Fiat Bravo Service Manual page 446

Engine
Fuel system
i—°
e —
p/wv-m
NOTE Whenever the potentiometer bolts are loosened or removed, they must be replaced because the
threads are covered by a light layer of loctite. This secures the bolt once only.
NOTE On post-modification cars, the throttle valve position sensor is built into the throttle body.
34
Wiring connectors
The numbers in squares indicate the corre-
sponding control unit pins.
Pin A - Earth
Pin B - Positive
Pin C - Signal
Checking the resistance
Sensor resistance may be measured as fol-
lows:
- connect an ohmmeter across sensor pins A
- check an ohmmeter between sensor pins A
Recovery
The system assumes a value calculated on the
basis of rpm and pressure in the inlet mani-
fold. If the pressure sensor fails at the same
time, a throttle opening of about 50° is as-
sumed as a fixed value.
Strategies to gradually decrease rpm at idle
speed (dashpot) are blocked.
Idle speedself-adaption is blocked.
Mixture
blocked.
Removing-refitting
Procedure for premodification cars
Disconnect the electrical connection, undo the
two fixing bolts and remove the sensor.
NOTE
4A34IJ03
' f t ^ S i i f i i ^ . ^ A i ^ / i i V u / v i t i s ' i r A
Bravo-Brava
and B and check a fixed resistance of 1200
ohms;
and C and check that resistance varies from
0 to 1200 ohm ± 20% when the throttle is
moved.
concentration
The sensor is secured to the throttle
body by two tabs with two
slotted holes. Sensor angular position
does not require adjustment because
the control unit recognises throttle
closed or fully open positions
means of special self-adaptive algo-
rithms.
1998 range
self-adaption is
non-
by
Publication n° 506.670/21