Fuel Pump Relay : Current Above Normal This code indicates that there is a problem with the fuel supply pump actuator and/or the electrical circuit on the ECM.
4210-5
Engine Pre-lube Drive : Current Below Normal 338-5
Engine Pre-Lube Pump Relay : Current Below Normal This code indicates that there is a problem with the prelubrication solenoid and/or the electrical circuit on the ECM.
4210-6
Engine Pre-lube Drive : Current Above Normal 338-6
Engine Pre-Lube Pump Relay : Current Above Normal This code indicates that there is a problem with the prelubrication solenoid and/or the electrical circuit on the ECM.
7102-5
Engine Fuel Filter Circulating Pump : Current Below Normal 4550-5
Electric Fuel Transfer Pump Relay : Current Below Normal This code indicates that there is a problem with the fuel priming solenoid valve and/or the electrical circuit on the ECM.
7102-6
Engine Fuel Filter Circulating Pump : Current Above Normal 4550–6
Electric Fuel Transfer Pump Relay : Current Above Normal This code indicates that there is a problem with the fuel priming solenoid valve and/or the electrical circuit on the ECM. Electrical Checkouts on the Cat® Electronic Technician (ET)
Table 2
Component Electrical Checkout
Engine Starter Solenoid Attempt to start the engine. Once the ECM attempts to energize the solenoid, the code will become active. Refer to the application-specific schematic for the "Engine Starter Motor Solenoid" wiring circuit.
Engine Starter Motor Relay Attempt to start the engine. Once the ECM attempts to energize the solenoid, the code will become active. Refer to the application-specific schematic for the "Engine Starter Motor Relay" wiring circuit.
Prelubrication System Relay Prelubrication Relay Override
Engine Fuel Supply Pump Actuator Fuel Pump Relay Command Override
Priming Solenoid Valve Electric Fuel Transfer Pump Relay Override
Table 3
Troubleshooting Test Steps Values Results
1. Check for Codes
A. Connect Cat® Electronic Technician (ET) to the service tool connector.
B. Determine if a code is active or logged.
Codes
Result: A -5 code is active or logged.
Proceed to Test Step 2.
Result: A -6 code is active or logged.
Proceed to Test Step 3.
2. Check the Wiring for an Open Circuit
A. Verify that the harness connector is free of debris, free of corrosion and securely connected.
B. Disconnect the solenoid from the harness.
C. Connect a jumper wire between the terminals of the harness connector for the affected coil. The coil is replaced with a short circuit.
Create a Short
Result: A -5 code became active during the electrical checkout. The ECM did not detect the jumper wire. There is an open circuit in the wiring between the coil and the ECM connector. There may be a problem with a connector.
Repair: Repair or replace the connectors or the wiring.
Verify that the repair eliminated the problem.
Result: A -6 code is activated during the electrical checkout. The ECM detected the jumper wire. There is a problem with the solenoid.
Repair: Replace the solenoid.
Verify that the repair eliminated the problem.
3. Check the Wiring for a Short Circuit
A. Disconnect the solenoid from the harness.
Create an Open
Result: A -6 code became active during the electrical checkout. The ECM did not detect the open circuit. There is a short circuit in the wiring between the coil and the ECM connector. There may be a problem with a connector.
Repair: Repair or replace the connectors or the wiring.
Verify that the repair eliminated the problem.
Result: A -5 code is activated during the electrical checkout. The ECM detected the open circuit. There is a problem with the solenoid.
Repair: Replace the solenoid.
Verify that the repair eliminated the problem.
If the procedure did not correct the issue, contact your Cat dealer Technical Communicator (TC). For further assistance, your TC can confer with the Dealer Solutions Network (DSN).