Porsche 928 GTS 1994, Owner'S Manual

Page: 41 / 127

out after starting the engine, there is a malfunc-
tion in the electrical system. If this is the case,
contact your Porsche dealer. If the light flickers
or stays on while you are driving, the V-belt may
be loose or broken. The belt should be reten-
sioned or replaced. The fault may also be in the
regulator or the alternator itself. In this case,
keep electrical consumption at a minimum and
drive to the nearest workshop.
Coolant temperature gauge
and warning light
Needle in left field - engine is cold
As long as needle is in left field, avoid high
speeds and high engine rpm, until engine
has reached normal operating temperature.
Do not lug the engine.
Needle in center field - normal
Under normal driving conditions, needle should
remain in center field. The needle may reach the
right field, especially at high engine loads, but
should return to "normal" when engine load is
reduced.
Needle in right field - engine is warm
If needle enters the red mark, the engine is
overheating. The warning light comes on and
fault message appears in the information system
display. Reduce speed and engine rpm. If it
does not cause the temperature to decrease,
pull off the road, turn off the engine and let it
cool down.
Coolant temperature warning light
If the warning light comes on, check that the
fans are working. See section "Cooling fan con-
trol. If the fans are not rotating, the power
supply to the fan control is defective.
If the problem cannot be readily located, be
sure the engine has cooled down sufficiently.
Then drive to the nearest Porsche dealer, but
carefully watch the coolant temperature gauge
and the warning light. Try to avoid engine idling,
very low speeds and engine speeds in excess of
4000 rpm.
For other details refer to "Cooling System".
Warning lights/Indicator lights
Emission Control System
Malfunction Indicator Light
Vehicles having this indicator light are equipped
with a special on-board diagnostic system. This
system monitors the various components of the
Emission Control System.
The light comes on when the ignition is switched
on. It will go out after the engine is started, if
you have started without depressing the acceler-
ator pedal. This is to assure you that the mal-
function indicator light is functioning properly.
If the light does not go out after starting the
engine, or if it should come on always while driv-
ing, this indicates that there is a malfunction in
the Emission Control System. Have the cause
corrected promptly by an authorized Porsche
dealer or a qualified workshop.
Each monitored component in the Emission Con-
trol System has been coded. In case of a mal-
function the respective component will be iden-
tified and the fault stored in the control unit's
memory.
The stored data can be displayed by a flashing
code of the malfunction indicator light to assure
an accurate diagnosis. For further information of
the codes and repair procedures, see your
authorized Porsche dealer.
41