Exhaust Pressure Sensor 1 -G450-, Checking

General Description 

Exhaust gas temperature sensors are positive temperature coefficient (PTC) sensors. They measure the temperature of the exhaust gas. The Engine Control Module -J623- uses the signals from exhaust gas temperature sensors to calculate the amount of contamination in the diesel particulate filter, also to protect the turbocharger from unacceptably high exhaust gas temperatures. The diesel particulate filter contamination status is calculated using the se signals from the exhaust gas temperature sensors, together r with the signals from; Exhaust Pressure Sensor 1 -G450-, Differential Pressure Sensor -G505-, Exhaust Pressure Sensor 2 -G451-, Mass Airflow Sensor -G70-, and Heated Oxygen Sensors --. The signal also serves as component protection in order to protect the diesel particulate filter and turbocharger from excessively high exhaust gas temperatures.

Special Tools And Workshop Equipment Required 

• Multimeter.
• Wiring Diagram.
• Scan Tool.

Test Requirements 

• Fuses OK.
• Battery voltage OK.
• Switch OFF all electrical and electronic accessories.
• Vehicles with Auto. Transmission, ensure Selector Lever position is in "P.".
• Vehicles with Man. Transmission, ensure Shifter Lever position is in "N" with Parking Brake applied.
• Coolant Temperature: ≥ 80 °C.
• Observe all safety precautions, refer to SAFETY PRECAUTIONS .
• View clean working conditions, refer to CLEAN WORKING CONDITIONS .
• For Hybrid vehicles refer to: HIGH VOLTAGE SYSTEM GENERAL WARNINGS .

Test Procedure