Peugeot 207 GTi Aircon issue

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Ellold29
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Peugeot 207 GTi Aircon issue

Post by Ellold29 »

So my thp175 has developed a fault with the a/c. I have 3 dtc codes
F994: fault in a/c compressor clutch control
F995: fault in a/c compressor variable control circuit
715c : a/c pressure information

I have replaced compressor and condensor, have had the system regassed correctly with a 30 minute vacuum. There is no leak in the system.
I started by replacing the pressure sensor and fault still there. I checked wiring , I get 14v down to the compressor. I used a power probe on compressor and the clutch engages.
I then sent ecu off thinking it's at fault, however came back with no faults with the ecu.
Would the BSI be at fault or the BSM??
Also is it worth just having the engine running and use the power probe to jump start the compressor?

Any help really appreciated as at a lose of what to do next. Thanks

RichardW
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Re: Peugeot 207 GTi Aircon issue

Post by RichardW »

What are you using to get the codes? You need to see the live data to see what is going on, which really needs Diagbox. I remember someone having trouble with AC which was cured by taking the battery off and letting the BSI restart properly.

Ellold29
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Re: Peugeot 207 GTi Aircon issue

Post by Ellold29 »

So I am using autel. Watching live data the compressor is "activated" however it's reading invalid pressure in the system, hence why I swapped pressure sensor. But again that did nothing so thought the data wasn't going in to th ecu to th bsi. But ecu has now been eliminated

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wheeler
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Re: Peugeot 207 GTi Aircon issue

Post by wheeler »

Are you getting an earth at the compressor?
Im a bit confused, you say your getting 14v at the compressor but the clutch wont engage? If you use a power probe on the compressor the clutch engages? Surely that would mean no earth at the compressor or am i reading this wrong?

Ellold29
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Re: Peugeot 207 GTi Aircon issue

Post by Ellold29 »

Tbh that's what I've been thinking , but also wether the relay in the bsi is a earth switched relay or is it live switch relay?

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mickthemaverick
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Re: Peugeot 207 GTi Aircon issue

Post by mickthemaverick »

Reading 14V at the compressor does not necessarily mean that the normal supply circuit is giving enough current to engage the clutch. Voltage readings can be misleading because the voltage will be the same whether read from a low or high resistance load. As the clutch works when you apply direct power to it I would be looking through the connectors, relays and fuses in the supply circuit. The tester will say it has activated the clutch because it believes it has connected the circuit but from the source end it cannot tell whether you have a decent supply at the clutch. Go through all the links in that supply circuit, my guess is you will find an HR (high resistance) joint somewhere which allows the voltage to be reflected through but will not pass sufficient current to operate the clutch. :)

Ellold29
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Re: Peugeot 207 GTi Aircon issue

Post by Ellold29 »

Okay I shall retest for continuing from compressor connector to ecu. Are you able to show me a wiring diagram from compressor to ecu or the wire numbers? Thanks :)

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xantia_v6
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Re: Peugeot 207 GTi Aircon issue

Post by xantia_v6 »

Also be aware that the engine ECU can disable the compressor if it detects an abnormality in the cooling system, for example a detected fault in the thermostat heater will cause the engine ECU to disable the A/C compressor.

Ellold29
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Re: Peugeot 207 GTi Aircon issue

Post by Ellold29 »

I've already had a new thermostat and temp sensor fitted, and no codes are stored relating to thermostat 🤙🏻

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wheeler
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Re: Peugeot 207 GTi Aircon issue

Post by wheeler »

Ellold29 wrote:
19 Feb 2021, 07:01
Are you able to show me a wiring diagram from compressor to ecu or the wire numbers? Thanks :)
What are the last 8 digits of the VIN?
Is it automatic temperature control or regular A/C?

Ellold29
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Re: Peugeot 207 GTi Aircon issue

Post by Ellold29 »

Just an update.
I went to Peugeot and asked for wiring diagram, they also have me a spare fuse box to try with a fault but not related to air con. Tried this fuse box and issue still pursuing. I have used the wiring diagram and checked continuity between both Earths and lives between compressor and fuse box, all good. I then checked between fuse box and bsi again all good.
Having already had ecu tested and swapped a fuse box over I'm going to send the bsi to be tested as that's all that hasn't been checked out of the whole air con system.

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Re: Peugeot 207 GTi Aircon issue

Post by wheeler »

If you fit a 2 pin head lamp bulb in place of the compressor does it illuminate when you switch the A/C on with the engine running?
From what you are saying you have a power supply & earth at the compressor which if im reading you right suggests the control side of things is ok?
The BSI probably has very little to do with the A/C operation.

Ellold29
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Re: Peugeot 207 GTi Aircon issue

Post by Ellold29 »

Reading the wiring diagram from Peugeot, the pressure sensor goes through same wiring as injectors, EPs then in to bsi. Compressor goes to fuse box which I've checked and swapped over. Control unit when watching live data shows it turns on and off when pressed.
Ecu has been tested and no fault. On my other wiring diagram I got from a Peugeot specialist it showed the pressure sensor goes in to ecu and then to bsi. However the one from Peugeot main dealer shows different so I must of had the wrong diagram.
The main fault I'm going with is that the bsi is not picking up on th pressure sensor causing the rest of the system not to kick in.
So with all that information and checking I'm thinking bsi is the main source of the functioning of the Aircon