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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 engine computer
LED is easily viewable.
2) Have your pencil and paper ready.
3) Turn the
ignition key
ON, but DO
NOT START
THE ENGINE.
34
4) Get codes from the flashing LED.
• The LED blinks long flashes and short
flashes.
–The duration of the LONG
flash is 2 seconds.
–The duration of the SHORT
flash is 1 second.
For codes 1 through 10...
– Count SHORT flashes to get the code.
Example of code 4:
For codes 11 through 99...
– Count LONG flashes to get the first
digit.
– Count SHORT flashes to get the
second digit.
– Combine digits to get the code.
Example of code 12:
The pause between the first and second
digits is 2 seconds.
Remember:
– If SHORT flashes come first, the code
is 10, or less.
– If LONG flashes come first, it is the
first digit of a two digit code.
The pause between codes is 2 seconds.
PAUSE
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