Throttle Body Test - Honda Civic 2002-2003 Service Manual

Intake Air System
Throttle Body Test
NOTE:
• Do not adjust the throttle stop screw. It is preset at the
factory .
• If the malfunction indicator lamp IMILI has been
reported on, check for diagnostic trouble codes
IDLCsiisee page 11-31.
1. With the engine off, check the throttle cable
movement. The cable should move without binding
or sticking.
• If the cable moves OK, go to step
2.
• If the cable binds or sticks, check it and its routing.
• If the cable is faulty, reroute it or replace it and
adjust it Isee page 11-1631, then go to step 2.
2. Move the throttle lever by hand to see if the throttle
valve and/or shaft are too loose or too tight.
• If 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.
• If the throttle valve and shaft are OK, go to step 3.
3. Connect the scan tool to the DLC.
4. Turn the ignition switch ON 1111.
5. 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
opened.
lithe throttle position is correct, the throttle body
is OK.
If the throttle position is not correct, replace the
throttle body.
11-160
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