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1997 civic transmission or ecu problem ??
Having problems with a 97 Civic DX with Automatic Transmission. 60k
Miles on the car. One owner. The symptoms Seems to drive fine when cold. Transmission shifts fine. After approximately 5 miles, transmission shifts a harshly. Seems to not know what gear it should be in (no codes at this time) Then after completely warm, transmission wont drive at all (like its in neutral) Can shut the car off at this point and it may or may not allow transmissin to engage. keying ignition on several time will allow the car to drive but will not shift properly. Code will appear only when transmission slips (P0700 and P0715) Have followed troubleshooting chart from Honda and Mainshaft speed sensor reads 550 ohms of resistance and wiring between pcm and sensor are good. Following troubleshooting instructions (from Honda)indicate I should try a known good PCM (ecu) and follow troubleshooting for P0720 (Output speed sensor). I am not the type of person to purchase parts unless im sure they will work (like ECM). I do not believe faults generated by ECM will lead me to the solution since the fault was generated after harsh shifting and eratic acting transmission. see first paragraph when code was generated. What do you think? Transmission started to whine before slipping. Makes noise (growling from time to time). Hard shift from time to time. and makes noise from time to time. When I reboot, sometimes it will go into 2nd and go....and sometimes it will drive in 4th and go. I have read about replacing linear solenoid when obtaining codes p0700 and p0715 after flushing transmission. I actually am hesitant to do this since the fluid is $50 and LS is $150 and Parts manager at Honda says this does not always work and also, since my sypmtoms go beyond the harsh shifting (no drive situation) Just trying to get opinions before dumping $s into a worthless trani. Tried to buy a Honda manual from Honda, they did not have one and gave me number to publisher. so any help with resistance perameters of output speed sensor would help. Also pin numbers at connector 25 at ECU (and wire color) Not sure if i can have ECU checked someplace??? Oh, one more clue ... Fluid seems a bit dark, but am unsure of flid color of honda trani flid. Original flid in trani, never has been flushed or changed. |
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#2
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Matt wrote:
> Having problems with a 97 Civic DX with Automatic Transmission. 60k > Miles on the car. One owner. > > The symptoms > > Seems to drive fine when cold. Transmission shifts fine. > After approximately 5 miles, transmission shifts a harshly. Seems to > not know what gear it should be in (no codes at this time) > > Then after completely warm, transmission wont drive at all (like its > in neutral) > Can shut the car off at this point and it may or may not allow > transmissin to engage. keying ignition on several time will allow the > car to drive but will not shift properly. Code will appear only when > transmission slips (P0700 and P0715) > > Have followed troubleshooting chart from Honda and Mainshaft speed > sensor reads 550 ohms of resistance and wiring between pcm and sensor > are good. > > Following troubleshooting instructions (from Honda)indicate I should > try a known good PCM (ecu) and follow troubleshooting for P0720 > (Output speed sensor). > > I am not the type of person to purchase parts unless im sure they will > work (like ECM). > > I do not believe faults generated by ECM will lead me to the solution > since the fault was generated after harsh shifting and eratic acting > transmission. see first paragraph when code was generated. What do you > think? > > Transmission started to whine before slipping. Makes noise (growling > from time to time). Hard shift from time to time. and makes noise > from time to time. > > When I reboot, sometimes it will go into 2nd and go....and sometimes > it will drive in 4th and go. > > I have read about replacing linear solenoid when obtaining codes p0700 > and p0715 > after flushing transmission. I actually am hesitant to do this since > the fluid is $50 and LS is $150 and Parts manager at Honda says this > does not always work and also, since my sypmtoms go beyond the harsh > shifting (no drive situation) > > > Just trying to get opinions before dumping $s into a worthless trani. > > Tried to buy a Honda manual from Honda, they did not have one and gave > me number to publisher. so any help with resistance perameters of > output speed sensor would help. Also pin numbers at connector 25 at > ECU (and wire color) > > Not sure if i can have ECU checked someplace??? > > Oh, one more clue ... Fluid seems a bit dark, but am unsure of flid > color of honda trani flid. Original fluid in trani, never has been > flushed or changed. ======================= Matt, Since your tranny fluid has SEVEN years of accumulated moisture, dirt, and friction material, it makes sense that you should start with the obvious / cheap fixes first. Here's a snip from a previous post: You run it until it's hot, unscrew the plug, drain 3.5 litres out. Wipe shavings off plug, reinstall plug, top up with 3.5 litres of Honda Z1. One week / 100 miles later you do it again. Use a painter's tray to catch it, and save it in a 4 litre jug for recycling. You don't even need a special wrench, just a 3/8" socket handle. 'Curly' |
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