The throttle control is not operated with a mechanical wire. But it is a computer controlled system in which the engine ECM controls the engine speed, after getting the data from various sensors. The idle speed adjustment is carried out with special tools and equipment.
SOURCE: 01 s40 idle air control valve- hard to replace?
its sitting right up front right side easy to replace star scewdriver and vice grips or pliers to remove plastic cover and start work
SOURCE: need relay location
relay 1 engine compartment
fascia 2 relay 18 (if it is diesel) relay 10 (diesel again) and this could likely be the best candidate relay 4 fuel pump relay/glow plug relay
Now for the fuse box locations ... looking from the front of the car... the engine compartment fuse box is on the left side up near the firewall.
fascia two is the lowest of the two fuse panels on the drivers side under the dash to the right of the steering column (left if it was a right hand drive).
This took about 15 minutes to locate all the possible fuses, be that as it may if i missed it don't hesitate to ask me again.
Robert
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SOURCE: How does one change air filter in 2002 VW Passat 1.8T?
vw caper is correct. you will need to loosen the 2 philips screws on the air box then lift up the air box towards the fire wall. Be sure to refit the air box lid correctly.
SOURCE: 1999 VW Passat low idle
replace your fuel filter first. If that does not do it, then try an air-flow meter. (if the check engine light is on it may be an airflow meter.
SOURCE: Where is the temperature sending unit on a 1999 VW
VW Passat & Audi A4 1990-2000
Motronic System
The Engine Coolant Temperature (ECT) sensor is mounted in the water
outlet on the back side of the head. If you vehicle still has a
original VW part it will be black in color with a four terminal
connector. This device signals the engine management system with the
current coolant temperature, the ECU takes this information and uses it
to control other such circuits as the idle speed, knock control system,
oxygen sensor circuit, exhaust gas recalculation, and fuel tank
venting. It is also important to note that if at any time ECU does not
receive a signal from the ECT it will substitute a value of 176°F
(80°C).
VR6
The Engine Coolant Temperature sensor is mounted in the thermostat
housing. The body of the sensor will be blue and the sensor will be
blue and have
two terminals if it is an original factory VW part.
The engine coolant temperature gauge uses a heat sensitive sending
unit to transmit an electrical signal to the gauge. The sending unit is
a heat sensitive variable resistor that is located on or near to the
cylinder head and threads into an engine coolant passage. The sensors
are a Negative Temperature Coefficient (NTC) type. As the temperature
increases, the electrical resistance of the sensor decreases. As the
coolant temperature changes, so does the resistance of the sensor. The
gauge is calibrated within the operating range of the sensor and
interprets the resistance value to display the coolant temperature.On models produced prior to 1994, the engine coolant gauge temperature sensor is a single wire terminal sensor.
Beginning with model year 1994, the engine coolant gauge and the Engine
Control Module (ECM) temperature sensors were combined into one sensor
with 4 terminals. The basic operation remains the same in that their
resistance decreases as the coolant temperature increases, however the
actual resistance values of the 2 sensor circuits are different. The
electrical connector of the 4-wire terminal sensor (1
and
2) is keyed to prevent improper connection of the sensor's electrical circuit.
WARNING
When trouble shooting electrical components, always consult a
wiring diagram for the particular year, make and model to ensure proper
test equipment connection and diagnosis. Failure to use suitable test
equipment and testing methods could permanently damage the electrical
component(s).
Fig. Beginning with model year 1994, the Engine Coolant
Temperature Sensors combined the sensors for the ECM and the gauge into
one sensor-1997 2.8L V6 sensor shown
Fig. The electrical connector for the combined temperature
sensors is keyed to avoid improperly connecting the sensor's
wiring-1997 2.8L V6 connector shown
I hope help you with this, good luck (remember rated this help).
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