Another AT problem

[speedyfix]

orly_andico, nah... i'm certain they're not obdII compliant pa. mitsus are another matter pero honda didn't start becomming obdII untill the 2001 ES civics. all of the previous cars used the honda 3 prong connector pa. it should be easy enough to check what the problem is by grounding the connector and reading the code.

ronald_m, you're not based in the philippines right? i wouldn't jump to conclusions based on standards of different countries and them apply them right away to the philippines.

[Galactus]

I've tried re-setting the ECU by disconnecting the negative terminal of the battery for more than 5 mins., pero the D4 light is still blinking.

Pero before, when this blinked, I just turned off the engine tapos after starting it after 5 mins, di na sya nagbi-blink. Occasionally there were times na after driving for 10 mins, blink ulit. The problem was intermittent, there were days na meron, sometimes wala. For the whole month of July, di nag-blink.

But now, right after starting the engine, blink agad. Siguro pa-check ko muna sa Zee sa Aurora, kesa bumili ako agad ng surplus na tranny

[ronald_m]

orly_andico, nah... i'm certain they're not obdII compliant pa. mitsus are another matter pero honda didn't start becomming obdII untill the 2001 ES civics. all of the previous cars used the honda 3 prong connector pa. it should be easy enough to check what the problem is by grounding the connector and reading the code.

ronald_m, you're not based in the philippines right? i wouldn't jump to conclusions based on standards of different countries and them apply them right away to the philippines.

Oops.My bad.

[Galactus]

Just searched the net for possible solutions to my problem.

From what I've gathered, most likely Transmission Control Module or TCM ang problema, but according to speedyfix, wala naman daw TCM ang PHDM Hondas. So this leaves me stumped. I've tried to reset the ECU by disconnecting the negative battery terminal for about 5 mins, pero nagbi-blink pa rin.

Yung lock-up clutch kaya? Or control solenoids? Kung may TCM sana, pwedeng i-self-diagnostic.

Also, I've noticed na di na ata gumagana yung VTEC. Before kasi, pagpalo ko ng 3000rpm, ramdam ko na yung pag-change gears at tunog ng VTEC. Now, kahit 3500rpm (~120kmh), walang nangyayari. Parang at D4, di na sya nagsi-shift down, even with the pedal to the floor.

[speedyfix]

wait, baka nga tcm yan. alam ko the accords and crv's have them. it's the civics that don't.

you might be pretty hard pressed to find it tho.

you can try to see what the error code of the tranny is by grounding the circuit and reading the number of blinks ng d4 light.

[ronald_m]

USDM 93 accord has tcm. If you have one,This might help you out.Read your D4 blinks.Got this from shop manual.

code 4=Crank Angle or Crankshaft Position Sensor.
code 7=Throttle Angle or Throttle Position Sensor
code 9= #1 Cylinder position sensor
code 14= Electronic Air Control

you might also have a bad tcm. the resistors goes kaput.

[orly_andico]

i'm pretty darn sure a crankshaft sensor, cam sensor, or similar wouldn't have an effect on the tranny shifting. things like the throttle angle and cam sensors would affect idle and high-rpm operation. the air control thingie would affect the idle.

all those codes seem unrelated to the tranny (although they could affect the VTEC like the OP reports).

*galactus, why not go to the casa and have them diagnose it? wala naman sigurong bayad kung di mo ipapagawa sa kanila. definitely whether OBD-I or OBD-II or even non-OBD yan, the casa will have the tool to read it. or baka pwedeng i-DIY (speedyfix prolly knows how to do it.. or pwedeng i-google).

or maybe Zee can have a look at it.

ang alam ko sa US libre magpa-scan ng ECU. ang pinoy nga naman..

[ronald_m]

i'm pretty darn sure a crankshaft sensor, cam sensor, or similar wouldn't have an effect on the tranny shifting. things like the throttle angle and cam sensors would affect idle and high-rpm operation. the air control thingie would affect the idle.

all those codes seem unrelated to the tranny (although they could affect the VTEC like the OP reports).

ang alam ko sa US libre magpa-scan ng ECU. ang pinoy nga naman..

I know that.I'm just saying what's on the book.Scanning is not free in the US but if you're handyman you can go to Autzone and loan a scanner.


My 100% guess is TCM, The resistors goes south just like their ECU.

