Some puzzles for me and my 307

[ozfrog]

I've just had the top, front suspension mounts replaced, and a month before that, the alternator. I have recently enquired on here about the radio (in-car entertainment system*) not working, and despite, I believe, following the instructions given, it still doesn't. Some of this may be relevant.

After the suspension was repaired, I took the car for a 100 km round trip along a highway and returned via a B road. I discovered that the car doesn't like going up even moderate hills in 6th gear. The speed would drop from about 90 km/h to sometimes as low as 65 km/h. The speed limiter doesn't activate and the cruise control doesn't work. Those two must be related.

I cleared the previous faults and ran another Global test. Maybe I'm reading incorrectly, but as far as I can see, it's telling me the BSI has a fault
F000 which is Fault engine wiring housing : eCU mute on the CAN (Further down, F000 is described differently.)

There's also:
P1403 - 1 additional heating circuit (no further information as far as I can see)
U2003 - Reawakening of the ECU controlled remotely - this is described as intermittent and reawakening request not plausible
P1404 - 2 additional heating circuit - also intermittent; short circuit to earth; short circuit to positive; open circuit or actuator malfunction

Further down under Engine relay unit - BSM
F000 - Engine fuse box not communicating on the CAN fault

Finally, under Radio or radiotelephone (radio part) - ECU not recognised
F085 - No communication with the parking sensor ECU This car doesn't have parking sensors, front or rear! I've owned this car since 2014, I think, and this is the first time there's been any mention of parking sensors in Diagbox.

*Apparently cars don't have radios or audio systems or even sound systems any longer, at least in my part of Australia. We have In-Car Entertainment systems, or ICE for short. But ICE also means Internal Combustion Engine, as well as 'other' things. Context matters!

[mickthemaverick]

That is a pretty long list of codes!! Someone with more expertise than me is needed to make sense of that lot I'm afraid. However I believe that Diagbox does sometimes report 'ECU not recognised' when it means not found!!

[ozfrog]

That is a pretty long list of codes!!

I agree that it's a long list of codes, Mick.

However, I'm thinking (hoping?) that if the first issue - the BSI - could be sorted, then the others might fall into place and self-correct. I honestly don't know if that's likely of even possible, but I'm allowed to dream.

Otherwise, I don't even know where to start, other than taking the car to a Peugeot dealership. I don't trust my 'local' one, and my favourite nearby (3 hour e/way drive) has stopped selling Peugeot, according to its website. It is still listed on the Peugeot Australia website, strangely. Other than that, it's about a 6 hour drive to Melbourne, and I'll need to take a packed lunch with me for that one.

Cheers,
Andrew

[ozfrog]

F000 - Engine fuse box not communicating on the CAN fault

It has been suggested to me that the fuse box might need replacing. When I do a search online for my exact spec 307, I come up with many different part numbers for the fuse box. How do I know what the correct part number is? I can't find a part number on my existing fuse box. I admit that I'm probably looking in the wrong places, but anyway, having another reliable method of knowing the correct part number won't go astray.

Thanks for any advice.

[MattBLancs]

Sorry if a daft question but what sort of RPM is it pulling in 6th at those speeds?

I'm sure I've heard somewhere of the 6 speed 307 having quite long gearing (2000 rpm at 70 mph perhaps)
90 km/hour is only 56 mph,
65 km/hour is 41 mph,

If there gearings as long as I've read, it's far too slow to remain in 6th, especially if any kind of hill to climb

[MattBLancs]

Quick search to confirm I've not dreamt it!

https://www.peugeotforums.com/threads/5 ... 307.31987/

6 speed box has a very tall 6th gear and you need to be doing motorway speeds before its even worth using 6th it drops the revs too much to maintain progress below 70mph

if you watch the fuel computer at 70 mph you actually use less in 5th

And

If I remember correctly its a shade under 2k rpm at 70mph in 6th.

Under 2000 RPM at 70 mph / 112 km/hour! Very long gearing indeed!

Mine will pull in 6th from about 45-50mph no problem if yours wont until almost 70mph you have a problem. (or its not the 136 engine)

I'm surprised at that to be honest, my later 150 bhp HDi 308 also has quite long gearing (but more like 2300 rpm at 70 mph from memory, certainly not under 2000) but it's not happy being in 6th much below 50mph, not happy in 5th below 40 mph

[Rhothgar]

I've just had the top, front suspension mounts replaced, and a month before that, the alternator. I have recently enquired on here about the radio (in-car entertainment system*) not working, and despite, I believe, following the instructions given, it still doesn't. Some of this may be relevant.

After the suspension was repaired, I took the car for a 100 km round trip along a highway and returned via a B road. I discovered that the car doesn't like going up even moderate hills in 6th gear. The speed would drop from about 90 km/h to sometimes as low as 65 km/h. The speed limiter doesn't activate and the cruise control doesn't work. Those two must be related.

I cleared the previous faults and ran another Global test. Maybe I'm reading incorrectly, but as far as I can see, it's telling me the BSI has a fault
F000 which is Fault engine wiring housing : eCU mute on the CAN (Further down, F000 is described differently.)

