B132A : Air conditioning circuit low pressure safety fault

[frer8833]

I left the car at another mechanic now. I told him the error is Radiator fan wiring open/shorted circuit. Service light turns on, Engine Fault flashes on display, horsepower is reduced to reduce heat output and that it means radiator fan can not spin because no electricity arrives to it from the fuse box. AC does not work because it needs the engine fan to run first. He said it is the other way around that engine fan will run when AC works (even though I told him it can't because of wire fault according to scanner). If AC is the original problem why didn't my Kingbolen scanner get any AC related error codes like low pressor, engagement clutch error etc? I hope he at least checks the Radiator Fan cable and knows what he is doing.

[ozvtr]

Sorry I'm not familiar with your C5 or diesels...sorry.
No that's the BSM which is labeled PSF1 in the circuit diagram. You are looking for the fuse box that's labeled '1032' in the circuit diagram.
It think its called called the Supply Protection and Management Unit (SPMU) and I think it's sitting on the battery?

Fuse F2, in the BSM, powers the relays. There are 2 sets of power. 1 for the controller (relays) and one for the actual fan. The power for the fan comes from this SPMU fuse F5.

If it's just a blown fuse, don't let this mechanic con you! It's possible the old fan blew the fuse?

[frer8833]

Is what you call "F5" actually what is called "FL12 (60A) Cooling fan motor", on top of battery (SPMU), (no F5 is mentioned in the list)? https://car-box.info/citroen/c4/b7-2011-2018.html





I'm not sure which one is FL12 (F5?) nor sure how to remove the black box lid to see the fuses. From left the fourth brown fuse looks like a cable-less dummy. I guess I can test every 60A fuse. Is the fuse testable with a simple 12-24 circuit tester? Where do I buy the replacement fuse? What is the procedure to change one of these SPMU fuses, is it possible without disconnecting the battery while engine is turned off?

I guess this Bolt-On littlefuse can be a replacement, 60A costs €4 in local car parts shop.

[ozvtr]

I'm not sure that picture aligns with your car, but yes, that's the sort of thing you would be looking for.
You would just test for +12V on BOTH sides of the fuse. If you only got 12V on one side, the fuse would be blown.
60amps is a fair bit of current. If the fuse is Ok I would open up the 2 pin grey connector at the fan housing and look for melted contacts.

[frer8833]

That drawn diagram above of a battery box with FL-fuses as you said doesn't seem to align with the real picture of the uncovered real battery fuse box. Can someone paste here the real diagram so I can know which fuse is for the Cooling Fan (F5)?

I pasted below another real picture where the brown fuse is not a dummy, it has a 70A fuse and a cable. I wonder why the picture above from car-box.info has no cable, what if that also happens to be the Cooling Fan's fuse? 12v70a=840watts, that's too much for a cooling fan, maybe it is designed to also be able to give power for other external stuff like camping equipment, is there power in the cable even when engine is off and start-key position is zero?



In this picture there is no fuse at all at fourth place from left:


I'll probably next week check the fuses.

[ozvtr]

Hmm. The the naming convention of the fuses got me thinking.
The fuseable links are labeled 'FL' in circuit diagrams BUT replaceable fuses are labeled 'F'.
I found 2 replaceable fuses in that picture.

One of those may be the fuse you are looking for. See if "F5" is molded into the plastic. I cant see. The brown one appears to be F2 but I can't make out the yellow one.

[frer8833]

According to the diagram they are fuses "1" and "2" and they have no described function, I wonder why they have a cable attached? They also look different than the Bolt-On fuses, they are maybe Maxi-fuses. On top of the black lid of the brown fuse it is written "M093". On its cable RBK-1.

Actually I think this diagram which shows FL-fuses is not even for C4 II B7 2013 (my car), I think it is showing fuse box for another model which is 2008 CITROEN C4 GRAND PICASSO MK1 2006 - 2013 1.6 HDI DIESEL (I will ask now Car-Box.info to provide the right diagram):

I think this is my car's battery fuse box, on the yellow fuse it reads "20" (amp?) and on the brown one "5" (amp) but I dont think "5" means F5 (Engine Cooling Fan) but it may still be F5 because we don't have the real diagram. Are these regular small fuses or MAXI-fuses?:


When I look at the wiring diagram provided by

it looks like "F5" is outside of the battery (PSF1) fuse box and BSI1 fuse box, so maybe I should be looking somewhere else?

[GiveMeABreak]

Fuse F5 on the diagram I provided is NOT in the engine fusebox. The Engine Fusebox is PSF1.

Fuse F5 in 1032 is the Electrical Supplies Protection and Management Unit and supplies power to the 2-speed cooling fan electrical control unit (1522).

