Remove the bypass screw [A], spring [B], washer [C] and
Check the bypass screw and its hole for carbon deposits.
If any carbon accumulates, wipe the carbon off the bypass
screw and the hole, using a cotton pad penetrated with a
high-flash point solvent.
Replace the O-ring with a new one.
Check the tapered portion [E] of the bypass screw for
wear or damage.
If the bypass screw is worn or damaged, replace it.
Turn in the bypass screw until it seats fully but not tightly.
Repeat the same procedure for other bypass screws.
Repeat the synchronization.
If the vacuums are correct, check the output voltage of the
main throttle sensor (see Output Voltage Inspection of the
Main Throttle Sensor in the Fuel System (DFI) chapter).
Main Throttle Sensor Output Voltage
Connections to ECU
Meter (+) → Y/W lead (terminal 7)
Meter (–) → BR/BK lead (terminal 28)
Standard: 1.02 ∼ 1.06 V DC (at idle throttle opening)
If the output voltage is out of the range, check the throttle
input voltage (see Input Voltage Inspection of the Main
Throttle Sensor in the Fuel System (DFI) chapter).
Remove the vacuum gauge hoses and install the vacuum
hoses [A] and rubber caps [B] on the original position as
Except California Model [D]
California Model [E]
PERIODIC MAINTENANCE 2-21