Vehicles after change point in 1982
CHECKING ADAPTIVE PILOT CONTROL (9.84 ... 9.85)
Testing Requirements:
Engine, oxygen sensor and catalytic converter
have operating temperature.
Oxygen sensor is heated electrically.
Unscrew screws (1).
Mount exhaust tester 13 0 090 on exhaust
manifold with adapter 13 0 100.
Connect BMW service test unit.

Remove anti-tamper lock.
Remove air cleaner with air flow sensor.
Drill holw in anti-tamper lock with Special Tool
13 1 092.

Screw Special Tool 13 1 094 in anti-tamper
lock.
Knock special tool with anti-tamper lock out
of air flow sensor with impact (1).
Install air cleaner with air flow sensor.
Run engine at idle speed.

Pull off and plug vacuum hose on fuel pressure
regulator.
Oxygen sensor must regulate the CO level back
to nominal value* after a brief rise.
Oxygen sensor is okay.


* See Nominal Value Microfiche

Tighten air control screw in air flow sensor
completely with Special Tool 13 1 100 -
richer mixture.
Run engine at idle speed - CO level will be
regulated back to nominal value*.


* See nominal value microfiche

Disconnect oxygen sensor plug.
CO level rises to approx. 2.0 % by volume.
Note instantaneous actual value.
Stop engine.
Disconnect battery ground lead briefly.
This will cancel the value stored in memory of
DME control unit.

Start engine.
If actual CO level value is considerably higher,
adaptive pilot control is working.
Connect vacuum hose again.
Adjust CO level to nominal value* with Special
Tool 13 1 100.
Connect oxygen sensor.
Remove exhaust tester.


* See nominal value microfiche

Remove and install air cleaner with air flow
sensor.
Insert new anti-tamper lock (1) in air flow
sensor.