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Honda service manuals list several
checks which should be made before
reading trouble codes. Problems in the
areas listed below can cause the
computer to set false or misleading
codes. Ignoring these checks can make
you miss the real cause of a code! This
can lead to the unnecessary replace-
ment of good parts. Service manual
procedures for troubleshooting a code
assume all preliminary checks are good.
These checks vary with vehicle. Typical
checks are listed below. Refer to service
manual for your vehicle requirements.
• Visually inspect electrical wiring &
connectors.
• Visually inspect vacuum hoses &
connectors.
• Perform a compression test.
• Perform an exhaust system
backpressure test.
• Perform a fuel pressure test.
• Check curb idle speed.
• Check ignition timing.
1) Make sure the
ignition key is
in the OFF
position.
2) Access the Service Check
Connector.
This 2-contact rectangular connector
is usually light blue and is located as
follows:
Accord, 1991-1992
Above the Front Passenger's Kick
Panel (right of passenger's right foot)
close to the door.
Civic, 1992
Behind the Front Passenger's Kick
Panel (right of passenger's right foot).
Prelude, 1991 (with 2.1L engine)
Under the hood, on the left fender, to
the rear of the Fuse/Relay Block. This
connector will likely have a protective
cover over the terminals.
Prelude, 1992
Behind the center console, in front of
the accelerator pedal.
Note: Search carefully for the Service
Check connector. It may be tucked away
among vehicle harnessing
3) Install the
WHITE
jumper wire
in the
Service
Check
Connector.
4) Have your
pencil and paper ready.
5) Turn the
ignition key
ON, but DO
NOT START
THE ENGINE.
6) All except 1991 Prelude with 2.1L
engine:
Get codes from the flashing
"CHECK" engine light.
1991 Prelude with 2.1L engine ONLY:
Get codes from the flashing LED.
(Engine computer must be accessed.)
• The light blinks long flashes and short
flashes.
–The duration of the LONG
flash is 2 seconds.
–The duration of the SHORT
flash is 1 second.
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