"check transmission" LED on 4jg2 trooper bighorn

[attic_dude]

isuzu experts, i need your help...

i few days ago i was driving my bighorn when suddenly the "check transmission" LED on the dash started blinking. but before that i also noticed that the speedometer started to become erratic and stopped working. i also noticed that once the LED started blinking i was experiencing delayed shifting. i checked all fluid levels and everything is normal. can anyone shed some light on what is causing the "check transmission" LED to blink?

weird thing is, this does not happen all the time. and at ignition the LED does not blink and works normally. its only after driving the vehicle for a certain amount of time does the LED start to blink. and when it does

i hope someone can also recommend a mechanic who knows the internal workings of a converted unit (lalo na yung mga sensors, etc). maraming salamat po in advance.

[Galactus]

isuzu experts, i need your help...

i few days ago i was driving my bighorn when suddenly the "check transmission" LED on the dash started blinking. but before that i also noticed that the speedometer started to become erratic and stopped working. i also noticed that once the LED started blinking i was experiencing delayed shifting. i checked all fluid levels and everything is normal. can anyone shed some light on what is causing the "check transmission" LED to blink?

weird thing is, this does not happen all the time. and at ignition the LED does not blink and works normally. its only after driving the vehicle for a certain amount of time does the LED start to blink. and when it does

i hope someone can also recommend a mechanic who knows the internal workings of a converted unit (lalo na yung mga sensors, etc). maraming salamat po in advance.

I assume your ride is AT. I dont own an Isuzu, but I have an idea on what's causing your problem. The blinking LED on the dash is similar to Honda's blinking "D4" light. Since that sensor is dependent on the speedometer/ tachometer for shifting points, fixing the speedo will solve your problem.

Anyway, sabi mo naman the AT fluid level is ok, and smells ok...

[attic_dude]

good insight galactus, but what would explain yung delayed shifting? ganito kasi yung order ng symptoms niya:

1. speedometer stops working

2. check transmission light blinks

3. delayed shifting occurs.

sorry, forgot to mention na AT yung bighorn namin.

[momoyster]

i think the delayed shifting is probably a "limp mode" or "safe mode" of your car. with today's complex ECUs, any perceived malfunction that the ECU detects causes the vehicle to run in safe mode; meaning, the car will not run to its full capacity because safe mode is only meant to bring the car to the nearest shop or service center.

i don't own an isuzu as well but i can give you an analogy of what happened to my bmw while driving on edsa. all of a sudden, my abs warning light and drivetrain warning lights came on. apart from the warning lights, the AT experienced delayed shifting, up to the point it wouldn't shift up from 2nd gear. when i brought it to autohaus bmw in libis, i was told that safe mode or limp mode prevented me from going fast in view of the warning lights that's why the transmission would no longer shift up. turned out that i had a busted wheel speed sensor on the driver's side front wheel. from the looks of it, your problem might be sensors as well, specifically electronic in nature

[speedyfix]

yeah, parameters of the computer are dependent on certain sensors like the one that powers the speedo. if it's busted, the engine can't get the correct readings kaya that's what happens.

[attic_dude]

hmmm, that makes alot sense speedyfix and momoyster, salamat. one other thing that i noticed, that might support your answers, is that yung mechanic namin disconnected kasi yung battery ng isuzu, after a few minutes binalik niya and i started to test drive the vehicle. i noticed right away that everything was working fine. pati yung shifting. then after a few kilometers ayan nanaman.

ang problem ko ngayon is sino kaya pwede tumingin ng isuzu namin? speedyfix kaya niyo ba mag ayos ng big horn?

[alwayz_yummy]

just prepare for the worse, replace a/t..............

[speedyfix]

we can check it out naman for you if we don't fix it we don't charge you naman

[attic_dude]

uy, salamat speedyfix!!

alwayz_yummy, what do you mean palit a/t? yung transmission ba? but i just bought i new one e. local a/t ng trooper.

[dieselNUBI]

good insight galactus, but what would explain yung delayed shifting? ganito kasi yung order ng symptoms niya:

1. speedometer stops working

2. check transmission light blinks

3. delayed shifting occurs.

sorry, forgot to mention na AT yung bighorn namin.

yes yes yes i experienced all of the above on my isuzu crosswind. This was caused by dirty transmission oil, which resulted to my speed sensor breaking down. Electronic problem lang yan. Palit ka speed sensor. mga 3taw mahigit ata e. Palit kana rin ng transmission oil, sa tingin ko madumi na.

