P2670 & P2671 - where's the earthing for 5v circuit?
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P2670 & P2671 - where's the earthing for 5v circuit?
Hi all. Car is 2011 308 SW 2.0HDI. I've got an engine light on and aircon has stopped working (compressor clutch doesn't engage). I scanned for codes and I'm getting a host of sensor error codes which I'm guessing all share the same 5v supply: aircon pressure sensor, DPF pressure sensor, turbo repeat sensor to name a few. I also get P2670 and P2671 which state "5v supply voltage too low" and "too high" respectively. I have rashly replaced a few sensors as well as the Delphi DCM 3.4 engine ECU with a cloned one after following advice from a local garage, but this didn't do anything. I am thinking it could be the earth for this 5v supply but I have no idea where it is located to check it and clean it in the hope this might solve the issue. Can anyone offer me some advice on this issue and/or the location of the earth point? Thanks in advance. Cheers ![🥂](//cdn.jsdelivr.net/gh/twitter/twemoji@latest/assets/svg/1f942.svg)
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Re: P2670 & P2671 - where's the earthing for 5v circuit?
You'll need to provide your VIN first. Please post your VIN in full without spaces - it will be automatically masked from public view after submitting your post & will only be visible to staff.
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Marc
Marc
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Re: P2670 & P2671 - where's the earthing for 5v circuit?
Hi. Thanks for your reply. VIN is VF3**************[VIN obfuscated, can be read by forum staff]. Thanks!
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Re: P2670 & P2671 - where's the earthing for 5v circuit?
Fault Code: | P2670 |
Description of Fault: | Supply of sensors 5 Volts n°2: Voltage too low. Voltage supply to the sensors is lower than 4,7 V for more than 5 seconds (Turbocharging pressure sensor; Air flow meter sensor; Particle emission filter pressure sensor; Turbocharger position copy sensor; EGR valve position repeat sensor; Air conditioning pressure sensor). |
Conditions for Fault to clear: |
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Downgrade Modes whilst Fault is active: |
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Suspect Areas: |
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Fault Code: | P2671 |
Description of Fault: | Supply of sensors 5 Volts n°2: Voltage too high. The sensors supply voltage is higher than 5,25 V for more than 120 milliseconds (Turbocharging pressure sensor; Air flow meter sensor; Particle emission filter pressure sensor; Turbocharger position copy sensor; EGR valve position repeat sensor; Air conditioning pressure sensor). |
Conditions for Fault to clear: |
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Downgrade Modes whilst Fault is active: |
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Symptoms: |
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Suspect Areas: |
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So here's the injection wiring diagram for your specific vehicle with this engine ECU:
With the exception of the wiring codes, most of the component codes are indexed here:
PSA Electrical Diagrams - Wiring & Symbols Codes Index
From the looks of things all these relevant sensor connections, including the earths go back to the engine ECU itself, so it may be one of the earths from the ECU itself.
MC10 and MC12 should therefore be looked at. The first diagram shows the earthing points on the vehicle. But as both of these earths from the engine ECU in question are connected to the 48 min maroon wiring connector, I would also check the quality of the pins and wiring of the actual plug itself, as this won't be the first time there has been loose pins / wiring to the pins on the connectors.....
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Marc
Marc
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Re: P2670 & P2671 - where's the earthing for 5v circuit?
Hi Marc, thanks so much for all this info. It is mega helpful for me. I will have a poke around this weekend and see what gives and let you know how I get on. Thanks again! Winston. ![👍](//cdn.jsdelivr.net/gh/twitter/twemoji@latest/assets/svg/1f44d.svg)
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Re: P2670 & P2671 - where's the earthing for 5v circuit?
No problem, good hunting!
Please Don't PM Me For Technical Help
Marc
Marc