I copied the below from the FAQ's page off this site so no-one has to go looking for it. I followed the instructions to test the AFM and got a reading of over 10volts when measured at terminals 2 and 4, however when checked the readings at terminals 1 and 3 as per the second paragraph, it was 3.58volts - within the limits.
It doesn't make sense to me that the reading at terminals 2 and 4 say the AFM is buggered, but 1 and 3 say that it's set within limits.
Is my airflow meter stuffed or not?
THE BELOW IS COPIED FROM ANOTHER PAGE OF THIS FORUM (I don't know how to do it any other way)
TO TEST AFM:
pull back the rubber boot on the AFM connector revealing the wires. grab your multimeter and stick the probes on wire 4 (white) and 2 (1 being the closest to the airbox) with the multimeter on DC voltage. turn the ignition on and the voltage reading should be between 1.26V (lean) and 1.32V (rich). this is the base setting and if it is out then the AFM wont be able to be adjusted to a satisfactory mixture (meaning you need a new one)
and just for interests sake you can test the mixture by putting the probes on wire 1 and 3 with the key on and measuring the voltage. 3.6V is the factory setting which is lean, with 2.0V being rich. the mixture should be in the vacinity of 2.0-4.0i couldn't get the LED's to flash and therefore couldn't set it using the computer so i did it this way and set it to 3.5V (AFM resistance of 375 ohms) and then checked it using the computer and it was right, LED's flashing together.
It doesn't make sense to me that the reading at terminals 2 and 4 say the AFM is buggered, but 1 and 3 say that it's set within limits.
Is my airflow meter stuffed or not?
THE BELOW IS COPIED FROM ANOTHER PAGE OF THIS FORUM (I don't know how to do it any other way)
TO TEST AFM:
pull back the rubber boot on the AFM connector revealing the wires. grab your multimeter and stick the probes on wire 4 (white) and 2 (1 being the closest to the airbox) with the multimeter on DC voltage. turn the ignition on and the voltage reading should be between 1.26V (lean) and 1.32V (rich). this is the base setting and if it is out then the AFM wont be able to be adjusted to a satisfactory mixture (meaning you need a new one)
and just for interests sake you can test the mixture by putting the probes on wire 1 and 3 with the key on and measuring the voltage. 3.6V is the factory setting which is lean, with 2.0V being rich. the mixture should be in the vacinity of 2.0-4.0i couldn't get the LED's to flash and therefore couldn't set it using the computer so i did it this way and set it to 3.5V (AFM resistance of 375 ohms) and then checked it using the computer and it was right, LED's flashing together.