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Engine System Service Urgent, from bad to worse

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oragex
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Re: Engine System Service Urgent, from bad to worse

Post by oragex »

Looks like a similar issue (see last post) viewtopic.php?t=71635
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Re: Engine System Service Urgent, from bad to worse

Post by SuperHerman »

I am not very proficient in VIDA, but the software is very powerful and will provide the answers.- at least a fault trace path to go through. There are numerous videos on the internet - pick one that goes through the steps, it doesn't have to be for your problem, but it will show you how it works and how to navigate the interface. Good luck.
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Re: Engine System Service Urgent, from bad to worse

Post by SVO LOU »

oragex wrote: Mon Jan 06, 2020 7:27 pm Looks like a similar issue (see last post) viewtopic.php?t=71635
As I scrolled the post my hopes were growing and growing until I read his solution...My fuse is in place, and tests good.
Thanks for the heads up.
Didn't have anything to lose so I tried the accelerator pedal assy from the donor and it didn't make a difference. :(
I let it idle, hooked up VIDA again and the same codes showed up, and clearing still doesn't help.
Thanks for the help everyone.
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Re: Engine System Service Urgent, from bad to worse

Post by SuperHerman »

Not the fuse, but the relay was what failed. Did you check the relay?
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Re: Engine System Service Urgent, from bad to worse

Post by SVO LOU »

SuperHerman wrote: Tue Jan 07, 2020 7:52 pm Not the fuse, but the relay was what failed. Did you check the relay?
Didn't check a relay, had to button it up, clean up, and make dinner. Looks like the FMI1 relay is the next step. Thanks.
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Re: Engine System Service Urgent, from bad to worse

Post by SVO LOU »

Tried the relay today although I didn't have the FMI1 relay, so I replaced the one that was where FMI1 would've been, and the bottom side of the fuse cover said AC, and it made no difference. Maybe that's not the relay you meant, though, Superherman.
I'd really like to un-seat the ECU and take a look at the pins but I don't have that special ecu tool. Under communications>ECM I get
ECM-Accelerator pedal sensor, PWM 0%
ECM-Accelerator pedal, PWM (via ETM) 0%
Both of the above show no change when I press on the pedal but these do...
ECM-throttle angle
ECM-Accelerator pedal, analogue input
Last edited by SVO LOU on Wed Jan 08, 2020 7:14 pm, edited 1 time in total.
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Re: Engine System Service Urgent, from bad to worse

Post by volvolugnut »

The ECU or TCU removal tool is available as loaner here on MVS.
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Re: Engine System Service Urgent, from bad to worse

Post by SuperHerman »

I don't have VIDA anymore so I cannot provide guidance on which relay you are looking for. Was it in the rear of the car or the front? There is suppose to be a relay there - so you may still need further testing.

Maybe RickHaleParker will chime in and point you to the correct relay and its location.

Can you link a picture of the relevant wiring diagram?
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Re: Engine System Service Urgent, from bad to worse

Post by firstv70volvo »

SVO LOU wrote: Wed Jan 08, 2020 6:41 pm Tried the relay today although I didn't have the FMI1 relay, so I replaced the one that was where FMI1 would've been, and the bottom side of the fuse cover said AC, and it made no difference. Maybe that's not the relay you meant, though, Superherman.
I'd really like to un-seat the ECU and take a look at the pins but I don't have that special ecu tool. Under communications>ECM I get
ECM-Accelerator pedal sensor, PWM 0%
ECM-Accelerator pedal, PWM (via ETM) 0%
Both of the above show no change when I press on the pedal but these do...
ECM-throttle angle
ECM-Accelerator pedal, analogue input
From the 2002 document I have the power path to the accelerator pedal sensor does not go through the FMI1 relay, this relay is for the AC solenoid but does share the same 11B/8 fuse as the pedal sensor. Does your AC work? Please see the attached file for power path to the pedal sensor.
Attachments
Accelerator pedal debug.pdf
(460.54 KiB) Downloaded 59 times
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Re: Engine System Service Urgent, from bad to worse

Post by SVO LOU »

Thanks for the help guys, especially the pdf.
Yes, the ac works fine, and this is an '01 but hopefully the same as an '02. The relay I changed was in the engine compartment fuse panel, I'm somewhat experienced with wiring diagrams so I'll look deeper.
Thanks again.
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