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01-19-2004, 09:31 AM | #1 | |
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Check Trans and Engine light (code P1870)
Hello,
I have 1997 Isuzu Rodeo (automatic, 4wd) and Check Engine and Check Trans. light is showing up. Trans. Light is flashing. Not sure what is wrong. Trans. gears seems to be switching fine. I took it to the mechanic and after inspecting he is getting code P1870 (component slippage). Is this something to worry about. I am planning to keep the truck for a while. Also how much the replacement cost? Thanks a lot. |
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01-19-2004, 10:26 AM | #2 | |
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Re: Check Trans and Engine light (code P1870)
Normally if the CEL and tranny light are on it means it has electrical problems. Either a battery on its last leg or more commonly the altenator is on its way out.
-Ryan |
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01-19-2004, 11:22 AM | #3 | |
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I would have a tranny shop familiar with the 4L30E pull the pan and check the tranny out ASAP. I'm not sure how the TCM determines the slippage, but it's ususally not a good sign with the 4L30E. Could be a weak solenoid, band, or maybe accumulator spring? Hopefully you can catch it in time & resolve the issue. These trannys dont hold up well at all if they are not maintained. ATF changes every 25Kmi, or sooner if you want to keep it forever. G/luck
Joel |
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01-20-2004, 06:27 PM | #4 | ||
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Re: Re: Check Trans and Engine light (code P1870)
Quote:
Heres my question. Would a loose serpentine belt cause the alternator to under generate power and under supply the transmission with adequate signal strenth? Also, if the alternator was under producing current wouldn't you notice it on any other instruments or the radio? John |
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01-20-2004, 06:35 PM | #5 | ||
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Re: Check Trans and Engine light (code P1870)
Quote:
My Rodeo has no physical indications of a transmission slippage. Everything changes gears fine. I have traveled 150 k non stop with the check tranny (P01870) light on. it wasn't on purpose. John |
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01-20-2004, 09:02 PM | #6 | |
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John- if your charging system is putting out 14V with the truck running, you do not have a charging system issue (battery or alternator). If your serpentine belt was slipping, you would also loose your power streering, a/c and cooling system fan / everything that runs off that single belt.
Joel |
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01-22-2004, 04:02 PM | #7 | ||
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Re: Check Trans and Engine light (code P1870)
Quote:
I took the truck to the dealer and he suggested to replace the transmission. Also gave me a huge estimate. Then I took the truck to another mechanic and he is driving since yesterday and didn't notice any problem with the trans. He is suggesting not to change the trans. and just drive until it gives any shifting problem. Currently according to the mechanice the check engine and trans light is also not showing up. Puneet |
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01-22-2004, 06:47 PM | #8 | ||
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Re: Check Trans and Engine light (code P1870)
Quote:
The reason I was thinking the serpentine belt was at fault is because I had the belt changed a couple of months ago. I had them order the belt, they said it would be ready in four days. Four days later I went to get the belt changed and they said they did not have it but they had one that was close. When they stretched my old belt and the new belt. The new belt was about a half inch longer. The said the tension pulley would take up the slack. It suddenly dawned on me after reading this thread that my old belt may have already been worn and stretched and comparing the sizes between old stretched belt and new would be inaccurate. Maybe there is not enough tension in the belt to prevent a random slippage. After the belt was changed the P01870 came on, but not immediately it takes a couple of days or 100 to 200 Kms before the light comes on after the codes are cleared. I'm thinking the lack of tension is not enough to affect the cooling system or other systems, but is enough to have the alternator under produce after a 100 kms. I am also finding the dealer inept and\or devious (I have already caught them lying twice). I find that the best way to figure this problem out is discussing this hear before I spend to have the tranny opened up. I appreciate your knowledge and help. John |
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01-31-2004, 10:28 PM | #9 | ||
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Re: Re: Check Trans and Engine light (code P1870)
Quote:
John Let me know how your making out with P01870 |
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02-05-2004, 10:37 AM | #10 | ||
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Re: Re: Re: Check Trans and Engine light (code P1870)
Quote:
Sorry for not replying earlier. Last week I took my truck to the local mechanic and there the light disappeared. He kept the truck for 2-3of days and didn’t see the light. He drove the truck and didn’t feel any slippage etc. He said he can put tranny for 1200 USD. But he suggested not to change tranny now since truck is running fine and there is no slippage problem. He said if the light show again, I should ignore it until I feel any slippage. Currently gears are shifting smoothly. Anyway this morning light came back. I don’t feel any performance problem so I am planning to drive for a while without getting transmission change. Will see how it goes. Thanks, Puneet |
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02-05-2004, 08:18 PM | #11 | |
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Re: Check Trans and Engine light (code P1870)
just reading this post dont change the tranny
first thing to do replace the filter then get the thing flushed. next disconnect both battery terminals touche the two together for 15 seconds reconnect both of them problem should be gone if it does come back all you need to replace is the torque convertor |
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02-05-2004, 08:30 PM | #12 | ||
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Re: Re: Check Trans and Engine light (code P1870)
Quote:
Really? Does this trick help to clear the tranny codes?
__________________
-Ryan Isuzu Moderator Car Show Tips Operations manager with a results-driven passion for process improvement FAQ 98-04 Isuzu Rodeo, Rodeo Sport, Amigo, Trooper SOLD - NOV2015 - 2000 Amigo, V6, HT winter, ST summer, 2wd |
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02-07-2004, 09:09 AM | #13 | |
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Re: Re: Check Trans and Engine light (code P1870)
I would assume that touching the two battery cables together would deplete the charge of any smaller batteries that were used for electronic memory storage, thus having the pcm to go to default settings. My question is what happens if you hold the cables together for longer than 15 seconds, could this cause permanent damage.
I check the Haynes manual for anything on torque converters and found next to nothing, does anyone know of any good internet resources on Isuzu torque converters. thanks for the info 2eyefishclaw John |
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02-07-2004, 12:03 PM | #14 | ||
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Re: Re: Check Trans and Engine light (code P1870)
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Thanks, Puneet |
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02-07-2004, 12:04 PM | #15 | |
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Re: Check Trans and Engine light (code P1870)
no harm will come to the PCM you could leave them together fo a year and you will not damage the PCM all your doing is discharging all electronic components it is not a quick fix for anything but a real good way to clear your dtc after you get the tranny flushed and it will also reset the PCM it may run funky for a while because all it goes through a learning process about 1,000 to 1,500 miles
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