Specifications

18
Testing Testing Engine Systems
Important Tips for Using Special Functions
•
On most 1990–95 vehicles, adaptations reset automatically when the battery is discharged or
disconnected, but a scan tool must be used on most 1996 and newer vehicles.
• Resetting adaptations does not clear stored trouble codes, which is a separate function.
• Individual resets available may vary by year, model, and engine management system. Some
systems may have only one selection, “Reset All Adaptations.”
NOTE:
i Resetting throttle adaptation may cause loss of throttle response and poor run condition on some
models. To relearn throttle adaptation, turn the ignition on (do not start engine) for 30 seconds,
then turn ignition off for 10 seconds. Now start the engine and throttle control should be OK.
NOTE:
i After performing a reset, be sure to cycle the ignition key or the engine may not start.
4.1.4 Service Reset
This selection is used to reset the service lamps on the instrument cluster. The Service Indicator
System (SIA) is designed to alert the driver when the vehicle is due for a service. The BMW
Maintenance System includes the Engine Oil Service and Inspections I (minor service) and II
(major service). Different years and models have display variations depending on the instrument
cluster level type.
NOTE:
i Note the following regarding SIA systems:
• Oil changes are always done during an inspection.
• Service resets always alternate between Oil (first) and Inspection (second).
• It is not recommended to reset either Oil or Inspection services early. If oil is changed more
frequently, keep a separate record.
• After performing a reset, make sure to cycle the ignition key or the engine may not start.
There are three different SIA types:
• SIA II
• SIA III
• SIA IV
SIA II
The SIA II is found on all 1986–96 models except the E36, which continued using it up through
1999. With this type, optimal maintenance intervals are calculated using actual operating
conditions (not limited to mileage accumulation only). Other inputs in determining the optimal oil
change and service interval may include coolant temperature, engine speed, vehicle speeds,
number of short and long trips, number of engine starts, etc.
The lower level lamp display contains seven lamps (Figure 4-1):