restricted performance - throttle unit codes Topic is solved

dneu · Post by **dneu** » 16 Jul 2022, 10:51

My 2004 V70 R went to restricted performance after hitting a pothole. Scanner gave these codes : ECM 91A7, ECM 6814.. I have replaced the throttle unit, but the car still does not run and I got a new code ECM 9130. What i should look for? A next step? Thanks

Post by **jonesg** » 17 Jul 2022, 19:39

when dealerships change throttle body they often change the throttle harness with it to eliminate customer come backs,
once disturbed the plug has a habit of becoming intermittent. You can buy the harness separately for this reason.
Make sure it works with your R model.

https://www.fcpeuro.com/products/volvo- ... o-31409380

dneu · Post by **dneu** » 17 Jul 2022, 20:05

How difficult is to replace the harness? Does it go a gas pedal potenciometer?

Post by **br0dy519** » 17 Jul 2022, 20:26

I would verify the harness first. Do a continuity test between each wire on the plug end and the ECM end and make sure you have good contact. You will need the ECM removal tool or get crafty. This harness strictly does the throttle body, nothing else. No idea on difficulty, I've avoided doing this job as a troubleshooting method and came out lucky so far.

I'm trying to picture how a major bump could cause this. What exactly is happening with the car? Are you getting a no-start condition? Starts, sputters, and dies? Is there fuel at the rail? Is there spark? This basic information can really help us help you.

dneu · Post by **dneu** » 21 Jul 2022, 07:58

Problem solved: Installed new throttle module wasw not compatible with my 2004 V70 R although it was listed as compatible on a seller's page. I tested both - the old and new on the harness and observed a throtle when I turned ignition key on and depressed a gas pedal. The old module reacted to a pedal movement, the opened just a fraction of angle. I thoroughly cleand the old module, reinstalled it and the car runs like a new.

forestfarm · Post by **forestfarm** » 25 Jul 2022, 19:32

I had a similar problem years ago,when hitting pothole right front tire.would get reduced engine performance.After much screwing around with new throttle pedals and new throttle bodies it always eventually came back.Problem was way too simple,on the fender there are a series of 10 mm bolts securing the ecm ground wires,make sure yours are very tight .I searched the forum endlessly and never found a solution until finding a youtube video of a guy replacing the fender on his wifes car and experience same issues afterwards due to poor ground wire connection

maraschino · Post by **maraschino** » 30 Oct 2022, 23:26

forestfarm wrote: ↑25 Jul 2022, 19:32 I had a similar problem years ago,when hitting pothole right front tire.would get reduced engine performance.After much screwing around with new throttle pedals and new throttle bodies it always eventually came back.Problem was way too simple,on the fender there are a series of 10 mm bolts securing the ecm ground wires,make sure yours are very tight .I searched the forum endlessly and never found a solution until finding a youtube video of a guy replacing the fender on his wifes car and experience same issues afterwards due to poor ground wire connection

would it be too much to ask where those 10mm ECM ground wires are? like more specifically?

forestfarm · Post by **forestfarm** » 25 Aug 2023, 22:58

The car began to have same intermittent reduced engine performance fault codes.Finally changed the harness from throttle module to engine control module.So far,so good.Dealer quoted $2000 to replace harness and throttle body.Harness was $60 ,tool to remove ECM and TCM modules was $25.Took me 4 hrs.,first time.Took over an hour figure out how to carefully dissasemble the wire terminal block so that the wires were exposed enough to depress the retention lugs on each of the 6 wires that needed replacement.Just make sure that you have a wire diagram and an ohmmeter to confirm you have the right wire,as many wire colors are repeated in the harness.

Post by **jonesg** » 26 Aug 2023, 04:15

forestfarm wrote: ↑25 Aug 2023, 22:58 The car began to have same intermittent reduced engine performance fault codes.Finally changed the harness from throttle module to engine control module.So far,so good.Dealer quoted $2000 to replace harness and throttle body.Harness was $60 ,tool to remove ECM and TCM modules was $25.Took me 4 hrs.,first time.Took over an hour figure out how to carefully dissasemble the wire terminal block so that the wires were exposed enough to depress the retention lugs on each of the 6 wires that needed replacement.Just make sure that you have a wire diagram and an ohmmeter to confirm you have the right wire,as many wire colors are repeated in the harness.

sounds like a win, did you pull the intake ?