Scan Tool Operating Instructions - AK Automotive Training

Manufacturer Applications
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
(code: ANB)
1. Pre-catalyst lambda regulator.
2. Pre-catalyst oxygen sensor voltage.
3. Not allocated
4. Not allocated
1. Engine speed.
2. Catalyst temperature (see Note 1 below).
3. Pre-catalyst oxygen sensor cycle duration.
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 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 line 4.
37 Lambda
Regulation
(code ANB)
41 Oxygen
sensor
heating
46 Catalyst
Diagnosis
(code ANB)
99 Lambda
Regulation
Operating
Conditions
50 Idle Speed
Regulation
1. Engine load.
2. Post-catalyst oxygen sensor voltage.
3. Pre-catalyst lambda regulation dwell period.
4. Test result.
1. Pre-catalyst oxygen sensor heater resistance.
2. Pre-catalyst oxygen sensor heater status.
3. Post-catalyst oxygen sensor heater resistance.
4. Post-catalyst oxygen sensor heater status.
1. Engine speed.
2. Catalyst temperature.
3. Amplitude ratio.
4. Test result.
1. Engine speed.
2. Engine coolant temperature.
3. Lambda regulator.
4. Operating mode.
1. Actual engine speed.
2. Specified engine speed.
3. A/C operating mode.
4. A/C compressor status.
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