MAF

Questions specifically about a Diesel powered C3 (usually engine or fuel related problems)
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Diesel engine related problems
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My Name: rukadesigns

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Posts: 14
Joined: Sun Jan 14, 2018 10:05 pm
Model: C3 2002-2005, Original shape model
Year: 2004 (04)
Engine Size: 1.4 (16v)
Fuel Type: Diesel
Mileage: 200000
Trim Level: Exclusive
Gearbox: Manual 5 speed
DPF: No
LHD or RHD: LHD (Europe)
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Ok so i have installed a new maf and still not getting any air g/s values. Only value that is shown is the air intake temperature, the same value that was shown with the old maf sensor. Cleared errors in the ECU but they returned once i started the car and engine light is on. Any tips how to check values with multimeter in the 5 pins of the maf connector?

Best regards, Rui de Lima.
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My Name: Ozvtr

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Posts: 1253
Joined: Wed Jul 10, 2019 3:31 am
Model: C3 2002-2005, Original shape model
Year: 2003 (53)
Engine Size: 1.4 (8v)
Fuel Type: Petrol
Mileage: 80000
Trim Level: Other
Gearbox: Automatic PRND
DPF: No
LHD or RHD: RHD
Engine name: TU3 (75 PS)
Location: Brisbane, Australia.
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Wow, I've managed to find the worlds shitiest circuit diagram.

http://www.c3manuel.com/injection_allumage-151.html

Seeing as the airflow sensor and the temperature sensor are not making any sense I would say you are not getting any power to the MAF unit. The MAF appears to be item 1310 in the circuit diagrams. Pin 4 (I think it says pin4) seems to be the power pin. You can see it's power comes from the BSM but the fuse number is unreadable. See if there is power at pin4 (or any pin) with the engine running, if not check fuse and wiring to BSM. If there is power at pin4...well I don't know what to do then.
Hmm, item 1253 on the circuit diagram is your EGR valve, it shares power with the MAF. Pin 2 on the EGR valve is power. Is that the solenoid error code being that's being thrown up? Fuse at the BSM? Wiring from the BSM?
Coincidence? Problems with EGR and MAF? Cant win the lotto but..........
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My Name: C3CAR

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Posts: 2815
Joined: Wed May 04, 2011 10:01 am
Model: C3 2002-2005, Original shape model
Year: 2002 (02)
Engine Size: 1.4 (16v)
Fuel Type: Diesel
Mileage: 140000
Trim Level: Exclusive
Gearbox: Manual 5 speed
DPF: No
LHD or RHD: RHD (UK)
Engine name: DV4 16-valve diesel (90 PS)
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Ozvtr wrote: Sat Aug 17, 2019 7:55 pm Wow, I've managed to find the worlds shitiest circuit diagram.
I have some diagrams for the 16v 1.4 HDi 2002 C3 Diesel engine MAF to ECU wiring
1.4 HDi 16v C3 diesel MAF wiring diagram for 2002
1.4 HDi 16v C3 diesel MAF wiring diagram for 2002
C3 2002 1.4 16v diesel MAF wiring diagram
C3 2002 1.4 16v diesel MAF wiring diagram
My Name: rukadesigns

Contributor
Posts: 14
Joined: Sun Jan 14, 2018 10:05 pm
Model: C3 2002-2005, Original shape model
Year: 2004 (04)
Engine Size: 1.4 (16v)
Fuel Type: Diesel
Mileage: 200000
Trim Level: Exclusive
Gearbox: Manual 5 speed
DPF: No
LHD or RHD: LHD (Europe)
Has thanked: 1 time

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Hello all

One year later and im still having the same 0,0g air reading at the MAF. Ill have a week of holiday next in august and im willing to have a closer look to solve this problem. I want to track all the wires from the maf to the ECU, but i need some help.

Can someone confirm me which connector of the ECU (1, 2 or 3 from picture below) has the pins coming from the maf sensor? i couldnt figure out looking in the wiring diagram.

C3 ECU Plugs
C3 ECU Plugs
C3_ECU_PLUGS.jpeg (19.99 KiB) Viewed 296 times
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My Name: C3driver52

Guru
Posts: 2013
Joined: Sat Apr 30, 2011 7:40 pm
Model: C3 2002-2005, Original shape model
Year: 2003 (03)
Engine Size: 1.4 i
Fuel Type: Petrol
Mileage: 79984
Trim Level: VTR+
Gearbox: Manual 5 speed
DPF: No
LHD or RHD: RHD (UK)
Engine name: TU3 (75 PS)
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Pull the plugs and find the 48 way brown plug at the ECU.

It's shown on the diagram
Citroen C3 MAF to ECU wiring Diagram
Citroen C3 MAF to ECU wiring Diagram





1 and 3 on your picture are 32 way, the central one is the one you are looking for and that is the only 48way of the three.
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