O2 sensor connections swapped what happens when upstream for down, and down up?

ksanturion10 · Post by **ksanturion10** » 15 Sep 2020, 10:10

So you have putted a Sagem coil pack over a Bosch ECM system - nice

Ashley · Post by **Ashley** » 18 Jul 2022, 08:59

Hi Guys,

I want to know the wiring color of the upstream and downstream oxygen sensor from its plug to the ECU on a picasso xsara 1.6 petrol sohc engine year 2003 because for my car the upstream and downstream plug color are both green. If somebody can help me as i dont want to swap its by error.

Thanks

Post by **GiveMeABreak** » 18 Jul 2022, 10:07

1351 is the downstream sensor
1350 is the upstream sensor

Ignore wiring colours, focus on pin numbers:

Ashley · Post by **Ashley** » 19 Jul 2022, 04:43

I focus on wiring color because i cannot found the pin number.

Post by **Paul-R** » 19 Jul 2022, 09:52

The problem is that the colour can, and often does, change as you follow it through a wiring loom. You cannot even guarantee that it will start with the same colour in a different loom. You will have to find the codes - they are normally at the very ends of the cable run when the cables finish in a plug of some kind.

Which Port Louis are you from? Can I suggest you put more information in your location in case this affects any advice we can give?

Post by **GiveMeABreak** » 19 Jul 2022, 10:41

Ashley wrote: ↑19 Jul 2022, 04:43 I focus on wiring color because i cannot found the pin number.

The pins numbers are marked at the plug connection. The same for the ECU plug. You will need to look for the markings, but these may be hard to see as they are the same colour as the plug. The sensor cables them selves should be 2 different lengths - a longer one for the downstream and a shorter one for the upstream.

Ashley · Post by **Ashley** » 19 Jul 2022, 14:51

Check it and i do not found any number on it

Post by **GiveMeABreak** » 19 Jul 2022, 15:05

The pins are shown where I have arrowed below. The wiring codes are on the wires on the sleeves. You may have to peel back the protective sheathing to show the codes - they are printed every few inches on each wire.

Click or tap Image to zoom

So you can see on the green plug, pins marked 1, 2, 3 & 4 which correspond the same numbers on my wiring diagram.

Ashley · Post by **Ashley** » 19 Jul 2022, 15:06

I checked the wiring and i found one wiring with number 1302 and next to it another wire with number 44DN and according to the wiring diagram you sent to me number 44DN do not include in it. But i guess it is the downstreaming wiring with the number 1302 am i right?

Post by **GiveMeABreak** » 19 Jul 2022, 15:09

44DN is not a code - ignore it.

1302 is shown on my wiring diagram if you look. 1351 (hardware) is the downstream sensor which shows wire 1302 connected so yes.

Ashley · Post by **Ashley** » 20 Jul 2022, 14:43

Thanks for the info. Another question, do you have the wiring diagram for the idle valve for my engine

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O2 sensor connections swapped what happens when upstream for down, and down up?

Re: O2 sensor connections swapped what happens when upstream for down, and down up?

Re: O2 sensor connections swapped what happens when upstream for down, and down up?

Re: O2 sensor connections swapped what happens when upstream for down, and down up?

Re: O2 sensor connections swapped what happens when upstream for down, and down up?

Re: O2 sensor connections swapped what happens when upstream for down, and down up?

Re: O2 sensor connections swapped what happens when upstream for down, and down up?

Re: O2 sensor connections swapped what happens when upstream for down, and down up?

Re: O2 sensor connections swapped what happens when upstream for down, and down up?

Re: O2 sensor connections swapped what happens when upstream for down, and down up?

Re: O2 sensor connections swapped what happens when upstream for down, and down up?

Re: O2 sensor connections swapped what happens when upstream for down, and down up?