Scan Tool Operating Instructions - AK Automotive Training

32Lambda
Learnt Values
Manufacturer Applications
1. Lambda learnt value at idling speed (additive) (see note below).
2. Lambda learnt value at part load (multiplicative) (see note below).
3. Not allocated
4. Not allocated
NOTE: A low value indicates that the engine is running too rich and therefore the ECU
is weakening the mixture.
A high value indicates that the engine is running too weak and therefore the ECU is
enriching the mixture.
Additive: The effects of a fault (e.g. Intake air leak), will reduce as the engine speed
increases, so the injection period will be modified by a fixed amount. This amount is not
dependent on the basic injection duration period.
Multiplicative: The effects of a fault (e.g. Injector fault) will increase as engine speed
increases, so a multiplicative learnt value is a proportional change to the injection
duration. The change is dependent on the basic injection duration period.
33 Lambda
Regulation
34 Lambda
Regulation
1. Pre-catalyst lambda regulation.
2. Pre-catalyst oxygen sensor voltage.
3. Not allocated
4. Not allocated
1. Engine speed.
2. Catalyst temperature (see Note 1 below).
3. Dynamic factor (see Note 2 below).
4. Result of pre-catalyst oxygen sensor age test (see Note 2 below)
NOTE 1: Calculated value from engine speed and load.
NOTE 2: The dynamic factor is an Oxygen sensor ageing measurement. The ECU
compares the adjustment frequency of the sensors' evaluation circuitry with a stored
specification. If the value is not reached, the text 'B1-P1 n/OK' is displayed in zone 4.
41 Lambda
Regulation
43
Post-catalyst
Oxygen
Sensor
46 Catalyst
Diagnosis
50 Idle Speed
Regulation
1. Pre-catalyst oxygen sensor internal resistance.
2. Pre-catalyst oxygen sensor heating status.
3. Post-catalyst oxygen sensor internal resistance.
4. Post-catalyst oxygen sensor heating status.
1. Engine speed.
2. Catalyst temperature.
3. Oxygen sensor voltage.
4. Result of oxygen sensor test.
1. Engine speed.
2. Catalyst temperature.
3. Catalyst conversion measured value.
4. Result of catalyst conversion test.
1. Actual engine speed.
2. Specified engine speed.
3. A/C operating condition.
4. A/C compressor operating condition.
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