I have read people claim that all pm6 in the US are manual 5 speed.
In this thread. https://honda-tech.com/honda-crx-ef-...trans-3251232/ one of the responders says they are out there, the auto pm6. Well, i pulled a pm6 from a rt4wd wagon that was automatic. I read the rt4wd wagons had a stand alone ecu to control the transmission shifting, and that they use manual pm6 ecus. BUT this wagon had a sohc zc, will probably came with the ecu from japan, which maybe there might have been auto pm6s over there?? I have 3 pm6s, 2 i know are manual, L09 and L130 are the last numbers. But this pm6 from the wagon is L520, isnt it 0-4 manual and 5-9 auto?
Is there a resistor inside to check if it controls the torque converter?

 

Yes, 90-91 Civic EX sedans also have the D16a6 motor with the mpfi and some are auto pm6.

 

We have auto Si hatches in Canada. You could dig up an ecu if poked around a bit

 

the 90-91 ex sedan ecu is a ps9. basically the pm6 with the torque converter lockup control added. for example the ps9-a50 is the 1991 ex auto sedan ecu.

 

So what does the control look like inside the ecu, do you know?

 

Ok so having both ecus open side by side, the l520 ecu ( which i think is auto) has a resistor up top in IC17, which i think is next to the injectors. Then the only other different spots i noticed was Q11 and C31 in the L520 ecu. Could one of these be for the torque converter?

 

the only way i know how to tell them apart is the resistors, its been a long time since i converted anything from auto to manual. i think there are pm6's that are auto, they just did not exist in the US market. if you cant find it on google lay the ecus out with cases open and compare...what was the ecu code that was in the auto wagon anyway?

 

USDM 89 Civic 4WD wagon D16A6 with automatic transmission had a PM6 ECU as did the 90-91 4WD wagons

 

<p>^^^^<br />I've been trying to see if anyone can confirm that the 4WD PM6 is actually the same as the Si.</p><p>The 4WD has an other box outside of the ECU that controls the transmission.<br />This is unlike the EX Sedan PS9 which only has the ECU to control the LockUp solenoid.</p><p>So, not sure if the PM6 on the 4WD can actually control the LockUp if you put it on any other car.</p>