Fuel trim is related to the feedback compensation value, not to the basic injection time. Fuel trim includes short–term fuel trim and long–term fuel trim. