ELBOW 8T3491 - Caterpillar

Table 1
J1939 Code and Description Comments
3509-2
Sensor Supply Voltage 1 : Erratic, Intermittent, or Incorrect The Electronic Control Module (ECM) detects a fault in the 5 VDC sensor supply circuit supplied on the following pins:
J1:68 Transmission Oil Pressure Sensor
J2:07 Intake Manifold Air Pressure/Temperature Sensor
J2:31 Oil Pressure/Temperature Sensor
J2:13 Crankcase Oil Pressure Sensor
J2:32 Crankcase Pressure Sensor
3509-12
Sensor Supply Voltage 1: Failure The ECM has detected an internal fault with the sensor supply. Replace the Engine ECM.
3510-2
Sensor Supply Voltage 2 : Erratic, Intermittent, or Incorrect The Electronic Control Module (ECM) detects a fault in the 5 VDC sensor supply circuit supplied on the following pins:
J1:66 Analog Throttle Sensor
J2:08 Low-Pressure Fuel Sensor
J2:10 Sea Water Pressure Sensor
J2:33 Supercharger Speed Sensor
3511-2
Sensor Supply Voltage 3 : Erratic, Intermittent, or Incorrect The Electronic Control Module (ECM) detects a fault in the 5 VDC sensor supply circuit supplied on the following pin:
J2:11 Rail Pressure Sensor
J2:34 Air Filter Pressure/Temperature Sensor The ECM provides three internally distributed 5 VDC supply circuits to the various engine pressure sensors, temperature sensors, and the analog throttle sensor power supply. If there is an active or logged diagnostic code against a specific sensor, it may be an indication of which sensor or wiring circuit is creating a high or low voltage condition detected by the Engine ECM as there are multiple sensors on each of the 3 shared supply paths.
Table 2
Troubleshooting Test Steps Values Results
1. Check for Codes
A. Connect the electronic service tool to the service tool connector. Refer to Troubleshooting, Electronic Service Tools, if necessary.
B. Turn the keyswitch to the ON position.
C. Check to if see of one of the diagnostic codes listed above is active or logged.
Codes
Result: A -2 diagnostic code is active.
Note which 5 V supply is reporting the active sensor supply code.
Proceed to Test Step 2.
Result: A -2 diagnostic code is logged.
Note: An intermittent fault may be present. Refer to Troubleshooting, Electrical Connectors - Inspect, to identify intermittent faults.
2. Check for a Failed Sensor
A. Connect to the electronic service tool.
B. Turn the keyswitch to the ON position.
C. Disconnect a sensor on the suspect sensor supply circuit.
D. Monitor the electronic service tool 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.
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: The fault is in the wiring harness.
Check all wiring on the suspect sensor supply. Refer to the appropriate Electrical Schematic.
Replace the faulty wiring.
If the procedure did not correct the fault, have your Technical Communicator (TC) contact the Dealer Solution Network (DSN).