Honda Civic Service Manual page 367

Intake Air System
Throttle Body Test
NOTE:
. Do not adjust the throttle stop screw. lt is preset at the
factory.
. l f t h e m a l f u n c t i o n i n d i c a t o r l a m p ( M l L ) h a s b e e n
reported on, check for diagnostic trouble codes
( D L C S ) ( s e e p a g e 1 1 3 ) .
1. With the engine off, check the throttle cable
movement. The cable should move without binding
o r s t i c k i n g .
. lf lhe cable moves OK, goto step 2.
. lf the cable binds or sticks, check it and its routing.
. l f t h e c a b l e i s f a u l t y , r e r o u t e i t o r r e p l a c e i t a n d
a d j u s t i t ( s e e p a g e 1 1 - 1 6 3 ) , t h e n g o t o s t e p 2 .
2. l\4ove the throttle lever by hand to see if the throftle
valve and/or shaft are too loose or too tight.
. lf there is excessive play in the throttle valve
shaft, or any binding in the throttle valve at the
fully closed position, replace the throttle body.
. l f t h e t h r o t t l e v a l v e a n d s h a f t a r e O K , g o t o s t e p 3 .
3. Connect the scan toolto the DLC.
T u r n t h e i g n i t i o n s w i t c h O N ( l l ) .
Check the throttle position with the scan tool. The
reading should be about 10% when the throttle is
fully closed and about 90% when the throttle is fully
o p e n e o .
. lf the throttle position is correct, the throttle body
i s O K .
. lf thethrottle position is notcorrect, replace the
throttle body.
5 .
1 1 - 1 6 0
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