Component Description For Temperature Sensor Upstream Of Turbocharger - GF07.04-S-6031SA

ENGINES 642.8 in MODEL 906

with CODE (MG5) Engine OM 642 DE 30 LA, 140 kW (190 hp) 3800 RPM

except CODE (ZU7) National version for Canada

except CODE (ZU8) National version for USA

ENGINES 642.8 in MODEL 639

with CODE (XZ1) Model generation 1

with CODE (MZ0) Blue EFFICIENCY

View of engine from rear

Fig 1: Temperature Sensor Upstream Of Turbocharger Component Location (View Of Engine From Rear) - Engine 642

Courtesy of MERCEDES-BENZ USA

Location

The temperature sensor upstream the turbocharger is located at the exhaust inlet of the turbocharger.

Task

The temperature sensor upstream of turbocharger determines the exhaust gas temperature upstream of the turbocharger.

Design

The temperature sensor upstream of turbocharger consists of a metal housing with a positive temperature coefficient (PTC) resistor.

Function

The integral PTC resistor in temperature sensor upstream of turbocharger changes its electrical resistance according to the exhaust gas temperature. The respective change in resistance results in a voltage which is used by the CDI control unit (N3/30) to compute the exhaust temperature upstream of the turbocharger.

PTC means: The electrical resistance increases for an increasing temperature (PTC thermistor).