Maf fault code 23 help please ???
#1
Maf fault code 23 help please ???
I have a problem with my sti v5 type-r, on light throttle there is a slight bit of hesitation/missfire when this happens it records a fault on the ecu which is fault code 23 maf, I have replaced the maf sensor with a genuine new part, reset ecu and road tested, when I was on road test I notice the same fault so I checked the ecu and it had stored the same fault code even with the new maf could any other faults cause this to happen ie coil pack etc ?
Any ideas cheers mark.
Any ideas cheers mark.
#4
A MAF code can be caused by:
1. Faulty MAF
2. Faulty MAF wiring
3. Possibly air leak (never seen this but a possibility to check).
Get a repair manual and follow the procedure in it to test the MAF and wiring.
1. Faulty MAF
2. Faulty MAF wiring
3. Possibly air leak (never seen this but a possibility to check).
Get a repair manual and follow the procedure in it to test the MAF and wiring.
#6
Scooby Regular
iTrader: (8)
Are you doing a full reset procedure on the ECU??
If so, does it flash the all clear sequence??
If not then do one as per these instructions.
If so, does it flash the all clear sequence??
If not then do one as per these instructions.
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#12
Scooby Regular
iTrader: (8)
With you engine off, but ignition on, 0-0.3v (or 1.0v)
With engine at idle, 0.8-1.2v (or 1.0-1.7v) and increasing with load, you get the idea. (both readings as i do not know which ECU you have).
If these voltages are outside of the limits then the ECU will think, rightly or wrongly that the MAF unit is at fault. When in fact, it could be a fault with the plugs or loom.
IIRC your MAF sensor is the cartridge type, does it have the 2 contacts half way down, these could be worth a check as could the point where they contact inside the MAF sensor holder. (Not au fait with your MY's MAF).
Have you 'just' fitted the sensor, or have you actually removed the MAF tube/inlet tract and checked for water/oil contamination or obstruction??
Last edited by Glowplug; 11 January 2011 at 02:38 PM.
#13
I have fitted a new sensor but left the housing in-place could the lambda probe cause this fault as i had a simlar fault 5months ago and fitted a brand new non-gen
sensor now it seems to same, could I unplug lambda probe and see if it recorded mad fault again ?.
sensor now it seems to same, could I unplug lambda probe and see if it recorded mad fault again ?.
#16
What Iam saying is maybe it's the lambda probe that's causing the airflow fault to show on ecu, so if I unplug the lambda sensor and then see if it still bring this code up on ecu?
#17
Scooby Regular
iTrader: (8)
As i said earlier, you have a MAF fault, whether it be the sensor it's self or a plug/loom issue.
The MAF measures the volumetric air entering the system, if it, or it's connections are broken, obstructed or contaminated then it will misread which will cause your hesitation/rough running issues and possibly a CEL.
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