Porsche 1989 944 S2, Workshop Manual

Page: 167 / 167

944 S/944 S2 Fuel System - Electronic Control
24/28
Check-Engine Lamp
(Malfunction Indicator Light M.I.L)
As from model year '91, Califomian legislation prescribes a waming lamp which lights up if a
part relevant to the exhaust gas fails.
As a function check of the warning lamp, it lights up when the ignition is switched on and goes
out once the engine is running when this is started without depressing the accelerator.
The waming lamp has a flashing code to indicate a defective fault path.
To trigger off the flashing code, fully depress the accelerator pedal with the engine off and the
ignition on for 3 seconds until the Malfunction Indicator Lamp flashes. Then remove foot from
accelerator.
If no fault is recorded, i.e. no warning came from the indicator light, there appears the flashing
code
1500
no fault.
= Lamp on o = Lamp off
If the waming light did indicate a warning, i.e. there is a fault, there appears a flashing code,
e.g.
1124
Oxygen sensor
The flashing code is listed in the Diagnosing/Troubleshooting plan on page D 24/28-7.
The fault can also be read direct using System Tester 9288. After a repair the fault memory
must be erased using the System Tester.
DME - Diagnosing/Troubleshooting
Printed In Germany - XXII, 1990
D 24/28 - 33