CONNECTOR 2681506 - Caterpillar

Use this procedure to troubleshoot the electrical system if a problem is suspected with a sensor supply. Also, use this procedure if one of the following diagnostic codes is active or easily repeated.
Table 1
Diagnostic Codes Table
J1939 Code and Description Conditions which Generate this Code System Response
678-3
ECU 8 Volts DC Supply : Voltage Above Normal The digital sensor supply voltage is above normal for two seconds. The code is logged.
All sensors are set to default values.
678-4
ECU 8 Volts DC Supply : Voltage Below Normal The digital sensor supply voltage is below normal for two seconds.
1180-3
Engine Turbocharger 1 Turbine Inlet Temperature : Voltage Above Normal The digital sensor supply voltage is above normal for two seconds. The code is logged.
All sensors are set to default values.
1180-4
Engine Turbocharger 1 Turbine Inlet Temperature : Voltage Below Normal The digital sensor supply voltage is below normal for two seconds.
1181-3
Engine Turbocharger 2 Turbine Inlet Temperature : Voltage Above Normal The digital sensor supply voltage is above normal for two seconds. The code is logged.
All sensors are set to default values.
1181-4
Engine Turbocharger 2 Turbine Inlet Temperature : Voltage Below Normal The digital sensor supply voltage is below normal for two seconds.
3509-3
Sensor Supply Voltage 1 : Voltage Above Normal The analog sensor supply voltage is above normal for two seconds. The code is logged.
All sensors are set to default values.
3509-4
Sensor Supply Voltage 1 : Voltage Below Normal The analog sensor supply voltage is below normal for two seconds.
3510-3
Sensor Supply Voltage 2 : Voltage Above Normal The analog sensor supply voltage is above normal for two seconds. The code is logged.
All sensors are set to default values.
3510-4
Sensor Supply Voltage 2 : Voltage Below Normal The analog sensor supply voltage is below normal for two seconds.
108-21
Atmospheric Pressure Sensor : Data Drifted Low The 5 VDC supply to the sensor has been lost. The code is logged.
All sensors are set to default values.
3563-21
Engine Intake Manifold #1 Absolute Pressure : Data Drifted Low The 5 VDC supply to the sensor has been lost. The code is logged.
All sensors are set to default values.
5578-21
Engine Fuel Delivery Absolute Pressure : Data Drifted Low The 5 VDC supply to the sensor has been lost. The code is logged.
All sensors are set to default values.
5580-21
Engine Fuel Delivery Absolute Pressure : Data Drifted Low The 5 VDC supply to the sensor has been lost. The code is logged.
All sensors are set to default values. System Operation The Electronic Control Module (ECM) supplies a regulated voltage of 5.0 0.2 VDC to the following sensors:
Atmospheric pressure sensor
Crankcase pressure sensor
Filtered engine oil pressure sensor
Filtered fuel pressure sensor
Left turbocharger inlet pressure sensor
Right turbocharger inlet pressure sensor
Unfiltered engine oil pressure sensor
Unfiltered fuel pressure sensor
Turbocharger outlet pressure sensorThe ECM supplies a regulated voltage of 8.0 0.4 VDC to the following sensors:
Left turbocharger turbine inlet temperature sensor
Right turbocharger turbine inlet temperature sensorThe supply voltage for the sensors is routed from the