Scan Tool Operating Instructions - AK Automotive Training

Manufacturer Applications
5 1. Engine speed (actual - max. 2250 rpm).
2. Engine speed (see note below).
3. Air mass idling speed controller.
4. Switch positions.
NOTE: Specified. The basic 760 rpm speed specified is reduced to 600 rpm when a
Drive position is engaged in an automatic gearbox, to prevent vehicle-creep. This
reduction is partially cancelled if the rear screen heater or air conditioner is operating
and idling speed is raised to 700 rpm. If no Drive position is engaged, the idling speed
is raised to 800 rpm as a result of the air conditioner demanding a high cooling or
heating capacity. Refer to Table 24 for the specified idling speed for the loading applied.
6 1. Engine speed (actual - max. 2250 rpm).
2. Air mass idle speed controller (see Note 1 below).
3. Learning value of idling speed stabilisation (see Note 2 below).
4. Switch position.
NOTE 1: Learning process occurs in small steps each time the idling speed switch
closes - blip the throttle approx. once every 10 seconds to open and close the switch.
NOTE 2: Indicates the drift away from the designed average value (a new engine
should have a positive value).
7 1. Air mass inducted - specified air mass calculated by the control unit -
engine idling.
2. Air mass inducted - actual measured air mass - engine idling. Deviations
of up to 0.3 g/s that last only a short time may be ignored.
3. Current control factor - of idling speed stabilisation valve. Values above
1.2 indicate a contact resistance between the control unit and the idling
speed stabilisation valve. Values which greatly differ indicate fouling or
jamming of the idling speed.
4. Learning value of idling speed stabilisation.
8 1. Engine speed (displayed in steps of 40 rpm).
2. Engine load (see Note 1 below).
3. Fuel consumption (see Note 2 below).
4. Vehicle speed.
NOTE 1: Read-outs of 80 to 100% are reached when driving at full throttle. Note that
the maximum engine load decreases by approximately 10% for each 1000 m above
sea level.
NOTE 2: Read-out applies to engine idling without ancillary loads (i.e. auto gearbox,
aircon/heating system, alternator, power steering pump).
9 1. Engine speed.
2. Engine specified torque
3. Engine actual torque.
4. Ignition angle retardation - retardation occurs to smooth the gearshift jolt
by reducing the torque output. No ignition angle retardation occurs
below 2000 rpm.
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