[dieselNUBI]

yung mechanic namin disconnected kasi yung battery ng isuzu, after a few minutes binalik niya and i started to test drive the vehicle. i noticed right away that everything was working fine. pati yung shifting. then after a few kilometers ayan nanaman.

same thing as mine. pag bagong start ok pa sya. after a while ayan na. dont worry too much. i had mine checked at isuzu bulacan. they used a computer to find the fault.

at first kala ko barado lang un oil filter ko. pinalitan ko din. wala nangyari. hehe

[attic_dude]

wow dieselNUBI! salamat sa post mo!! looks like we have the same problem! ang problema ko nalang my ride is a converted unit and i dont think isuzu casa will accept my vehicle. is there a way to check the electronics without having to go to isuzu casa?

btw, is transmission oil the same as ATF? sorry, di ko kasi alam yun e.

[Galactus]

btw, is transmission oil the same as ATF? sorry, di ko kasi alam yun e.

Normally, when kotse peeps say "transmission oil," (or gear oil) it usually refers to MT vehicles...

But it's quite apparent that in DieselNubi's prior post, he experienced the same symptoms as yurs, including the Check Transmission Light (which is not present in MT's), so I guess in that context, he meant "transmission oil" = ATF

[attic_dude]

Normally, when kotse peeps say "transmission oil," (or gear oil) it usually refers to MT vehicles...

But it's quite apparent that in DieselNubi's prior post, he experienced the same symptoms as yurs, including the Check Transmission Light (which is not present in MT's), so I guess in that context, he meant "transmission oil" = ATF

gotcha galactus! DieselNubi, tama ba sabi ni galactus? Manual yung vehicle mo? pero sabi mo same symptoms as mine? did u also have a "check transmission" light flashing sa dash mo?

[attic_dude]

update lang guys, finally got the speedometer problem fixed. looks like it was the speed sensor nga, got one bnew for P2,200.00. haaay, now everything's back to normal na. meaning, i still have tio figure out whats causing the bighorn to downshift too soon. yung konting tapak lang downshift na siya, sometimes from 4th bigla siya mag shift to 2nd. kaso i dont know where to begin, kung sa fuel filters to or sa mga cables.

i do notice na in the mornings, pag hirap pa rin mag shift, kahit warmed up na yung engine, i press the pedal really hard often getting up to 3.5k rpm for it to shift tapos after that ok na. you think may bara lang yung mga filters kaya siya hirap mag shift?

[attic_dude]

bump ko lang to, baka someone can help me with this:

i still have to figure out whats causing the bighorn to downshift too soon. yung konting tapak lang downshift na siya, sometimes from 4th bigla siya mag shift to 2nd. kaso i dont know where to begin, kung sa fuel filters to or sa mga cables.

i do notice na in the mornings, pag hirap pa rin mag shift, kahit warmed up na yung engine, i press the pedal really hard often getting up to 3.5k rpm for it to shift tapos after that ok na. you think may bara lang yung mga filters kaya siya hirap mag shift?

[t2erns]

not familiar with your a/t but modern speedo are getting the pulses from the output speed sensor (check that out, poor contact, loose wiring, bad sensor,etc)). the proper operation of most modern a/t are comparing the speed signals between input and output sensors to determine the gear ratio ( this explains the erratic shifting) yun downshift sa 2nd could be a limp mode, the tcm will remove the power to the solenoids and the trans will operate purely on hydraulics (to prevent further damage) and so you can still drive the car for service

[landlord]

[QUOTE=Galactus;] I assume your ride is AT. I dont own an Isuzu, but I have an idea on what's causing your problem. The blinking LED on the dash is similar to Honda's blinking "D4" light. Since that sensor is dependent on the speedometer/ tachometer for shifting points, fixing the speedo will solve your problem.

Our 1996 Accord A/T has the same blinking D4 light problem and a non functioning speedometer. Where can we have it fixed other than sa casa? Madali lang ba ayusin to? Sa casa kasi mahal na, kung anu ano pa ang sinasabing sira other than the one you're complaining about. Yung shop sana preferably in the Paranaque-Las Pinas-Alabang area. Thanks in advance.

[Galactus]

Madali lang yan, any reputable shop in your area can replace the VSS (Vehicle Speed Sensor). AFAIK, its located near the tranny

Sa Banawe, mga 2k ang surplus, 4k+ ata ang brand new.

[attic_dude]

sorry for the very late reply, i kinda gave up na sa trooper namin until i saw this reply. i didn't know na may input and output sensors pala. i also noticed na you mentioned new A/Ts ours is old na 1996, i dunno if this solution will apply in our case. im still wondering how to fix this problem. i'm really losing hope, ilan years na ganito yung sasakyan namin.

not familiar with your a/t but modern speedo are getting the pulses from the output speed sensor (check that out, poor contact, loose wiring, bad sensor,etc)). the proper operation of most modern a/t are comparing the speed signals between input and output sensors to determine the gear ratio ( this explains the erratic shifting) yun downshift sa 2nd could be a limp mode, the tcm will remove the power to the solenoids and the trans will operate purely on hydraulics (to prevent further damage) and so you can still drive the car for service