Could some one please tell where it says the correct voltage for the middle (ground) wire on the MAF sensor connector?
This source says if more than .009V are present, re-grounding of the MAF sensor is in order.
MAF Sensor Grounding
I would like to know where this information comes from. Is it in an SR20DE engine vehicle's Field Service Manual somewhere?
In my FSM for '91 Infiniti G20, it says that there should be 1-3 -1.7V on terminal A, when testing the MAF.
Terminal "A" has no wire running to it, so maybe Terminal "A" is either Terminal B or D, depending how you look at the drawing of the Connector X-B-C-D or X-A-B-C. ??
There are 3 wires, Orange, White, Orange. The middle wire is white and in understood to be the Ground wire.
I believe Terminal B is the relevant Terminal "A".
With ENGINE at ILDE -weak idle, I get the following voltage
(From MAF sensor to Battery Ground):
Connector looks like this ---> [ X-B-C-D ]
Terminal A (X) ---> 0V no wire running to this slot on the connector
Terminal B ---> 12.4V
Terminal C ---> 11.10V
Terminal D ---> 10.5V
I've been following the instructions from this thread, posts #5 and #7 ----->
MAF Sensor
There is CONTINUITY on the MAF sensor GROUND wire with the ECU connector UNPLUGGED
and PLUGGED.
I have a Known Good MAF sensor which I switched with the stock one that I have been testing.
Below are the voltage readings, comparing both MAF sensors' results in the same problematic G20.
Testing, MAF SENSOR CONNECTOR to ECU Pin 16, MAF connector connected:
[ X - B - C - D ]
MAF #1 (from problematic G20)
KOEOFF:
Terminal D (input signal wire) --------> .60V
Terminal B (power supply wire) ------> 1.23V
ENGINE RUNNING AT ABOUT 1,000 rpms
Terminal D ---------------------------------> .66V
Terminal B ---------------------------------> 1.24V
MAF #2 (Known Good MAF sensor)
KOEOFF:
Terminal D (input signal wire) --------> .61V
Terminal B (power supply wire) ------> 1.26V
ENGINE RUNNING AT ABOUT 1,000 rpms
Terminal D ---------------------------------> .68V
Terminal B ---------------------------------> 1.26V
- Basically the same numbers, Is it that the MAF sensor not the problem? There is a Knock Sensor code as well as the MAF code in the ECU, and KS came first.
- Could the KS code cause a MAF code?
- Could a vacuum leak cause either of these codes? ( I have been hearing a hissing, but have thought it is due to air getting sucked into the power steering system. A separate issue)