Scan Tool Operating Instructions - AK Automotive Training

Manufacturer Applications
3 1. Engine speed.
2. ECU supply voltage.
3. Engine coolant temperature.
4. Intake air temperature.
4 1. Throttle valve angle.
2. Idling air mass learnt valve (automatic transmission in P or N).
3. Idling air mass learnt valve (manual transmission in neutral or
automatic in drive).
4. Operating mode (idle, part load, etc.).
5 Idling
Stabilisation
6 Idling
Stabilisation
7 Lambda
Leant Values
8 Lambda
Leant Values
1. Actual engine speed.
2. Specified engine speed.
3. Idle air mass regulating valve.
4. Intake air mass.
1. Engine speed.
2. Idle air mass regulating valve.
3. Lambda regulator.
4. Ignition angle.
1. Lambda regulator control value.
2. Oxygen sensor voltage.
3. EVAP canister purge valve duty cycle.
4. Lambda correction factor whilst tank venting is active.
1. Injection duration.
2. Lambda learnt value at idle (additive) (see note below).
3. Lambda learnt value at part load (multiplicative) (see note below).
4. Fuel tank venting operating mode.
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.
9 Lambda
Leant Values
10 Fuel Tank
Venting
1. Engine speed.
2. Lambda regulator control value.
3. Oxygen sensor voltage.
4. Lambda learnt value at idle (additive).
1. EVAP canister purge valve duty cycle.
2. Lambda correction factor during active fuel tank venting.
3. Charge level of EVAP canister (see Note 1 below).
4. Fuel tank venting system purge rate (see Note 2 below).
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