FUEL SYSTEM (DFI) 3-89
Throttle Body Assy
Throttle Body Assy Assembly
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Install the drain tube [A], if removed
•
Install the inlet air pressure sensor [B]
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Tighten:
Torque - Inlet Air P ressure Sensor Mounting Screw [C]: 5.0
N·m (0.51 kgf·m, 44 in·lb)
•
Connect the vacuum hose [D].
Engine Vacuum Synchronization Inspection
•
Remove:
Side Covers (see Left and Right Side Cover Removal in
the Frame chapter)
Throttle Link Case Cover
•
Check idle speed.
•
Remove:
Clamps [A]
ISC Valve Tube (Front) [B]
ISC Valve Tube (Rear) [C]
•
Connect the vacuum gauge [A] as shown.
Special Tools - Vacuum Gauge: 57001-1369
Vacuum Gauge Adapter [B]: 57001-401
•
Start the engine and read the intake vacuum when idling.
If the vacuum is out of the specified range, adjust it.
Engine Vacuum Synchronization Vacuum
Standard: 29.6 ±1.3 kPa (222 ±9.8 mmHg) at Idle Speed
Engine Vacuum Synchronization Adjustment
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Turn in the bypass screws until it seats fully but not tightly.
Special Tool - Pilot Screw Adjuster, A: 57001-1239
CAUTION
Do not over tighten them. They could be damaged,
requiring replacement.
•
Turn out the bypass screw of the higher vacuum between
#1 [A] and #2 [B] to the lower vacuum.
○
In this photo, the throttle body has been removed for clar-
ity.
•
Open and close the throttle valves after each measure-
ment and adjust the idle speed as necessary.
•
Inspect the vacuums as before.
If both vacuums are within the specification, finish the en-
gine vacuum synchronization.
If any vacuum can not be adjusted within the specification,
remove the bypass screws #1, #2 and clean them.
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