Scan Tool Operating Instructions - AK Automotive Training

Manufacturer Applications
Table 15 - Lambda programming demand display (and diagnosis on
vehicles 06/94 on)
Relevant when '1' is displayed in the 8 digit block
X X X X X X X X Display Groups 7 & 8
0 Part load 3 (cylinders 4 to 6)
1 Part load 3 (cylinders 1 to 3)
0 Part load 2 (cylinders 4 to 6)
1 Part load 2 (cylinders 1 to 3)
1 Part load 1 (cylinders 4 to 6)
1 Part load 1(cylinders 1 to 3)
1 Idling speed (cylinders 4 to 6)
0 Idling speed (cylinders 1 to 3)
NOTE: Read-out 0 = request for renewed learning.
Read-out 1 = learning process ended for the time being.
NOTE: On models 06/94 onwards, the Display Groups 7 and 8 may be structured
differently to that for earlier models. Models up to 05/94 may indicate a Lambda
learning value in line 2, followed by the range display (Table 14) as line 3 and the
demand display as line 4: models from 06/94 have the programming range display
(Table 14) as line 2, a programming demand diagnosis as line 3 followed by demand
display as line 4.
Demand diagnosis illustrates which programmed value was checked. If diagnosis has
been performed the corresponding read-out is set to 1 regardless of whether or not
the diagnosis was recognised as being OK or not, e.g. if a value of the Lambda
programming diagnosis in display line 3 is set to 1, but the corresponding value of the
Lambda programming demand display in display line 4 is not set to 1, this indicates
that diagnosis was performed but was not recognised as being satisfactory.
The Lambda programming diagnosis will reset to 0 each time the engine is started at
a coolant temperature of less than 40°C.
Demand display illustrates which portion of the engine's operating range the
programming demand is required in. The format for demand diagnosis and demand
display is the same.
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