7024 Mercruiser WASHER, CONDENSOR TERMINAL STUD

Table 1
J1939 Code and Description CDL Code and Description Comments
678-3
ECU 8 Volts DC Supply : Voltage Above Normal 41-3
8 Volt DC Supply : Voltage Above Normal The code is logged.
678-4
ECU 8 Volts DC Supply : Voltage Below Normal 41-4
8 Volt DC Supply : Voltage Below Normal The code is logged.
3509-3
Sensor Supply Voltage 1 : Voltage Above Normal 262-3
5 Volt Sensor DC Power Supply : Voltage Above Normal The code is logged.
All sensors are set to default values.
3509-4
Sensor Supply Voltage 1 : Voltage Below Normal 262-4
5 Volt Sensor DC Power Supply : Voltage Below Normal The code is logged.
All sensors are set to default values.
3510-3
Sensor Supply Voltage 2 : Voltage Above Normal 2131-3
5 Volt Sensor DC Power Supply #2 : Voltage Above Normal The code is logged.
Engine power may be derated.
3510-4
Sensor Supply Voltage 2 : Voltage Below Normal 2131-4
5 Volt Sensor DC Power Supply #2 : Voltage Below Normal The code is logged.
Engine power may be derated.
Table 2
Sensor Supply Sensor Supply ECM Location
Sensor Supply #1 Sensors on engine ECM J2 connector
Sensor Supply #2 Sensors on engine ECM J1 connector
Illustration 1 g06349990Recommended Actions
Table 3
Troubleshooting Test Steps Values Results
1. Check for Codes
A. Connect Cat® Electronic Technician (ET) to the service tool connector. Refer to Troubleshooting, "Electronic Service Tools", if necessary.
B. Turn the keyswitch to ON.
C. Determine if a code is present.
Codes
Result: A -3 or -4 code is present.
Proceed to Test Step 2.
Result: A -21 code is present.
Proceed to Test Step 3.
2. Check for a Failed Sensor
A. Connect to Cat ET.
B. Turn the keyswitch to ON.
C. Disconnect a sensor on the suspect sensor supply circuit.
D. Monitor Cat ET while the sensor is disconnected to see if the active code changes to logged.
E. Connect the suspect sensor to the wiring harness
F. Repeat steps C through E for each sensor on the suspect sensor supply.
Failed Sensor
Result: The suspect sensor supply active code changes to logged when a sensor is unplugged.
Repair: Replace the failed sensor.
Verify that the repair resolved the problem.
Result: The suspect sensor supply active code remains active after all sensors on the sensor supply circuit have been checked.
Repair: A failed wiring harness has been detected. Repair or replace the wiring harness.
Verify that the repair resolved the problem.
3. Check the Sensor Supply
A. Turn the keyswitch to OFF.
B. Unplug the suspect sensor from the wiring harness.
C. Place a jumper wire between pin 1 and pin 2 on the suspect sensor wiring harness connector.
D. Connect to Cat ET.
E. Turn the keyswitch to ON.
F. Monitor the codes using Cat ET.
Codes
Result: A -4 code is activated on the suspect sensor supply.
Repair: Remove the sensor. Check the sensor passage for a blockage or obstruction. Also, check for moisture frozen in the lines. If blockage is not found, replace the sensor.
Verify that the repair resolved the problem.
Result: A -4 code is not activated on the suspect sensor supply.
Repair: The problem is in the wiring from the ECM to the sensor connector. Repair the wiring or replace the wiring.
Verify that the repair resolved 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).