Additive Adaptive Mixture Correction TRA Bank 2 Drive Cycle B

DTC P0175
Additive adaptive mixture correction TRA bank 2 Drive cycle B:Signal out of range - below minimum.

Possible causes by suggested order of priority:
- Air leak between MAFS and inlet manifold (high TRA).
- Air leak in inlet manifold (high TRA).
- MAF sensor inaccurate.
- Fuel leak in one injector (low TRA).
- Part load breather pipe.

Air leak between MAFS and inlet manifold (high TRA).
- Fuelling adaption TRA also abnormally high on bank A (left)
- There are no misfire faults set on the vehicle
- There are no oxygen sensor or catalyst faults set on the vehicle
- Air leak near to MAFS.
- Air leak near to IACV.
- Air leak near to throttle body.
- If TRA adaption is normal on bank A (left) the problem is not an air leak.
- Misfire, oxygen sensor or catalyst faults could give a false indication of an air leak fault.

Air leak in inlet manifold (high TRA).
- Fuelling adaption TRA also abnormally high on bank A (left)
- There are no misfire faults set on the vehicle
- There are no oxygen sensor or catalyst faults set on the vehicle
- Air leak in inlet manifold gaskets or seals.
- Porous inlet manifold casting (especially on new manifolds).
- Air leak around injector or spark plug seals.
- Air leak in injector or spark plug.
- If TRA adaption is normal on bank A (left) the problem is not an air leak.
- Misfire, oxygen sensor or catalyst faults could give a false indication of an air leak fault.

MAF sensor inaccurate.
- Fuelling adaption TRA is also abnormal on bank A (left).
- There are no misfire faults set on the vehicle.
- There are no oxygen sensor or catalyst faults set.
- MAF sensor is functioning but inaccurate.
- Renew MAFS or test by substitution with known good unit.

Fuel leak in one injector (low TRA).
- Fuelling adaption TRA is slightly reduced or normal on bank A (left) and reduced on bank B (right).
- There are no misfire faults set on bank B (right) the vehicle. - There are no oxygen sensor or catalyst faults set on bank B (right).
- Continuous fuel seepage in one injector.
- Misfire, oxygen sensor or catalyst faults could give a false indication of a fuel leak fault.
- Look for evidence of the fuel leak (excess fuel present in cylinder)
- Fit a pressure gauge to the fuel rail and check that the fuel pressure does not die away quickly when the ignition is switched off (indicating a leak).

Part load breather pipe.
- Part load breather pipe connections.
- State of the part load breather pipe for cracks etc.