What is trim fuel?

Fuel trim is the adjustment the engine computer makes to the fuel mixture to maintain a balanced air/fuel ratio. Either the engine is taking away fuel or adding fuel so the exhaust byproducts, measured by the oxygen sensor, add up to an efficient operation. via

What is a fuel trim issue?

Fuel trim is the PCM's adaptive strategy that allows it to deal with these issues by adjusting the amount of fuel that is injected into the engine, but only once it is in closed loop operation. Short- and long-term fuel trim. via

What is fuel trim adaptation?

Fuel trim is a two-part adaptive strategy that adjusts fuel injector pulse width (open time) to adapt to wear, defects, or changes in the system. The two parts of a computer fuel trim adaptive strategy are short-term fuel trim STFT (additive) and long-term fuel trim LTFT (multiplicative). via

How do I check my fuel trim?

How to Read Fuel Trim. The fuel trim value is read by plugging a scan tool into the OBD II diagnostic connector located under the instrument panel (on the drivers side near the steering column). When the key is turned on, the scan tool will initialize and start to communicate with the vehicle's onboard computer. via

What causes fuel trim code?

Diagnostic Trouble Code (DTC) P0170 stands for “Fuel Trim Malfunction (Bank 1).” Fuel trim is the adjustment made by the PCM to the engine's air-fuel mixture. The P0170 code indicates that the fuel trims have reached an abnormally low or abnormally high value for a specified amount of time. via

What sensors affect fuel trim?

The oxygen sensors monitor the accuracy of the computer's fuel trim strategy. The oxygen sensor is located in the exhaust and monitors the amount of unburned oxygen in the exhaust. This is an indicator of the fuel mixture integrity. via

What should my o2 sensor read?

A properly functioning oxygen sensor will show a rapidly fluctuating output voltage between approximately 0.1 and 1.0 volts. The time taken for the voltage to change from 0.1 V to 1.0 V (referred to as the lean to rich response time) should be about 300 milliseconds. via

How do I fix code P0173?

  • Replacing the mass air flow sensor.
  • Replacing the fuel pressure regulator.
  • Replacing the intake manifold gaskets.
  • Repairing or replacing the engine air filter intake system.
  • Replacing a vacuum line connected to the throttle body.
  • Repairing a leaking brake booster.
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