boisebricks Posted October 4, 2011 Report Share Posted October 4, 2011 hi - I just had a headgasket replacement on my 99 V70. Car is all back together, has about 100 miles on the new gasket, so far it sounds really good - new cam lifters were installed, new gasket set, timing belt, and just about anything that may need to be replaced in the near future was. One issue that's been present though - I have a P1618 error with CEL light on. i checked all my wiring and sensors and they seem all good. Took it to my local volvo mechanic (who didn't do the HG replacement for cost reasons) and they said it looks like perhaps the TCU wasn't grounded when the far was first fired up, so it could have fried it. I've been reading about removing the ECU, special tool required, etc... but i can't find much on TCU removal. Does it require the same tool as the ECU? Thanks! john Link to comment Share on other sites More sharing options...
Dan A Posted October 5, 2011 Report Share Posted October 5, 2011 It's the same as the ecu. If you remove the sides of the plastic box it is possible to get them out without the tool. It's kind of a pain. Also, these are VIN coded so if you need a new one then you are going to have to go to a dealer anyway. But they pretty rarely go bad so I'd be surprised if that is the issue.Is that the only code present? Link to comment Share on other sites More sharing options...
boisebricks Posted October 5, 2011 Author Report Share Posted October 5, 2011 there was one for intake ambient air temp sensor failure and the front O2 sensor as well. i purchased one from the JY for 80 bucks and took it over to my local shop to install and see what we get out of the deal. i've retraced all the wiring and grounds as well as sensor conenctions, cleared the ECU by waiting 10 minutes, remove battery leads from battery, touch the leads together for 30 seconds, wait another 15 minutes, then reconnect the battery - no change. i also tried to clear the ECU by doing the same procedure with fuse 6 & 23 removed, no change as well as just remove fuse 6 & 23, tried to start the car (won't start - intentional), reinstall the fuses, then start the car up...no change the shop has also retraced the wiring, grounds and sensors as well. they're the ones that suggested the TCU swap. Link to comment Share on other sites More sharing options...
(n)A-GAME Posted October 5, 2011 Report Share Posted October 5, 2011 That would be the first time I've ever heard of a TCU going bad in 7 years on this site. Are there any symptoms you're having (other than CEL)? Link to comment Share on other sites More sharing options...
boisebricks Posted October 5, 2011 Author Report Share Posted October 5, 2011 when in drive, the car starts off in 3rd gearif i manually drop the car to L, no turbo... i think it's starting off in 2nd rather than 1st when i kick it into L - there wasn't enough torque to make it up my ramps to change the oil and it starts off pretty slugish - not like it's bogged down, just like it's in the wrong gear.winter drive "up arrow" is flashing continuouslyP1618 error code the car sounds great if only i could have it drive normal.... :blush: Link to comment Share on other sites More sharing options...
(n)A-GAME Posted October 5, 2011 Report Share Posted October 5, 2011 ETM is much more likely than a bad TCU box. Have you ever had the ETM serviced? Link to comment Share on other sites More sharing options...
boisebricks Posted October 5, 2011 Author Report Share Posted October 5, 2011 in the 4 years i've had the car, no ETM service. wouldn't the throttle be irregular or a code be generated if the ETM were bad? if i were to guess, i would think the shop checked it out - especially with such a common point of failure. Link to comment Share on other sites More sharing options...
(n)A-GAME Posted October 5, 2011 Report Share Posted October 5, 2011 ETM going bad can cause a host of issues including putting the car into Limp Mode which it sounds like you're experiencing now. Has it ever been serviced under the warranty, even before your ownership? Just trying to think of other solutions for you because the TCU replacement + reflashing Dan A mentioned will cost almost as much as the car is worth. Link to comment Share on other sites More sharing options...
boisebricks Posted October 5, 2011 Author Report Share Posted October 5, 2011 i located a TCU over at the JY and dropped it off at the shop to try a swap and see what the results are. the dealership said flashing the tcu is about $100. I don't know about the ETM - was there a recall on them or something where they'd be covered under warranty? if so, it sounds like they should be replaced regardless... it's definitely in limp mode. to me the grounding issue doesn't sound all that unlikely considering that about everything in the engine area was pulled out for the head gasket replacement. i paid a mere $300 for the job, so i could have gotten what i paid for .... but i couldn't justify a $3000 price tag for the repair when that was about what i paid for the car 4 years ago.... Link to comment Share on other sites More sharing options...
Dan A Posted October 5, 2011 Report Share Posted October 5, 2011 You are out of warranty on the ETM but I dont think thats your problem anyway. The TCU won't work without reprogramming. Most dealers that I've heard won't reflash a used TCU. Maybe yours will. Still I doubt it is the problem either. You might be better off getting diagnosed at the dealer instead of throwing parts at it. Wiring issues can be a bitch. Link to comment Share on other sites More sharing options...
(n)A-GAME Posted October 5, 2011 Report Share Posted October 5, 2011 When a local guy's ETM went out, he went into limp mode on the highway, stranding him there. One of the codes we pulled was the 1618 code, which is why I suggested it. Not sure what kind of TCU you pulled at a junkyard but like Dan A said it won't work. Link to comment Share on other sites More sharing options...
boisebricks Posted October 5, 2011 Author Report Share Posted October 5, 2011 hmmm- awesome. sounds like i'll just br drivin around in limp mode for a while then while i try to sort the biatch out.... Link to comment Share on other sites More sharing options...
Dan A Posted October 5, 2011 Report Share Posted October 5, 2011 When reading the symptoms about no power, etc. it could be ETM, but I don't think it is. I was thinking more along the lines of the input speed sensor on the transmission. I seem to remember other discussions with that code with that being the suspect. Don't remember what the results were though, but it's a possibility. Link to comment Share on other sites More sharing options...
boisebricks Posted October 5, 2011 Author Report Share Posted October 5, 2011 so that begs the question - where is the input speed sensor located along the transmission? i tried to find the different sensors along the trans, located the wheel speed sensors, but couldn't track down the speed sensor.... Link to comment Share on other sites More sharing options...
Dan A Posted October 6, 2011 Report Share Posted October 6, 2011 Funny, VADIS doesn't seem to show it. It's #10 in this diagram. http://www.volvopartswebstore.com/showAssembly.aspx?ukey_assembly=233738&ukey_product=1196282 Link to comment Share on other sites More sharing options...
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