Shift Solenoid 'B' circuit open or shorted?

1990 HONDA ACCORD
120,000 MILES • 2.2L • 4 CYL • 2WD • AUTOMATIC
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TULEL1
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I have been getting that shift solenoid issue even after removing and replacing the part. The transmission shift when cold but when driving temperature, it loses power and shifts hard on the gear esp 3 and 4 so i was able to go to gear 1 to be able to move.
Jul 19, 2025 at 8:38 AM
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STRAILER
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Circuit open means there is no connection from the shift solenoid and the automatic control unit, here is the wiring diagrams for it and a guide to help you with the testing.

https://www.2carpros.com/articles/how-to-check-wiring

Check out the images (below). Let us know how it goes
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Jul 19, 2025 at 9:59 AM
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TULEL1
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I have replaced the solenoid and the coolant sensor but i still have the egine lights and s lights 6 check engine and 8 on the s lights
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Aug 9, 2025 at 12:12 PM
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STRAILER
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Did you disconnect the battery to clear the codes?
Aug 10, 2025 at 5:45 PM
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TULEL1
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I did that numerous times then changed all the coolant sensors but still have same issue. I have some spare tcu/ecu and had swapped them once so i dont know if that makes a difference
Aug 14, 2025 at 5:12 PM
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STRAILER
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So we need to check the wiring from the solenoid to the ECU, use the diagrams above and this guide to help check the wiring, grn/wht and blu/yel

https://www.2carpros.com/articles/how-to-check-wiring

Please go over this guide and get back to us.
Aug 15, 2025 at 11:48 AM