TROUBLE CODES
System Diagnosis
READING CODES
When the "Check Engine'' warning light on the dashboard comes on and stays on, it indicates a problem in the fuel injection/emissions system. Check the ECU for fault codes. On certain models, some codes will not trigger the check engine light; if driveability has suffered, check for stored fault codes.
The most common error when using fault codes is to assume the indicated component has failed rather than checking the entire circuit. The presence of a trouble code means simply that the electrical circuit for the named component is not functioning properly. For example, a code for the oxygen sensor circuit does not automatically mean the oxygen sensor has failed. A wire terminal may simply be loose or corroded at the connector. When using diagnostic or fault codes, always remember that the entire circuit including the component must be checked carefully.
On 1990-95 Accord (except V-6) and 1992-95 Prelude, the codes are read from the check engine light after the two-wire service connector has been jumpered. On Accords, the service connector is under the dash on the passenger side. On Preludes, it is located behind the center console. Codes 1 through 9 are indicated by a series of short flashes; two-digit codes use a long flash for the first digit followed by the appropriate number of short flashes. For example, Code 14 would be indicated by 1 long flash followed by 4 short flashes. Codes are separated by a pause between displays. Multiple codes are transmitted in an alternating pattern. For example, a code 3 and 14 would be displayed as 3 short flashes (for Code 3) followed by the separator pause, then 1 long flash and 4 short flashes (for Code 14).
Fig. 7: Fault codes are read from the check engine light on most late-model vehicles
Fig. 8: On Accords, the service connector is located under the dash on the passenger side
Fig. 9: The service connector on Preludes is located behind the center console
Fig. 11: Fault code chart for 1994-95 Accords (four cylinder)
Fig. 12: Fault code chart for 1992-95 Preludes
The system on1990 honda accord is short 6 flashes.i changed the ecu sensor now the gauge now works but the fault codes 4,the coolant is still there sos.
SOURCE: 1990 HONDA ACCORD VALVE COVER SEALS.
They go UNDER the valve cover in the slight recesses around the plug holes(might use a dab of RTV sealant to keep them in place, or do so by adhering them to the recesses in the valve cover itself, making sure to let the sealant dry a bit so they do not fall out when you put the valve cover in place), NOT down in the plug holes from the top as some people seem to think.
Hope this helps you.
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SOURCE: 1990 Honda accord horn problem
Horn fuse should be located in the fuse box under the dash on drivers side kick panel. If fuse is good try replacing the horn itself, it might be bad due to the age of the car. They are located behind the front bumper on the left and right side.
SOURCE: 1990 Honda Accord Fast Idle Problem
usually idle that goes up and down is cause by a bad "idle control valve" located near the throttle body. Needs to be replace.
SOURCE: how to replace clutch kit for a 1990 honda accord?
Go to your local library and check out one of their service manuals.They are free and you can check them out anytime.As long as you return them.Good luck.
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