Where to translate my CEL codes?

[gtablue]

So I have been searching looking for a check engine light library so that I can figure out what my P1128 code means.

Can someone please direct me?

-nate

[omgbossis21]

www.hmaservice.com I think thats a too rich/lean code and/or an 02 sensor code....

[Jonas53]

That code is for your MAF. I used to get that alot then I bought a new MAF sensor and the problem went away. That sensor is comon to go bad.

[bh206]

but before you go out and buy a new MAF... try cleaning yours.



also this code isn't specifically the MAF.. there are many contributing factors. and if I remember correctly.. thw webtech doesn't even mention the maf for this code.

[Edited by bh206 on Jan 16, 2006 8:03 PM]

[gtablue]

Thank you guys, I guess I will go on my way diagnosing everything!

[Jefo]

Had a P1128 and it was the MAF. Clean first then replace. Replace is a 5 min job but the D**n MAF cost $170 or so.

170 !!! but it looks like a cheap piece of crap plastic.

[gtablue]

Well guys, I have been driving my Accent ever since with this check engine code.

I ended up buying another 5spd Accent and swaped in the MAF from it. No difference.


The car has also developed a miss under throttle. Pretty much anything over 4k Rpm and it pops with a terrible miss.

I have done wires, plugs, and tried a different coil pack. Still the same miss.

Any ideas guys?

[gtablue]

anyone at all?

[1SickGS]

WOW, I can't believe how many people guess and clear codes without even attempting to have the codes analyzed! Did you play with your o2 sensors lately?

P1128 = Upstream Heated O2 Sensors Swapped

[Tugger5000]

From hmaservice.com:

P1128
Long Term Fuel Trim Multipicative System Too Lean

DESCRIPTION

The air/fuel control system, in addition to a number of sensors, includes the following components and systems:

Intake air system.
Exhaust system.
Evaporative emissions control system (includes purge control solenoid valve).
Fuel injectors.
Fuel pressure regulator.
Fuel pump.

For the air/fuel ratio to be within limits, all of the sensors, components and systems associated with the air/fuel control system must function within normal parameters.

FAILURE CONDITIONS

(FOR SHORT-TERM FUEL TRIM)
The ECM will set a code and the Malfunction Indicator Lamp (MIL) will turn on if the short-term fuel trim value goes 10% to 15% rich [for P1123] or if the short-term fuel trim additive value is less than 0.4 milliseconds, or 10% to 15% lean [for P1124] for 30 seconds during two driving cycles when the following conditions are met:

ECM is in closed loop operation.
Engine speed is below 1000 RPM.
Engine coolant temperature is above 158°F (70°C).
Canister purge system is not operating.
Mass air flow is less than 7.5 g/s [for P1123] or 5.5 g/s [for P1124].

(FOR LONG-TERM FUEL TRIM)
The ECM will set a code and the Malfunction Indicator Lamp (MIL) will turn on if the long-term multiplicative value is less than 77% for 30 seconds [for P1127] or if the long-term fuel trim value goes to 10% to 15% lean [for P1128] for 30 seconds during two driving cycles when the following conditions are met:

Engine load exceeds 1.8 milliseconds.
ECM is in closed loop operation [for P1127].
Engine coolant temperature is above 158°F (70°C).
Canister purge system is not operating.
Mass air flow is less than or 5.5 g/s.
Engine speed is below 1000 RPM [for P1128].




Running lean could be anything...