NISSAN AIRFLOW METER DIAGRAMS



KEY:

Airflow Meter Found on Vehicle Label

Wire colour vs Function

Size

Notes





CA18 AFM

Nissan Silvia S13


Pin A - nothing / not needed

Pin B - +12v power

Pin C - ground

Pin D - air flow signal out

65mm

 



SR20 AFM

Nissan S14/200SX


Pin A - nothing / not needed

Pin B - +12v power

Pin C - ground

Pin D - air flow signal out

65mm

 


RB20 AFM

Nissan Skyline R32


Wire A - Not Connected

Wire B - Signal

Wire C - 12v Ground

Wire D - Signal Ground

Wire E - 12v Power

80mm

Same size and calabration as Rb25 AFM



RB25 AFM Series 1

Nissan Skyline R33 Series 1


Wire A - Not Connected

Wire B - Signal

Wire C - 12v Ground

Wire D - Signal Ground

Wire E - 12v Power

80mm

Can be used on RB26 in twin form as an upgrade from the standard AFM's (ECU Change required)



RB25 AFM Series 2

Nissan Skyline R33 Series 2


White with Blue Trace - Ground

Orange with Black Trace- Signal

Black with White Trace - 12v Power

80mm

Same size and calabration as Rb25 AFM



RB26 AFM

Nissan Skyline GTR Twin Turbo


?????????

65mm

Label is same colour as Z32. This is the smallest unit which is 65mm opening diameter. Is it very obvious which AFM is a Z32 and which is an RB26 from the phyiscal size, despite same colour label. The part no is A36-000 J70




RB26 NISMO AFM

Nissan Skyline GTR Twin Turbo


?????????

65mm

This AFM has the resolution of the Z32 but has the same size as the stock, so you can keep the same piping, air intake and tubing as stock. The part no is A36-000 J71.



Z32 AFM

Nissan 300zx Twin Turbo


Wire 1 - Not Connected

Wire 2 - Signal

Wire 3 - 12v Ground

Wire 4 - Signal Ground

Wire 5 - 12v Power

Wire 6 Not Connected

80mm

Same size as RB20/RB25 but has higher calibration. Should be good for around 350rwkw. Perfect swap into Rb20/Rb25 as bolt pattern is identical and no change is required. RB30 AFM plug fits which can be had very cheaply from any nissan/holden wrecker



Q45 AFM

Nissan Infiniti Q45 V8


Wire 1 (White) - Signal

Wire 2 (Black) - Ground

Wire 3 (White & Black --have seen red and black--) - 12v Power

90mm

Higher calibration and larger diameter airflow meter. Has been known to go up to 450rwkw. The physical body of the unit is larger and it wont fit standard pod filter adapters or airboxes. It is just over 3.5" in diameter on the outside. The inside diameter is 3".