For instance, the Foxwell scanner is specifically designed for Honda and Acura vehicles. The best scanners for Honda vehicles are geared toward these brands. I can’t fix this kind of damage – ECU IS TOAST.Before buying a Honda OBD scanner, you should know which features to look for. Defcon 4 underside: Q31 looks salvageable but the upper section is a no go. The PCS does not throw a CEL when it is not working due to a burnt Q31.īurned Q31 Examples: Burnt af Q31 transistor Luckily this one can be saved as the solder pads are still there. The good thing is it can be removed completely for engine swap purposes if emissions isn’t a priority. Sometimes, the Q31 can burn out so bad it will damage the board making it impossible to replace. The voltage for either of these guys are completely different and the result is the burning out of the IAT sensor tip and the Q31 transistor on the ECU. Usually, when an engine swap is performed on a 92-00 Civic, it’s easy to overlook and mistakenly plug the PCS into the IAT sensor (intake air temp found on the left side intake runner) since they share the same style round 2-wire connector. The evap purge control solenoid or PCS (an emissions related solenoid found on the back left side of OBD1 D-series and some B-series intake manifolds) is what the Q31 transistor regulates. It’s not a guarantee the IC17 will bring an ECU back to life but its a first start. IC17 is a hub of power activity and regulation for the ECU and the fuel pump activity is one of its jobs. From my experience, the “Integrated Circuit” 17 zip aka IC17 chip seems to be more of the culprit than the capacitors. If you’ve experienced intermittent or no fuel pump activation, it can be due to bad capacitors and/or a bad IC17 chip. They can make the vehicle seem sensitive to cold/warm conditions such as no start-ups after the car is warmed up or when the car is cold. They can have a hand in causing the fuel pump to not activate or intermittently activate along with other possible symptoms. They can also omit a fishy-like smell (if smelt up close or warmed up from de-soldering). This fluid can also grow a weird turquoise-y mold/fuzz on the legs of the capacitor. With these old ECU’s, the capacitors can reach a point where they leak out their inner electrolyte fluid eventually staining the main board which can be potentially damaging. They have several common issues you may or have yet to experience but are mostly repairable and can breathe new life into the ECU. They’re coming up just shy of 30 years and are sadly beginning to show their age sadly. OBD-1 ECU’s are the best era ECU HANDS DOWN.
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