Section 04
FUEL SYSTEM
Subsection 02
(FUEL INJECTION)
04-02-15
ADJUSTMENT
THROTTLE POSITION SENSOR
(TPS)
This adjustment is very important. The setting of
the TPS will determine the basic parameters for
all fuel mapping.
The adjustment of the TPS is performed using the
MPEM programmer.
Closed TPS
To perform this adjustment, proceed as follows:
Access the
BOSCH SYSTEM
in the MPEM pro-
grammer. Then, select
ADJUSTMENT
in the sub-
menu.
Choose
CLOSE TPS
in the
ADJUSTMENT
menu.
The screen will display the actual adjustment of
the TPS in degrees and it will also offer to adjust
it.
Loosen the lock nut of the idle speed screw.
Loosen the idle speed screw until it does not con-
tact the throttle plate stopper.
Selecting
“YES”
will instantly readjust the close
throttle position adjustment to the new setting.
NOTE:
If the ECU is replaced, the TPS must be
readjusted.
Idle Speed
Turn idle speed screw until it touches the stopper.
Turn idle speed screw 2-3/4 turns as a preliminary
adjustment.
For a precise adjustment of the idle speed, it
should be finalized in water.
Idle speed in water is 1400 ± 50 RPM.
NOTE:
The ECU is programmed to maintain idle
speed at 1400 RPM. The ECU has the learning ca-
pacity to compensate if the idle speed is not pre-
cisely set at 1400 RPM. The ECU will correct the
idle speed, step by step, each time the engine is
started. Trying to set idle speed different than spec-
ified may cause rough idling.
-
CAUTION
An improperly adjusted TPS may lead to se-
rious engine damage.
-
CAUTION
Do not select “YES” until the idle speed
screw is loosened to allow the throttle plate
to close.
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