Throttle Position Sensor (Tps); Testing And Replacing - BMW 5251 Service Manual

130-1 2
Fuel
Injection
-
Disconnect intake air boot from throttle housing. Unbolt throt-
tle housing and lay aside. It is not necessary to disconnect
throttle cable or electrical harness connectors from throttle
housing.
-
Remove electrical harness connector from IAT sensor.
-
Unclip temperature sensor and remove from intake manifold.
-
Installation is reverse of removal. Use a new gasket at throttle
housing.
Throttle position sensor (TPS),
testing and replacing
4
The throttle position sensor (arrow) is located on top of the
throttle valve housing and provides the ECM with a voltage
value that represents throttle position (angle) and rate of
movement.
TheTPS is non-adjustable. If the throttle position sensor is re-
placed, the previous 'learned' TPS settings must be cleared
from the ECM using a BMW-compatible scan tool.
If the throttle position sensor signal is defective, afault code is
stored and the MILis illuminated when OBD II fault criteria are
exceeded. The ECM still operates the engine using the mass
air flow (MAF)
sensor and engine rpm inputs.
-
Check throttle position sensor function by disconnecting har-
ness connector and checking continuity across terminals. If
test results are incorrect, replace throttle position sensor. The
sensor is non-adjustable.
Throttle ~ o s i t i o n sensor testina values
-
Terminals
Test values
1
and ground in harness
5
vdc (approx.)
connector, ltey on
1
and
3
at sensor 4.0 itR(appr0x.)
1
and
2
at sensor
Throttle plate rotated from idle to
lull throttle, continuously variable
from 1.0
-
4.0 1tR
CAUTION-
Be sure ignition is OFF before disconnecting or reconnecting
DME svstem components.
r