Section 07 ENGINE MANAGEMENT (DI)
Subsection 02 (COMPONENT INSPECTION AND ADJUSTMENT)
Remove pressure gauge and reinstall fuel hose.
At installation apply engine oil on O-ring.
If pressure is out of limits, proceed with all the
tests.
AIR INDUCTION SYSTEM
THROTTLE BODY
Mechanical Inspection
Check that the throttle plates moves freely and
smoothly when depressing throttle lever. Take
this opportunity to lubricate the throttle cable.
IMPORTANT: The throttle bodies are designed to
be tamper proof. Changing the idle stop or mod-
ifying them in any way will not increase perfor-
mance or change the idle speed.
Before replacing any parts, check the following as
these could be causing the fault. Perform the test
while the engine is not running.
– Throttle cable adjustment too tight. Not return-
ing fully to idle stop.
– Throttle body idle set screw is loose or worn.
– Throttle linkage between the two throttles has
moved.
– TPS is loose.
– Corroded or damaged wiring or connectors.
– Throttle body has been replaced and the closed
TPS reset has not been performed.
– MPEMhasbeenreplacedandtheclosedTPS
reset has not been performed.
Electrical Inspection
Refer to THROTTLE POSITION SENSOR (TPS) in
ELECTRONIC MANAGEMENT below.
Replacement
Removal
To remove throttle bodies from engine, proceed
as follows:
– Remove air intake silencer. Refer to AIR IN-
TAKE section.
– Disconnect TPS connectors.
– Disconnect throttle cable and oil injection pump
cable.
– Detach hoses and remove fasteners retaining
throttle bodies and pull out together.
If only one throttle body replacement is required,
detach them and remove the sealant on idle set
screw head. Gently remove the plastic cap from
the synchronization screw.
Remove TPS, throttle lever, spring and guide from
the old throttle body.
Installation
Reinstall removed parts on the new throttle body.
For TPS replacement procedures, refer to THROT-
TLE POSITION SENSOR (TPS) in ELECTRONIC
MANAGEMENT below.
Properly attach throttle bodies together if previ-
ously detached.
Adjustment
Throttle Body Synchronization
NOTE: If both throttle bodies are replaced togeth-
er with new ones, no synchronization is required
as it has already been set at the factory. Howev-
er, proceed with throttle cable and closed TPS ad-
justments as described below. If only one throttle
body is replaced, proceed with the complete fol-
lowing adjustments. Ensure to perform all the ad-
justments prior to starting the engine. Otherwise,
engine may run at a limited RPM in limp home
mode.
IMPORTANT: The throttle body synchronization is
required only when replacing one throttle body.
Otherwise, do not tamper with it as this is NOT
a regular maintenance procedure.
The master throttle body is the one driven by the
throttle cable. The slave throttle body follows the
master and must be synchronized with the mas-
ter.
smr2004-Complete Line Up 339
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