Question about 1991 Honda Accord
When I drive my 1990 Honda Accord EX, usually on the free way, the green sports select light starts flashing in the dash, then it kinda feels like the transmission sort of lurches, like it loses 500 rpms or so then the speed-o stops working and the check engine light comes on. This has been happening since I purchased the car and Ive already replaced the transmission so I kinda think its an electrical issue. Anyone have any experience or insight on this??
This sounds like a failed or failing transmission control computer. I have been struggling with a 91 accord with similar symptoms for weeks. The computer often fails by way of a capacitor leaking, and I suspect this may occur as a result of faulty or stuck shift solenoid valves. There is no electrical protection betweeen the solenoids and computer. Disconnect the solenoid wiring harnesses, and check for a click when applying battery voltage to each pin (4 total in 2 connectors). You can also check for resistance at each of these pins. They are chassis gorunded, so attach the - side of your meter to a bolt on the trans. housing. Resistance should be 12-24 ohms on each solenoid. The speedo cutting out also suggests a failing vehicle speed sensor. Sometimes the connector for this sensor can melt or short. It is on the back side top of the trans. housing, roughly below the water neck. It can be removed by taking out 2 10mm bolts on either side of it. Finally, the shifter interlock solenoid in the shifter column can cause trouble. If there is a light rattling sound when going into drive, this is probably the cause. Do not repair or replace the trans. computer until after you have determined all of these items are in good order, or it may burn again. Also, beware reman computers in the aftermarket. They are often very shoddy. I suggest finding a low mileage salvage unit from a 91 accord. This is a compatible but updated version of the unit used in the 90 model. Just make sure the model designation is compatible (ie. dx/lx is different from ex). Good luck. You are going to need it.
Posted on Nov 17, 2009
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Posted on Jan 02, 2017
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