Fuel Trim Malfunction (Bank 2)

FAULT ID
P0173

TITLE
Fuel Trim Malfunction (Bank 2)

BACKGROUND
- If a malfunction occurs in the fuel system, the fuel compensation value becomes too large or too small.
- The engine control module checks whether the fuel compensation value is within a specified range.

RANGE OF CHECK & SET CONDITIONS
The fuel compensation value exceeds the specified range for 10 seconds during closed-loop control of the air/fuel ratio.

EFFECT
Limp-in

PROBABLE CAUSES
- Volume air flow sensor failed.
- Injector failed.
- Incorrect fuel pressure.
- Air drawn in from gaps in gasket seals, etc.
- Heated oxygen sensor failed.
- Engine coolant temperature sensor failed.
- Engine control module failed.
- Intake air temperature sensor failed.
- Barometric pressure sensor failed.