Instruction manual

28
HONDA
Vehicle Preparation
Complete ALL steps in this section before proceeding to Reading Trouble
Codes.
IMPORTANT: Reading trouble codes on 1985 - 1990 (all models) and 1991 Civic,
CRX, & Prelude models, requires access to the engine computer. Due to varying
mounting locations and methods, some mechanical disassembly may be
required! Refer to the Computer Location table in step 3 below. If you are unfamiliar
or uncomfortable with the disassembly required, you may want to get help from
another person before proceeding.
1) Safety First!
• Set the parking brake.
• Put the shift lever in PARK or Neutral.
• Block the drive wheels.
• Make sure all accessories are turned
OFF
• Make sure the ignition key is in the
OFF position.
2) Test the “PGM-FI” Light
(Also called
“CHECK”, with a
small engine
picture, or “PGM-
CARB”.)
• Turn the ignition
key from the OFF to the ON position,
but do not start the engine!
• Verify that the light turns ON for 2
seconds.
• If the light does not turn on, you have
a problem with this circuit which
should be repaired. Refer to the
vehicle service manual. Some
publications have this information in
books or sections called “Computer-
ized Engine Controls”, “Electronic
Engine Controls” or “Tune-Up
Information.”
• Turn the ignition key OFF.
IMPORTANT:
• 1985-1990 (all models) and
1991 Civic, CRX, Prelude:
Go to step 3.
• All other models: Go to step 5.
PGM-FI
3) Locate the Engine Computer
Note: Honda
refers to the
engine
computer as
the ECU
(Electronic
Control Unit).
Accord, 1985 - 1990
Under driver’s seat
Accord, 1991 - 1992
Under front passenger’s footwell
(beneath the carpeting, below the
dashboard)
Civic, 1988 - 1991
Under front passenger’s footwell
(beneath the carpeting, below the
dashboard)
Civic, 1992
Behind front passenger’s kick panel
(right of passenger’s right foot)
Civic Si 1986 - 1987
Under front passenger seat
Civic CRX Si, 1985-1987
Under front passenger seat
Civic CRX Si, 1988
Under front passenger’s footwell
(beneath the carpeting, below the
dashboard)
CRX, 1989 - 1991
Under front passenger’s footwell
(beneath the carpeting, below the
dashboard)
Prelude, 1986 - 1987
Behind left (driver’s) side rear seat
trim panel
Prelude, 1988 - 1992
Under front passenger’s footwell
(beneath the carpeting, below the
dashboard)