I have 2002 accord sometimes when i come to a stop shift hard to first gear and d4 for is flashing tcu and check engine light comes on and starts shifting hard when i turn of the car and start it it drives fine thinking its the tcu need to be changed
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Re: where is the tcu in a 2002 honda accord
It is the Transmission Control Unit. you have to find the reason why the TCU is flashing the D4 fault code. not replace the unit. have your vehicle scanned for another code. your transmission or transaxle is giving you a warning that something is wrong .
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HI. This is a TCU fault. This is intermittently occurring at this time, but it will eventually get worse. You will need to have the TCU scanned for possible transmission trouble codes. I suspect that the TCU will need to be replaced or there may be an issue concerning the solenoid pack. You will need those codes to know for sure.
Flashing D4 light is an error from the TCU (transmission control unit), so you got something going on with your transmission. If you want to pull the error code, remove the passengers side kick panel and look for a pair of wires with a blue connector at the end. Stick a paper clip or some other piece of wire into each hole of the connector to short the wires. Put your key in the ignition and turn 2 clicks. The D4 light will flash the code...short flashes=1 and long flashes=10. Add the number of short and long flashes to get your code. Errors are below:
0-Transmission control unit (TCU) faulty. 1-Lock-up solenoid 'A' circuit open or shorted. 2-Lock-up solenoid 'B' circuit open or shorted. 3-Throttle Position Sensor circuit open or shorted. 4-Vehicle Speed Sensor open or shorted - No signal from speedometer. 5-Shift Lever Position Switch circuit shorted. 6-Shift Lever Position Switch circuit open. 7-Shift Solenoid 'A' circuit open or shorted. 8-Shift Solenoid 'B' circuit open or shorted. 9-Counter shaft or transmission speed pulse generator open or shorted. 10-Coolant Temperature Sensor open or shorted. 11-Engine RPM (Ignition coil signal) open or shorted. 12-(No code 12 used) 13-Main shaft speed pulse generator open or shorted. 14-Linear (line pressure control) solenoid open or shorted. 15-Kick down switch circuit shorted.
your transmission has external shift solonoids towards the front one is for 2 gears and the other for the other two i believe the lower one is the one you want ot replace they rust up and start binding inside.
What is is causing this is a faulty, damaged, or otherwise inoperative TCU or Transmission Control Unit. Very simple fix that most anyone can do with a proper diagram. If you are able to get hold of a graphic diagram you simply have to disconnect the battery, take out the two plugs that plug into the bottom of the computer, and replace the unit. If you are going to do this yourself I would advise spoending a very small amount and purchase a "Memory saver" so that you will not have to worry too much about the car having to "Relearn" itself. you can usually pick a decent TCU from a junk yard for anywhere between $50-$125.