Cel: P0170,p1400, P1500

[Totaleclipse04]

Ok guys pulled a few codes from my car today
P0170: Fuel Trim Malfunction
P1400: Manifold Differential Pressure Sensor Circuit Malfunction
P1500: Manufacture Controlled Vehicle speed, Idle Control and Auxillary Input


OK I was told by a friend of mine that the P0170 is a front O2 Sensor that i need to replace. He also told me that the P1400 is due to me having a 6 bolt in a 97. Something about the MAP sensor not being compatible or something like that. The P1500 is what im having the issue with I have found two different descriptions for this code. One being Manufacture Controlled Vehicle speed, Idle Control and Axillary Input. The other is something about the Alternator FR Terminal Circuit.

And recently i have ran into a problem with my charging system. I have a SFAC II set to stock settings and its telling me that my battery is sitting right at 12 volts maybe a little under till i rev it to like 3K RPM. Then it starts charging like normal.

Mods:
6 Bolt, 3" exhaust after the rear o2 sensor, SAFC II running stock settings, Boost controller, Turbo timer, cone filter with adapter.


Can anyone help me I really want to get rid of these freakin CEL's

 

[RedTurboEclipse]

I can confirm P0170 as o2 sensor, thats what I was getting, confirmed it by logging the o2 sensor and itw as not cycling. But I believe that code is tied in to other things as well.

 

[MrBoxx]

Do not bump your posts, or create duplicate threads.

Do you have a Manifold Differential Pressure sensor on your intake manifold? Are you using a 1g or 2g manifold?

 

[Totaleclipse04]

im running a first gen manifold. with the stock mass airflow sensor.

 

[MrBoxx]

If you're using a stock 1g manifold, it doesn't have a place for the 2g's MDP sensor to bolt onto. If the sensor isn't detected, or the ECU thinks the MDP is faulty, it'll throw that code. That may help explain your fuel trim code as well.

 

[luv2rallye]

I can confirm P1500 as generator (ie. alternator) FR terminal circuit malfunction. This is either an open circuit in the alternator FR terminal circuit (alt itself or FR wiring) OR the ECU. First check that the alt FR terminal wire (green one) is still connected and not broken (it goes to ECU pin 41). This is a sense wire so ECU can control idle speed based on alt load. The battery should have 14V on it even at idle so without this wire connected the ECU would not know to increase idle speed to raise the voltage to 14V. It also of course, could be a bad regulator in alt (not producing FR signal). Lastly it could be ECU.