[frer8833]

How can I find or access the ESPMU (Electrical Supplies Protection and Management Unit) in the car, is there a real or drawn picture of it for Citroen C4 (B7) or for other car model (to get an idea)? What does 'permanent/cpc' signify in "F5, 60A, Supply: Permanent", is it an irreplaceable fuse?

I quality checked both fuse F2 and F5 (engine cooling fan) in this diagram of BSI1 but I realize it is not the same "F5" which you are talking about because these are much lower in amperage:

Your diagram shows that there is a direct wire which goes from "6" in the SPF1 fuse box on the battery to pin "3" on the power outlet socket for electric cable of the Radiator Cooling Fan. Which fuse is "6" and is it something to worry about in regards to p0495/p0494 cooling fan error code?:

[ozvtr]

Your diagram shows that there is a direct wire which goes from "6" in the SPF1 fuse box on the battery to pin "3" on the power outlet socket for electric cable of the Radiator Cooling Fan. Which fuse is "6" and is it something to worry about in regards to p0495/p0494 cooling fan error code?:

No. That's only power for the RELAYS of the radiator fan. NOT power TO the fan motor. The engine ECU is NOT monitoring that circuit. So even if that fuse blows, the engine ECU won't know it and won't throw up a code.
One relay selects low speed, the other selects high speed. But they are only switching the power from F5 in the SPMU.

[darbuck]

From looking at the pictures they are fusible links as opposed to actual fuses slightly different but same idea. They are colour coded the same as conventional fuses i.e blue 15a brown 5a and pink 10a . they are listed on eBay and Amazon as midi fuses. It sounds like a either a broken cable or possibly a relay. But you say you have changed the relay, have you checked for continuity between the fan/relay and the fuse box. If not you need to trace the circuit to check for it and then check for power at the fan. If it is all good look at your coolant temperature sensor. It is what turns on the radiator fan it operates like a switch. Older mechanics call them fan switches. It reaches temperature and closes the circuit allowing the fan to run. A bad air intake temp sensor can sometimes cause it as well because they can share the same circuit. Check all your temperature sensors are within spec. If all of the above is good you are possibly looking at a bad control module.

[frer8833]

Is there a guide or image which shows where is the coolant or air intake temperature sensor and how to change it or disconnect it so I can apply contact cleaner? Is it probable that it can solve it? If they are dirty or broken would that maybe not instead make the fan run at 100%? Maybe the fan cable is broken so that's why it despite that can not run at 100%? Two problems in that case.

On another forum it is described as "If the cooling fan RPM is to high when the PCM is commanding 0%, DTC P0495 will set." I still wonder why the error code is p0495 because that code is for too high fan speed but the fan actually has no fan speed at all. Maybe it was going to get a very high speed but the ECU stopped the electricity to avoid that from happening? BTW the OBD2 scanner also shows the error code p0494 sometimes which is for too low fan speed.

Except checking for a faulty ECU, PCM (Powertrain Control Module), is there also a Fan Control Module (FCM)? Are they easy to replace?

Would there normally be more error codes if the temperature sensors have a fault?

The previous mechanic who said it's caused by AC didn't even check the car, he parked it and said the next day that he will check the car in next week so I went and took my car.

[ozvtr]

Is there a guide or image which shows where is the coolant or air intake temperature sensor and how to change it or disconnect it so I can apply contact cleaner? Is it probable that it can solve it? If they are dirty or broken would that maybe not instead make the fan run at 100%?

The temperature display on the dash would show an over heating condition. You mentioned nothing of that.

On another forum it is described as "If the cooling fan RPM is to high when the PCM is commanding 0%, DTC P0495 will set." I still wonder why the error code is p0495 because that code is for too high fan speed but the fan actually has no fan speed at all. Maybe it was going to get a very high speed but the ECU stopped the electricity to avoid that from happening? BTW the OBD2 scanner also shows the error code p0494 sometimes which is for too low fan speed.

Your car does not have an electronic speed controller and so cannot tell the speed of the fans. Only if there is power and the state of the two relays.

is there also a Fan Control Module (FCM)? Are they easy to replace?

Yes, its labeled 1522 in the circuit diagram. But you said you replaced the fan assembly. I would have assumed that the fan assembly came with a new relay pack as it sits in the fan shroud. And you did not mention having to change any bits from one to the other.

[Flowone]

Hi ive got one question please, my Peugeot 208 gti 2013 have the code b132a, and my engine estart for like 3 second and cut off strait away any reason for this please. there is no other code showing or lights on the dash board

[darbuck]

The A/C signal wouldn't cause a no start anyway so you can rule that out. If you can get some live data while cranking it might help. Coolant temperature, fuel pressure if you can see it, cam crank sync battery voltage, is it petrol or diesel.