POINT-CONTACT 8S3675 - Caterpillar

System Operation Description:Use this procedure to troubleshoot the electrical system if a problem is suspected with the circuit for one of the Pulse Width Modulated sensors (PWM sensors) or if one of the diagnostic codes in Table 1 is active or easily repeated.
Table 1
Diagnostic Codes Table
Description Conditions which Generate this Code System Response
3032-3 Turbocharger Compressor Outlet Temperature Sensor : Voltage Above Normal The duty cycle of the signal for the sensor has exceeded 98% for a duration of 120 ms. The code is logged.
The alarm output is activated.
3032-4 Turbocharger Compressor Outlet Temperature Sensor : Voltage Below Normal The duty cycle of the signal for the sensor has fallen below 2% for a duration of 120 ms.
3032-8 Turbocharger Compressor Outlet Temperature Sensor : Abnormal Frequency, Pulse Width, or Period The frequency of the signal for the sensor has exceeded 625 hz .
or
The frequency of the signal for the sensor has fallen below 375 hz .
3282-3 Turbocharger Compressor Outlet Pressure Sensor : Voltage Above Normal The duty cycle of the signal for the sensor has exceeded 98% for a duration of 120 ms. The code is logged.
The alarm output is activated.
The shutdown output is activated.
The engine is shut down.
3282-4 Turbocharger Compressor Outlet Pressure Sensor : Voltage Below Normal The duty cycle of the signal for the sensor has fallen below 2% for a duration of 120 ms.
3282-8 Turbocharger Compressor Outlet Pressure Sensor : Abnormal Frequency, Pulse Width, or Period The frequency of the signal for the sensor has exceeded 625 hz .
or
The frequency of the signal for the sensor has fallen below 375 hz .
106-3 Air Inlet Pressure Sensor : Voltage Above Normal The duty cycle of the signal for the sensor has exceeded 98% for a duration of 120 ms.
106-4 Air Inlet Pressure Sensor : Voltage Below Normal The duty cycle of the signal for the sensor has fallen below 2% for a duration of 120 ms.
106-8 Air Inlet Pressure Sensor : Abnormal Frequency, Pulse Width, or Period The frequency of the signal for the sensor has exceeded 625 hz .
or
The frequency of the signal for the sensor has fallen below 375 hz .
109-3 Engine Coolant Outlet Pressure Sensor : Voltage Above Normal The frequency of the signal for the sensor has fallen below 375 hz . The code is logged.
The alarm output is activated.
109-8 Engine Coolant Outlet Pressure Sensor : Abnormal Frequency, Pulse Width, or Period The frequency of the signal for the sensor has exceeded 625 hz .
or
The duty cycle of the signal for the sensor has exceeded 95% or fallen below 5% .
Illustration 1 g01423130
Components for the PWM sensors
(1) Analog pressure sensor
(2) Signal converter The PWM sensor circuit consists of an analog pressure sensor and a signal converter. The signal converter is powered by a 8.0 0.4 VDC regulated voltage from the ECM. The signal converter supplies 5.0 0.25 VDC to the analog sensor. The analog pressure sensor provides an analog signal to the signal converter that represents the pressure that is being sampled. The