Diagnostic procedures for a VAG diagnostics
Database for coding vehicle control units Volkswagen - VAG
Software versions
VIN - Code validator
Engines / Petrol / MED 17.5 CAN 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 temperature > XX °C
- catalyst temperature >= XXX °C (XX - Measured values group XXX field X)
Note:
- observe the occupation safety rules when taking a test drive with connected diagnostics tester
- second mechanic necessary
Start the engine
wait X minutes
do a test drive - engine speed XXXX rpm
connect with the control unit XX - engine
XX - Measured values group XXX
required values field X (Lambda-sensor upstream of catalyst X):
xxxxX = lambda control = active
xxxXx = lambda control = readiness for operation
xx?xx = heating of lambda probe(s)
XX - Measured values group XXX
required values:
field X = -XX% - +XX% (cylinder row X - lambda control value - fluctuates)
field X = X.XV - X.X V (cylinder row X - voltage - 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)
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)
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)
- exhaust system - tightness of line - OK
- engine temperature > XX °C
- catalyst temperature >= XXX °C (XX - Measured values group XXX field X)
Note:
- observe the occupation safety rules when taking a test drive with connected diagnostics tester
- second mechanic necessary
Start the engine
wait X minutes
do a test drive - engine speed XXXX rpm
connect with the control unit XX - engine
XX - Measured values group XXX
required values field X (Lambda-sensor upstream of catalyst X):
xxxxX = lambda control = active
xxxXx = lambda control = readiness for operation
xx?xx = heating of lambda probe(s)
XX - Measured values group XXX
required values:
field X = -XX% - +XX% (cylinder row X - lambda control value - fluctuates)
field X = X.XV - X.X V (cylinder row X - voltage - 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)
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)
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)
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.