Engines / Petrol / ME 7.5 general / Test - Lambda-sensor downstream of catalyst

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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:
- exhaust system - tightness of line - OK
- engine temperature > XX °C
- catalyst temperature > XXX °C (XX - Measured values group XXX field X)

Start the engine

wait XXX s

connect with the control unit XX - engine

XX - Measured values group XXX
required values field X (Lambda-sensor upstream of catalyst):
xxxxX = lambda control = active
xxxXx = lambda control = readiness for operation
xx?xx = heating of lambda probe(s)

increase rpm to XXXX rpm

XX - Measured values group XXX
required values
field X = XXXX rpm
field X > XXX °C

XX - Measured values group XXX
required values field X (Lambda-sensor downstream of catalyst):
Xxxx = lambda control = active
xxXx = lambda control = readiness for operation
x?xx = heating of lambda probe(s)

XX - Basic settings group XXX
activate default settings

sharply depress - brake pedal + accelerator pedal

the control unit increases the engine speed

required values
field X = TEST ON

wait

required values
field X = BX-SX OK

upon achievement of values

release brake pedal + accelerator pedal

XX - Basic settings group XXX
activate default settings

sharply depress - brake pedal + accelerator pedal

the control unit increases the engine speed

required values
field X = X,XX - X,X V
field X = TEST ON -> BX-SX OK

may take several minutes

XX - end of communication

switch-off the engine

if continuously displayed field X > X,X V - check component:
- Lambda-sensor downstream of catalyst - line - short-circuit to + XXV
- Lambda-sensor downstream of catalyst - short-circuit to + XXV

if continuously displayed field X < X,XX V - check component:
- Lambda-sensor downstream of catalyst - line - short-circuit to GND
- Lambda-sensor downstream of catalyst - short-circuit to GND

if continuously displayed field X = X,XX - X,X - check component:
- Lambda-sensor downstream of catalyst - line - shut-off
- Lambda-sensor downstream of catalyst - shut-off

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