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Join Date: Apr 2019
Posts: 1
Fuel Trims

I'm at a loss!!
Model 135i BMW
Perhaps someone from the forum can tell me where to look for faults.
Parts Replaced:
1-MAP sensor on intake
2- O2 sensors (both pre cat) Do I need to reset the Fuel adaptations when these are replaced?

Still getting the P0174 code, and the fuel trims seem to be the culprit.
Below is the freeze frame data.

Freeze Frame
DTC that caused required freeze P0174
frame data storage

Fuel system A status: CL

Fuel system B status: CL

Calculated Load Value 42.0 %

Engine Coolant Temperature 84.20 F

Short Term Fuel Trim -Bank 1 -0.8 %

Long Term Fuel Trim - Bank 1 12.5 %

Short Term Fuel Trim -Bank 2 0.8 %

Long Term Fuel Trim - Bank 2 29.7 %

Intake Manifold Absolute Pressure 11.52 inHg

Engine RPM 680.00 rpm

Vehicle Speed Sensor 0.00 mph

Ignition Timing Advance for #1 -1.5
Cylinder

Intake Air Temperature 41.00 F

Absolute Throttle Position 12.5 %

Time Since Engine Start 136 sec

Fuel Rail Pressure 2190.07 psi

Commanded Evaporative Purge 0.0 %

Fuel Level Input 22.0 %

Barometric Pressure 29.83 inHg

Control module voltage 14.443 V

Absolute Load Value 83.5 %

Commanded Equivalence Ratio 0.999

Relative Throttle Position 2.7 %

Ambient air temperature 46.40 F

Absolute Throttle Position B 12.2 %

Accelerator Pedal Position D 14.9 %

Accelerator Pedal Position E 14.5 %

Commanded Throttle Actuator 3.1 %
Control

Long Term Secondary O2 Sensor -9.4 %
Fuel Trim - Bank1

Long Term Secondary O2 Sensor -12.5 %
Fuel Trim - Bank2
Old 04-02-2019, 06:23 AM
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