zenon8890

hi HT, i have 98 LX and i think my auto tranny is slipping and i have a code automatic gearbox malfunction, so i'm gonna get another one easier than fixing, is it better to get the 95 civic JDM d15b vtec auto tranny?! or the 98 d15b?! i dont live in the US so its hard to get the d16y7 tranny, but its not impossible,

what will be the diffrance?!

slowcivic2k

Before you go pulling out the "diagnostic shotgun" like so many other people do, find out what the issue is with the current transmission.

A failure of one of the shaft speed sensors will throw a slip code, because the sensor is detecting a speed slower than normal for the particular gear in use. If it is not identifying a specific gear, I would take a quick stab and say shaft speed sensor, either the countershaft or mainshaft. Hell a loose connection could be the cause, check stuff before you condemn it.

If you do get a replacement trans, make sure it is a 96-00 trans, as these are electronically shifted transmissions. Here is a quick rundown of the transmissions from 1988-2000.

88-91's:
4 Speed/R/TCC
Hydraulic Shift Transmission
1 On/Off solenoid for the Torque Converter Clutch
TV Cable and internal governor

92-95's:
4 Speed/R/TCC
Hydraulic Shift Transmission
2 Trim Solenoids for Torque Converter Clutch
TV Cable and internal governor

96-00's:
4 Speed/R/TCC
Electronic Shift Transmission
2 Shift Solenoids for 1/2/3/4/R
3 Trim Solenoids for Torque Converter Clutch
No TV Cable or governor (Electronic)

I haven't seen too many JDM automatic transmissions on US engines, but I know the JDM automatic 88-91 trans has 2 trim solenoids for the TCC, and mine only has 1 (On/Off Solenoid) (1991 DX Hatch) I would suggest making sure the replacement that you buy has the two shaft speed sensors, and five solenoids externally mounted on the case.

Since most JDM cars have more "goodies" the 92-95 cars could have had electronic shift transmissions before the US got them, so beware. I would highly suggest finding a 96-00 transmission. You must use the ECU that corresponds to that transmission type. (IE a 92-95 ECU will not operate a 96-00 Transmission.)

zenon8890

thanks for the info, but i know my tranny is slipping cuz its acting wierd and not smooth anymore

slowcivic2k

It will act weird, the transmission will protect itself from blowing up until you address the problem, this ensures that other components are not damaged as a result.

zenon8890

so what should i check?!

slowcivic2k

https://honda-tech.com/zerothread/1901557

Use that and tell us what the code is for, or, if you do not wish to do that, if you know a place that has an OBD2 scan tool, ask them if they can read the code that it is throwing.

ifIexplode

Is your D4 light blinking?
The only code a check engine light will throw is 70.
Automatic transmission malfuntion.
If your D4 light is blinking that will throw a code just like the Check engine light.

Alot of times when auto transmission slip is because of low fluid.

I could never find Automatic transmission Failure codes online.I searched alot. Try and find a OBDII scan tool to tell you exactly what the problem is.

zenon8890

yes it was blinking but not anymore, cuz i put new oil an reset the ecu, the it stoped blinking