What should bank 1 fuel trim be at idle?
If long-term fuel trim (LTFT) for bank 1 is 25% at idle, but corrects to 4% at 1,500 and 2,500 rpm, focus on factors that cause a lean condition at idle, such as a vacuum leak.
What to do if your Honda code is not working?
A guide on how to check your codes: If playback doesn’t begin shortly, try restarting your device. Videos you watch may be added to the TV’s watch history and influence TV recommendations. To avoid this, cancel and sign in to YouTube on your computer. An error occurred while retrieving sharing information.
When to use fuel trim to identify a problem?
Fuel trim can also be used to identify which bank of cylinders is causing a problem. If the LTFT for bank 1 is 20% and the LTFT for bank 2 is 3%, the source of the problem is associated with bank 1 cylinders only.
What was the problem with my fuel gauge?
Yeah Ron was right on the mark when it came to my gauges. I had a wire that wasn’t making a good power connection and it was cousing it to stick. Bought new gauge cluster and it fixed it. It happened to be a wire brok loose in the old cluster.
What causes p0172 and p0175 DTCs to set?
If the extreme Rich Condition that’s causing the PCM to cut fuel to its maximum limit is present, you’ll see the Long Term Fuel Trim values of one or both banks stuck somewhere around -20%. Remember, an uncontrollable Rich Condition is the one that causes P0172 and/or P0175 DTCs to set.
What does a code p0172 mean on a car?
A code P0172 may mean that one or more of the following has happened: The MAF (Mass Air Flow) Sensor is dirty or faulty. Note: The use of “oiled” air filters can cause the MAF to become dirty if the filter is over-oiled. There is also an issue with some vehicles where the MAF sensors leak the silicone potting material used to protect the circuitry.
What happens when fuel trim is below 30%?
In extreme circumstances you may see fuel trim at -30%. The ECM/PCM performs fuel trim Correction by modifying injector pulse. Long term fuel trim is a coarse adjustment factor that will slowly ratchet in the same direction as short fuel trim until short fuel trim returns to the zero range.
If long-term fuel trim (LTFT) for bank 1 is 25% at idle, but corrects to 4% at 1,500 and 2,500 rpm, focus on factors that cause a lean condition at idle, such as a vacuum leak.
If the extreme Rich Condition that’s causing the PCM to cut fuel to its maximum limit is present, you’ll see the Long Term Fuel Trim values of one or both banks stuck somewhere around -20%. Remember, an uncontrollable Rich Condition is the one that causes P0172 and/or P0175 DTCs to set.
In extreme circumstances you may see fuel trim at -30%. The ECM/PCM performs fuel trim Correction by modifying injector pulse. Long term fuel trim is a coarse adjustment factor that will slowly ratchet in the same direction as short fuel trim until short fuel trim returns to the zero range.
What causes a car to have code p0172?
And again, the trees and flowers need it to survive. Exhaust leak is another possible cause of code P0172.
How does short term fuel trim ( STFT ) work?
Short Term Fuel Trim (STFT) Short-term fuel trims occur as a direct result of changes in the oxygen content of the exhaust stream. The exhaust stream is monitored by an oxygen sensor upstream of the catalytic converter, and the signal voltage it generates is directly proportional to the oxygen content of the exhaust stream.
When to take a long term fuel trim?
Note also that fuel trim values should only be taken when the engine had been running at the above speeds for at least 30 seconds. Ideally, long-term fuel trims should be at, or close to 0% when the engine is running at a steady speed.
What causes a p0170 fuel trim malfunction?
It may also have a P0173 referring to the same malfunction but on bank two. Symptoms of a P0170 DTC may include: Potential causes include a vacuum leak, unmetered air leaks Fuel saturated engine oil Leak in turbo air charge hoses (if equipped) Possibly bad O2 sensor (If Mercedes, may require adaptation with M-Benz compatible scan tool.)