Engines / Petrol / MED 9.5.10 CAN general / Test - lambda control - Lambda-sensor downstream of catalyst


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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 = XXx (Lambda-sensor downstream of catalyst - status)

?xx = heating of lambda probe(s)
x?x = readiness for operation
xx? = lambda control

if values are not achieved - increase rpm to XXXX - XXXX rpm

wait

required values
field X = XXx (Lambda-sensor downstream of catalyst - status)


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

You are not logged! System works in DEMO mode only now where numbers are replaced with X characters. For 49 EUR only You will get access into full system. You can pay by credit card or bank transfer. Click BUY button for purchase and  You will get login to diagnostic procedures database imediatelly.

Volkswagen workshop manuals for diagnostics

Log-in Buy