EDC16C34 FRP problem

**g5n14** · 12th April, 2020, 09:29 PM

Hello guys!
Have one very interesting car arrived to my shop.
Peugeoet 207 90hp 1.6HDi
Stoped starting, came by towing truck.
Makes strange noises (buzzer type) from Fuel Pressure Regulator which is on high pressure pump.

Errors in ECU - P0658, which is 5v sensor circuit voltage too low.

Checked everything:
Replaced fuel pressure regulator
Checked all the common wiring problem places, all looks good.
Changed ECU
Changed BSI
Disconnected all the components one by one, only while disconnecting the accelerator pedal p0658 is being replaced with some accelerator pedal signal too low.

Fuel Pressure Regulator is supplied after ignition is set to pos.2 with 12V from BSI, and being controlled from ECU by supplying PWM ground through some SOP-8 element, forgot the name already. When I measure signal coming from ECU (ground probe to FRP pin of ECU, V probe to + I get 8 volts while buzzing is present and 6 while trying to start, while should be approx 11-12). As a result 0 fuel comes to injectors. As soon as I supply manually good ground to ground pin of FRP everything is back to normal and fuel is supplied to injectors.

Once again, 2 different ECUs, same problem, so not the ECU 99%, what might be the problem? Once again, disconnected one by one each and every element and buzzing Is present all the time.

P.s. both ecus immo off by PSA EDC16 soft just to make sure.

Thanks to all who are trying to help!

**dehacko** · 13th April, 2020, 09:18 AM

hello, try julie emulator for immo off
sometimes edc16 is not possible immo off for flash and eeprom

**carmoh** · 13th April, 2020, 11:09 AM

Hello
did you try to change the engine compartment fuse box (BSM)

**g5n14** · 13th April, 2020, 12:10 PM

Dehacko

Thanks for your reply. You think immo is using pressure control map to cut start? I thought injector impulses are cuted off. +my FPR is buzzing like you can hear it 3m away from the car, rly loud, don’t think immo would do something like that. And I have a working pair eeprom +bsm, tried like that same shit, made immo off just in case.

**g5n14** · 13th April, 2020, 12:10 PM

Carmoh

Thanks for reply!
Yeah it’s written in the main post.

**carmoh** · 13th April, 2020, 12:27 PM

Hello
to my knowledge the immo problem only cuts off the injectors' impulse
I don't think an immo off will solve your problem
in the engine compartment there is a round central socket which connects the injectors opens this connector and checks

**goyodesanctis** · 13th April, 2020, 12:30 PM

Could you clone ecu by bdm and virgin bsi?

Enviado desde mi Mi A3 mediante Tapatalk

**janusz21** · 13th April, 2020, 12:41 PM

you disconnected egr

**g5n14** · 13th April, 2020, 01:03 PM

ECU is cloned. I don’t think virgin bsi is needed because Immo is not curing FRP signal. I have some problem that ECU controls the FRP in a wrong way, there is a poor grounding sent to FRP.

Janusz21, yeah I did, it was the first thing I have disconnected.

**g5n14** · 13th April, 2020, 01:09 PM

And once again. I don’t think it is immo problem, it is posted in ECU, nor immo nor chiptuning section of a forum. Compared the flash to ori - looks good, both eeproms from both ECU looks good and after that JUST IN CASE, I have done immo off.

The main question: what might cause the ECU to give poor ground (3.5 instead of 0 V) to FRP

**ricked** · 13th April, 2020, 01:42 PM

maibe stupid remark but did you check ground cable from chassis to motor?

i did replace a lot of these on citroen in the past....

**g5n14** · 13th April, 2020, 02:53 PM

Originally Posted by ricked

maibe stupid remark but did you check ground cable from chassis to motor?

i did replace a lot of these on citroen in the past....

Nothing stupid, real problem for all this cars. I run straight ground to ECU to make sure it’s not the problem, forgot to mention.

**g5n14** · 13th April, 2020, 03:25 PM

Just noticed a very strange thing.
I got the same ECU in my own Focus 1.6, so I have decided to test what’s up there.

All the measurements done by negative probe to FRP pin of ecu and positive probe to bat+12
After ignition on - 11.5 V comes there, so all good.
After ignition off +30sec it drops to 0

So all good, obviously, ford starts easily.

BUUUUT!!! The most interesting part, once i get the ecu off and go to test in table - same shit, 6.5 v once ignition on, so there is some kind of ground cable which should come to support this controlling SOP-8 element, will investigate now which one. If someone has any ideas - please post here. Thanks!

**janusz21** · 13th April, 2020, 04:34 PM

And the pressure sensor AC disconected

**g5n14** · 13th April, 2020, 05:05 PM

Yah that was the second one I disconnected 😂

Does anybody know if the car would start without gas pedal or with gas pedal broken?
Because I start to think that pedal is problem and because of safety algos the car doesn’t start.

So new question. What happenes If gas pedal breaks on the go? Car shuts down or goes to idle?