Engines / Petrol / MED 7.1.1 CAN general / Test - lambda control - Lambda-sensor downstream of catalyst

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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:
- exhaust system - tightness of line = OK
- appliances = OFF
- engine speed = idling
- engine temperature > XX °C
- catalyst temperature > XXX °C

connect with the control unit XX - engine

XX - Measured values group XXX

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

if values are not achieved increase rpm to XXXX rpm

wait
required values field X (Lambda-sensor downstream of catalyst):
xxxxX = lambda control = active
xxxXx = lambda control = readiness for operation
xx?xx = heating of lambda probe(s)

XX - Basic settings group XXX
activate default settings

depress and hold - brake pedal + accelerator pedal

required values
field X = XXXX rpm
field X > XXX °C
field X = Test. ON

wait

required values
field X = BX-SX - OK

release - brake pedal + accelerator pedal

upon non--achievement of condition - continue

switch-off the ignition

wait XX s

Start the engine

XX - Basic settings group XXX
activate default settings

depress and hold - brake pedal + accelerator pedal

observe values X minutes

field X = X V - X V (fluctuates)
(for this test, it is suitable to use graphical representation)

release - brake pedal + accelerator pedal

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,X V - check component:
- Lambda-sensor downstream of catalyst - line - short-circuit to GND
- Lambda-sensor downstream of catalyst - short-circuit to GND

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