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View Full Version : Engine codes: P1400,P0170

blageo23
07-22-2005, 01:58 PM
What do these mean???
P1400-Manifold Differentail Pressure Sensor Circuit Malfuncion
P0170-Fuel Trim Malfunction

What could cause these problems? My car like studders till like 5000 and then it goes up smooth.
Thanks,
Mike
Onefast99gsx
07-22-2005, 03:33 PM
The manifold differential pressure sensor is located directly on top of the 2g maifold. You can't miss it. It's there by itself. Check the wiring to it and make sure it's connected. If it is, take the connector off and reseat it.

One of the ECM codes could be triggered by the other, thus one particular problem could throw mulitple codes.

Anyway, Check that sensor.
LightningGSX
07-22-2005, 03:49 PM
P0170-Fuel Trim Malfunction
Either your A/F ratio is way off or the oxygen sensor is bad
blageo23
07-22-2005, 04:17 PM
Well i have the 6bolt swap with the 1g manifold so that sensor is connected to one of the nipplies that comes off the TB. Ill check the connector to it. Thanks for the info!
Onefast99gsx
07-22-2005, 05:29 PM
FYI- You don't need the differential sensor. I have an aftermarket manifold, Magnus. Only thing is, i have dsmlink to shut off the ecu portion for that as well as all that other EGR crap.

As for going from the sensor to the throttle body I'm sure that's an option place to put it. If you can't locate problem, check what LightningGSX said. Like i said before, one or more codes can be generated from a different problem if they are linked in any way.

I'm not sure if these 2 are related or not. The press. diff sensor must have saw a drop in manifold pressure thus throwing a code. Check the hose you have. I know the little nipple on the pressure sensor isn't very big and could potential cause a leak the way you have. Just some ideas.
LightningGSX
07-23-2005, 01:20 PM
In this case it's seems to be 2 seperate problems, unrelated.And since it's a MDP circuit malfunction code and not a EGR related code, without any investigation, I'd say it's either the MDP sensor itself, or the wiring to it.
blageo23
07-23-2005, 01:24 PM
my cars idle was bad. maybe from fuel issue then that could of dropped the pressure and set the code? could that be it?
Thanks,
Mike