There's also:
P1403 - 1 additional heating circuit (no further information as far as I can see)
U2003 - Reawakening of the ECU controlled remotely - this is described as intermittent and reawakening request not plausible
P1404 - 2 additional heating circuit - also intermittent; short circuit to earth; short circuit to positive; open circuit or actuator malfunction

Further down under Engine relay unit - BSM
F000 - Engine fuse box not communicating on the CAN fault

Finally, under Radio or radiotelephone (radio part) - ECU not recognised
F085 - No communication with the parking sensor ECU This car doesn't have parking sensors, front or rear! I've owned this car since 2014, I think, and this is the first time there's been any mention of parking sensors in Diagbox.

*Apparently cars don't have radios or audio systems or even sound systems any longer, at least in my part of Australia. We have In-Car Entertainment systems, or ICE for short. But ICE also means Internal Combustion Engine, as well as 'other' things. Context matters!

P1403 and P1404 relate to the addition water heating block on the bulkhead below the windscreen.

If you need if I can find the link to one of my recent posts about repairing mine. I had the codes for 3.5 years and only just got around to it in December 2025.

Basically, the first thing to check is the nut to the earth wire which should be a thick white wire connected to the back of the block. See if you can undo it with your fingers. If not, undo it, clean up mating faces and replace nut. A bit of threadlock wouldn't go amiss and don't go Neanderthal on tightening the nut as the stud is a small shank.

Next. If fault still exists, remove the rubber covers and carefully remove glowplugs. Clean up all surfaces. Test for continuity between threads and shank where nut screws onto. Replace any that are out of range. If you are the careful type, you can test the glowplugs across the battery but holding with a pair of pliers, applying to battery positive and a thick earth wire to the threads. I use 2.5mm 240V mains cable. The tip should glow red. DO NOT TOUCH! and put them somewhere sensible to cool down for a while afterwards. Even when they are not red they are still damned hot. You will only touch them once...

[mickthemaverick]

Further to Roger's test there when I used to test glow plugs I clipped onto the thread with a jump lead and used that clamp to hold the plug. Then clip the other end of the lead onto the negative battery terminal and touch the plug's terminal onto the positive battery terminal. That way you have no chance of the plug slipping out of your grip as it is a clamp rather than pliers.

[ozfrog]

Further to Roger's test

Roger?

Does Roger = Rhothgar and vice versa? Because I don't see anyone named Roger and that's the closest I can find.

[ozfrog]

Sorry if a daft question but what sort of RPM is it pulling in 6th at those speeds?

Not really daft, but you don't have a monopoly on that, anyway. I'm far more likely to be asking daft questions

I'm sure I've heard somewhere of the 6 speed 307 having quite long gearing (2000 rpm at 70 mph perhaps)
90 km/hour is only 56 mph,
65 km/hour is 41 mph,

If there gearings as long as I've read, it's far too slow to remain in 6th, especially if any kind of hill to climb

I began replying to this a day or so ago. My initial response was, ‘I have no idea!’.

But I took the car out for a quick drive last evening. I could not get the car to 100 km/h, and I was on a long and gentle downhill stretch of road. I'm going to do a calculation of that slope because it was the same one that I couldn't drive back up in any gear higher than 4th.

The fastest I was able to get the car moving according to the SatNav on my iPad (it sits in a mount and it has a direct view to the sky through the windscreen) was 85 km/h, and that was for a brief moment. I didn't have enough time to view the tacho. However, the car was sitting at 84 km/h for an ‘extended’ time. The engine was turning over at about 1400 RPM. The other thing I had brought back to me about this car is that the dashboard lights are not bright enough! I need to do something about them.

On the return journey (I'd gone only a few kilometres out of the town), I managed to drive most of it in 4th gear, but I was back to 2nd and about 4500 RPM, for some of it. Judging by the way they overtook me, the drivers of the cars behind me didn't seem to be impressed.

[mickthemaverick]

Further to Roger's test

Roger?

Does Roger = Rhothgar and vice versa? Because I don't see anyone named Roger and that's the closest I can find.

Indeed it does!

[ozfrog]

DO NOT TOUCH! and put them somewhere sensible to cool down for a while afterwards. Even when they are not red they are still damned hot. You will only touch them once...

Experience taught you this?

[ozfrog]

Further to Roger's test

Roger?

Does Roger = Rhothgar and vice versa? Because I don't see anyone named Roger and that's the closest I can find.

Indeed it does!

I could say ‘Roger that’, but the pun might not be appreciated.

Instead, I'll use the French word, merçi.

[Rhothgar]

Further to Roger's test there when I used to test glow plugs I clipped onto the thread with a jump lead and used that clamp to hold the plug. Then clip the other end of the lead onto the negative battery terminal and touch the plug's terminal onto the positive battery terminal. That way you have no chance of the plug slipping out of your grip as it is a clamp rather than pliers.

That is very sound advice!

[Rhothgar]

Further to Roger's test

Roger?

Does Roger = Rhothgar and vice versa? Because I don't see anyone named Roger and that's the closest I can find.

Rhothgar is a derivative of the Icelandic name Hroogar and Hrothgar was the King in Beowulf (which in past times had been spelled as I write it).

https://en.wikipedia.org/wiki/Beowulf

The name Roger derived from being someone famed with using a spear or a famous defender or warrior.

https://en.wiktionary.org/wiki/Hro%C3%BEgar#Old_English

There have been many famous Rogers in the last thousand years. It was a popular Templar / Crusader name. Many counts in the SW of France (Carcassonne / Pyrénées Ariégeoises region. Rogier is the French derivative.

And no, Rhothgar never made that error of judgement with glow plugs.