Mass airflow sensor wiring

[LukahJ]

Hiya, so im in the process of trying to rewire my MAF sensor as a scan came up as it reading -40 degrees for the temp of the air but i cannot find a wiring diagram for a VZ commodore 2004 for the life of me!!!! Suspecting the wiring is incorrect as someone has already tampered with it and leading me to believe that the incorrect temperature reading is the backwards wiring. Please someone help haha

 

[krusing]

Does the MAF Wiring look damaged?
IF not, don't fix what isnt broken.
Its possibly not the MAF Sensor Temperature.

That same error can be indicated from the Temp Sender on the front of Condenser,
The same "Ambiant Air Temperature Sensor" is used for the Climent Control O/S Temperature,
(Which I have found is approx. 2deg out, I replaced the same sensor and they both read the same, as they indicates 2 deg higher that what is actually is outside)

Possible replace that, and that may fix your issue.

Edit: Check to see if its actually there, and/or if its plugged in.

 

[krusing]

"as someone has already tampered with it and leading me to believe that the incorrect temperature reading is the backwards wiring".

I would say, that someone had NFI what they were looking for, and/or how to fix it.

 

[LukahJ]

Does the MAF Wiring look damaged?
IF not, don't fix what isnt broken.
Its possibly not the MAF Sensor Temperature.

That same error can be indicated from the Temp Sender on the front of Condenser,
The same "Ambiant Air Temperature Sensor" is used for the Climent Control O/S Temperature,
(Which I have found is approx. 2deg out, I replaced the same sensor and they both read the same, as they indicates 2 deg higher that what is actually is outside)

Possible replace that, and that may fix your issue.

Edit: Check to see if its actually there, and/or plugged in.

View attachment 249420

 

[LukahJ]

Does the MAF Wiring look damaged?
IF not, don't fix what isnt broken.
Its possibly not the MAF Sensor Temperature.

That same error can be indicated from the Temp Sender on the front of Condenser,
The same "Ambiant Air Temperature Sensor" is used for the Climent Control O/S Temperature,
(Which I have found is approx. 2deg out, I replaced the same sensor and they both read the same, as they indicates 2 deg higher that what is actually is outside)

Possible replace that, and that may fix your issue.

Edit: Check to see if its actually there, and/or plugged in.

View attachment 249420

The MAF has definitely been tampered with as with the ac pressure sensor too, Seems to be that someone has crimped and connected the AC refridgerant pressure sensor to a wire connecting to the MAF connector wiring. This is the current wiring. Ive replaced the MAF thinking it was faulty and then soldered the connecting wires back onto the connector as it wasnt connect on properly. All of that has made no difference as when the car is running i can pull out the MAF and it will not change idle or the quality of the engines preformance.

 

[krusing]

If they have been joined to the same color wiring, it should be ok,
As for the AC wiring, not sure on that,
Maybe download the Service manual (on PC) and look at the wiring diagrams, they indicate the correct colors of what wires are connected were,
The AC wire may well be connected to it to send a signal to the ECU to raise the idle speed when the AC Compressor kicks in.

If it doesn't make any difference to idling, but does it trigger a DTC?, and activate the MIL come on ?

As NOT ALL DTC's activate the MIL.

 

[krusing]

I meant to ask,
What was the DTC/s that was recorded?
Without knowing that/them, its anyone guess,
and like looking for a needle in a haystack,
Thats like loading up the parts cannon.

 

[LukahJ]

If they have been joined to the same color wiring, it should be ok,
As for the AC wiring, not sure on that,
Maybe download the Service manual (on PC) and look at the wiring diagrams, they indicate the correct colors of what wires are connected were,
The AC wire may well be connected to it to send a signal to the ECU to raise the idle speed when the AC Compressor kicks in.

If it doesn't make any difference to idling, but does the MIL come on ?, and trigger a DTC?

Sorry im still learning as im fixing this issue haha, what is MIL? and i somewhat know what DTC is; as in the signal to the body control module? i may be completely wrong. But thats very true that the AC pressure sensor wiring might be connecting to the MAF wiring, but i would be concerned that maybe the crimp on that specific wire doesnt look factory.

 

[LukahJ]

I meant to ask,
What was the DTC/s that was recorded?
Without knowing that/them, its anyone guess,
and like looking for a needle in a haystack,
Thats like loading up the parts cannon.

Sorry, The DTCs are P0103-00, P0113-00. The first one relating to the MAF sensor voltage high and Intake air temp high which are in the same system as the temp sensor is intergrated into the MAF i believe.
Edit: If there is any website for a manual I could look at that would be very helpful, Ive tried local dealerships and they havent had any

 

[krusing]

MIL = Malfunction Indicator Lamp = Engine Light

If a DTC is triggered/recorded, it usually activates the MIL (Engine Light)

Anything Engine Related, goes to the ECU, not the BCM, however, they need to be linked,
So do not disconnect them at any time.