Diagnostic procedures for a VAG diagnostics
Database for coding vehicle control units Volkswagen - VAG
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Engines / Petrol / Magneti Marelli 4HV general / Test - Lambda-sensor upstream of catalyst - lambda control; voltage
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Diagnostic operation
Diagnostic procedure
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Conditions:
- exhaust system - tightness of line - OK
- engine speed = idling
- engine temperature > XX °C
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)
if values are not achieved increase rpm to XXXX rpm
upon achievement of values - continue
XX - Measured values group XXX
required values
field X = -XX% - +XX% (learning value - lambda control - cylinder row X - idling)
field X = -XX% - +XX% (learning value - lambda control - cylinder row X - partial load)
if values are not achieved - field X - check component: exhaust system - tightness of line
if values are not achieved - field X - check component:
- fuel pressure
- injector
- exhaust system - tightness of line
- heating of lambda probe(s)
- Lambda sensor(s) - contamination
- intake air pressure sensor
Conditions:
- air-conditioning = ON
- low beam = ON
XX - Basic settings group XXX
activate default settings
fully depress: brake pedal + accelerator pedal
required values:
field X = BX-SX OK
upon achievement of values: release brake pedal + accelerator pedal
- engine speed = idling
wait XX s
XX - Measured values group XXX
required values
field X = -XX% - +XX% (lambda control - fluctuates)
field X = X.XV - X.XV (voltage of lambda probe(s) - fluctuates)
if values are not achieved - < required values - rich mixture - check component:
- injector - (tightness)
- fuel pressure - (high?)
- spark-plugs
- heating of lambda probe(s)
- Lambda sensor(s)
- line
if values are not achieved - > required values - poor mixture - check component:
- intake system - tightness
- fuel pressure - (low?)
- injector - (clogged?)
- exhaust system - (tightness)
- heating of lambda probe(s)
- Lambda sensor(s)
- line
if values are not achieved - field X,X - not fluctuates - check component:
- intake system - tightness
- injector - (tightness, clogged?)
- spark-plugs
- exhaust system - (tightness)
- heating of lambda probe(s)
- Lambda sensor(s)
- line
- exhaust system - tightness of line - OK
- engine speed = idling
- engine temperature > XX °C
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)
if values are not achieved increase rpm to XXXX rpm
upon achievement of values - continue
XX - Measured values group XXX
required values
field X = -XX% - +XX% (learning value - lambda control - cylinder row X - idling)
field X = -XX% - +XX% (learning value - lambda control - cylinder row X - partial load)
if values are not achieved - field X - check component: exhaust system - tightness of line
if values are not achieved - field X - check component:
- fuel pressure
- injector
- exhaust system - tightness of line
- heating of lambda probe(s)
- Lambda sensor(s) - contamination
- intake air pressure sensor
Conditions:
- air-conditioning = ON
- low beam = ON
XX - Basic settings group XXX
activate default settings
fully depress: brake pedal + accelerator pedal
required values:
field X = BX-SX OK
upon achievement of values: release brake pedal + accelerator pedal
- engine speed = idling
wait XX s
XX - Measured values group XXX
required values
field X = -XX% - +XX% (lambda control - fluctuates)
field X = X.XV - X.XV (voltage of lambda probe(s) - fluctuates)
if values are not achieved - < required values - rich mixture - check component:
- injector - (tightness)
- fuel pressure - (high?)
- spark-plugs
- heating of lambda probe(s)
- Lambda sensor(s)
- line
if values are not achieved - > required values - poor mixture - check component:
- intake system - tightness
- fuel pressure - (low?)
- injector - (clogged?)
- exhaust system - (tightness)
- heating of lambda probe(s)
- Lambda sensor(s)
- line
if values are not achieved - field X,X - not fluctuates - check component:
- intake system - tightness
- injector - (tightness, clogged?)
- spark-plugs
- exhaust system - (tightness)
- heating of lambda probe(s)
- Lambda sensor(s)
- line
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.