Scan Tool Operating Instructions - AK Automotive Training

Manufacturer Applications
2 1. Engine speed.
2. Engine load.
3. Average injection duration.
4. Intake air mass.
4 Intake Air
Temperature
at idle speed
5 Vehicle
Speed
30 Oxygen
Sensor
32 Lambda
Learnt Values
1. Engine speed.
2. Battery voltage.
3. Engine coolant temperature.
4. Intake air temperature.
1. Engine speed.
2. Engine load.
3. Vehicle speed.
4. Engine operating status (part load, idle, etc.).
1. Oxygen sensor status - bank 1.
2.
3. Oxygen sensor status - bank 2.
4. Not allocated.
1. Lambda learnt value at idle speed - bank 1 (additive) (see note
below).
2. Lambda learnt value at part throttle - bank 1 (multiplicative) (see
note below).
3. Lambda learnt value at idle speed - bank 2 (additive) (see note
below).
4. Lambda learnt value at part throttle - bank 2 (multiplicative) (see
note below).
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 at
idle speed
50 Signals to
Engine ECM
1. Lambda control - bank 1.
2. Oxygen sensor voltage - bank 1.
3. Lambda control - bank 2.
4. Oxygen sensor voltage - bank 2.
1. Engine speed.
2. Specified engine speed.
3. A/C status.
4. A/C compressor status.
184