[orly_andico]

*ronald_m,
i meant free scanning sa autozone. or rather you can borrow their scanner for free.

ang alam ko the banawe boys repair ECU's and TCM's. but they have no skills, they just blindly replace parts. :P

although one can buy a surplus ECU or TCM for relatively cheap in banawe. the place is awash with ex-Japan ECU's and TCM's for auto trannies. an ECU for an automatic midsize car is like 2000 petot = $40. but for a manual tranny.. 5X that. i think 90% of ex-Japan salvage are automatics.

[ronald_m]

*ronald_m,
i meant free scanning sa autozone. or rather you can borrow their scanner for free.

ang alam ko the banawe boys repair ECU's and TCM's. but they have no skills, they just blindly replace parts. :P

although one can buy a surplus ECU or TCM for relatively cheap in banawe. the place is awash with ex-Japan ECU's and TCM's for auto trannies. an ECU for an automatic midsize car is like 2000 petot = $40. but for a manual tranny.. 5X that. i think 90% of ex-Japan salvage are automatics.

Does it make sense kung dalhin sa gumagawa ng tv,dvd appliances?They do have experience with boards,rather than bringing it to banawe bosy.

[SNAKE V6]

Hirap din pag hi-tek na kotse, dami na sensors!

[speedyfix]

both good and bad ang sensors.

it forces people to keep on their toes and forces old school mechanics out if they cannot adopt to the changes sa mga auto.

[Galactus]

Over the weekend, I observed the car, hindi na nga sya nagsi-shift pag nasa D3 or D4. So, after starting or from a full stop, I shift to 2 para lang maganda arangkada. But most importantly, hindi na nga nag-eengage ang VTEC. (pero hindi naman umiilaw CEL ko)

Galing me sa Banawe kahapon, hoping for a cheap and quick fix for my AT problem. Scanned the surplus shops, pero bad trip, di nila alam kung ano TCM. I had to explain what it means, but all they knew was the ECU or computer box (but even this I had to explain to them).

Pero meron amuyong dun na ni-refer ako sa isang AT mechanic, so sinamahan nya ako sa Kabignayan St. Yung mekaniko dun, after looking under the hood, disconnected this cable (shift cable ba ito?? malapit sa throttle body, opposite the accelerator cable). Tapos sabi nya sa akin, test drive mo muna, tapos balik ka dito.

[IMG][/IMG]


(paki-magnify/ enlarge na lang yung pix,its the black cable upper middle left side)

Aba, pagka-start ko, hindi na nagbi-blink yung D4 indicator, and nag-automatic ang shifting kahit D4! Maganda yung arangkada. Sadly, it lasted for only 10 seconds, nagblink ulit, then ayaw na naman auto-shift. Sabi nya rin, wala daw TCM ang Accord, ECU lang, so most probably electrical/ electronics ang problema (solenoid, etc.). But he said na hindi nga siguro transmission kasi ok pa yung gears.

Baka may expert dito on AT who can help me?

[Galactus]

Update ko lang ito.

Went to Automatic Transmission Master along Visayas Avenue last week, and came home disappointed. Obvious kasi na gusto lang nilang ipa-overhaul ko yung AT ko without a thorough diagnosis...total estimate was P31,750 (labor, repair kit, AT Filter and 10 liters of ATF)

Sablay pa nga yung diagnosis...sabi nung may-ari kakagawa lang daw nila ng Accord 2 weeks ago. Sabi nya ang common problem daw ay yung Overdrive at nagbi-blink nga daw yung D4 or N(eutral). Eh wala naman Overdrive ang Accord at D4 lang ang nagbi-blink (sa ibang Honda models abroad, yung "S"). Haven't come across any Honda model na N yung nagbi-blink

Bale ginawa nya lang, inangat yung 2 front wheels at ni-rev, while observing the tach. Walang test drive. Based on that, sabi nya problema daw yung "1" at "D4" Eh, ok pa naman hatak ng all gears, the main problem is that hindi nga automatic ang shifting when in D3 or D4. Less than 2 mins. lang ang observation, tapos recommendation agad is overhaul. Sana kahit yung electrical is na-check, kasi dun talaga ang suspect ko

[niky]

Actually D4 nga ang Overdrive, but yeah, it sounds fishy.