Engines / Diesel / 1.9/74kW TDI-PD BMT / Test of exhaust gases temperature sensor (G235; G495; 648)

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Mark	Model	Control unit	Diagnostic operation

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Select a vehicle make or a common group such as Service Intervals, Engines, Transmissions, Immobilizers and Independent Heaters.

Model

Control unit Select the desired control unit as accurately as possible. The UDS identifier EV_xyz can be found in the VCDS after connecting to the control unit and then in the Extended Identification.

Select the desired control unit as accurately as possible. The UDS identifier EV_xyz can be found in the VCDS after connecting to the control unit and then in the Extended Identification.

Diagnostic operation Select the desired diagnostic procedure.

Diagnostic procedure

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Conditions:
- engine speed = idling
- engine temperature > XX°C

connect with the control unit XX - engine

XX - Measured values group XXX
observe values:
field X = actual value (temperature upstream of component: turbo blower)
field X = actual value (temperature upstream of component: Diesel Particulate Filter)
field X = actual value (temperature downstream of component: Diesel Particulate Filter)
increase rpm to XXXX rpm
desired condition:

field X = increasing - strongly
field X, field X = increasing - moderately

field X > field X > field X

for this test, it is suitable to use graphical representation VagScope

Picture documentation:

+ G235-def.JPG

+ G235 - OK.JPG

if values are not achieved - check component:
- temperature sensor
- wiring
- connector connections

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