Subsection 01 (ELECTRONIC FUEL INJECTION (EFI))
NOTE:
The multifunction gauge and B.U.D.S. use
the same signal to provide the engine RPM indi-
cation.
CLOSED THROTTLE AND IDLE
ACTUATOR RESET
This operation performs a reset of the values in
the ECM.
This reset is very important. The setting of the
TPS will determine the basic parameters for all
fuel mapping and several ECM calculations and
the setting of the idle air control valve will deter-
mine the basic parameters for the idle speed con-
trol of the engine.
Closed throttle and idle actuator reset must be
done if:
– TPS is loosened, removed or replaced
– Throttle body is replaced
– Idle air control valve is replaced
– ECM is replaced.
NOTICE
An improperly set TPS or IACV may
lead to poor engine performance and emission
compliance could possibly be affected. In ad-
dition, improper IACV reset may lead to poor
engine starting, improper idle (too low or too
high) and engine stop on deceleration.
Remove throttle body cap and ensure the throttle
cam of throttle body rests against set screw with-
out any tension in the cable.
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1. Contact here
2. Free-play here
Open throttle approximately one quarter then
quickly release. Repeat 2 - 3 times to settle throt-
tle plate. If stopper does not rest against its stop
lever, perform throttle cable adjustment. Refer to
THROTTLE CABLE
in this subsection.
To reset IACV and TPS, perform the following:
1. Connect the vehicle to the latest applicable
B.U.D.S. version, refer to
COMMUNICATION
TOOLS AND B.U.D.S.
subsection.
2. In B.U.D.S., click the following:
–
Read Data
button
–
Setting
tab
–
ECM
tab
3. Click on the Reset button in the
Closed Throt-
tle and Idle Actuator
area.
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If operation is wrong, an error message will be dis-
played.
If TPS is not within the allowed range while re-
setting the Closed Throttle and Idle Actuator, the
ECM will generate a fault code and will not accept
the setting. Repeat the reset procedure.
4. Start engine and make sure it operates nor-
mally through its full engine RPM range. If
fault codes appear, refer to
DIAGNOSTIC AND
FAULT CODES
subsection for more informa-
tion.
TROUBLESHOOTING
DIAGNOSTIC TIPS
Engine problems are not necessarily related to the
fuel injection system.
It is important to ensure that the engine and
propulsion system, fuel delivery and electrical
systems are functioning normally.
For diagnostics purposes, use B.U.D.S. software.
See
COMMUNICATION TOOLS AND B.U.D.S.
subsection.
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