300Tdi Discovery
19
FUEL SYSTEM
2
REPAIR
AIR FLOW SENSOR
Service repair no - 19.22.25
Remove
NOTE: The air flow sensor is not a
serviceable item. In event of failure or
damage the complete unit must be
replaced.
1. Disconnect battery negative lead.
2. Release intake hose clamp, disconnect from
sensor.
3. Disconnect multi-plug.
4. Release two clips securing air cleaner to air flow
sensor. Remove sensor from engine
compartment.
Refit
5. Reverse removal procedure. Ensure multi-plug is
firmly reconnected, and hose clamp at the rear
of sensor is securely tightened, to prevent
unmetered air entering engine.
THROTTLE POSITION SENSOR
Service repair no - 19.22.49
Remove
1. Disconnect battery negative lead.
2. Disconnect multi-plug from harness.
3. Remove two screws securing sensor to plenum
chamber and carefully pull sensor off throttle
shaft.
4. Remove old gasket.
Refit
5. Fit new gasket.
6. Align sensor and shaft flats, slide sensor on to
throttle shaft. Secure sensor to plenum chamber.
CAUTION: DO NOT operate throttle
mechanism while throttle position sensor
is loosely fitted, damage may be caused to
throttle position sensor wiper track.
