weirdchris555

Here's a question for ya. I just ran through diagnostic 24, checking the MAF. So as I previously said, the positive voltage is good. I then went to check the continuity between the ground on the engine bay plug and pin 17 which is the MAF sensor ground. There was continuity. I proceeded to check the sensor wire continuity for the MAF and it was connected to the correct pin 16. I went back to the ecu plug and checked first the ECU ground which is pin 39 and that was a good ground.

Now comes the good stuff. I went to check the ground between what is title "Sensor Ground" which is pin 21, and there was no ground. I was wondering because I am not too sure but are all the sensor grounds run to that pin 21 which is sensor ground? I also checked the signal for the 02 sensor and that had continuity. The weird thing is like a couple of minutes later I double checked the 02 ground and it was fine. So I went back to check the "Sensor Ground" and it was no good.

If someone knows if all the sensors run to that "sensor ground" pin, that would help greatly since I think thats my problem child.

So to summarize, MAF has good continuity to 12 Volt power, to the ecu MAF ground pin 17, and to the MAF sensor signal Pin 16. The O2 has good Power, good ground to the chasis, and good signal wire to pin 19. Pin 21 titled "sensor ground" does not have continuity to a ground.

Just checked the TPS, Coolant temp sensor, and the cas. The coolant and the cas both had good grounds and continuity to the correct pins. The TPS on the other hand did not have a ground whatsoever but did have continuity to the correct pin for the signal. I may try grounding the tps later today as this would cause the issue at hand.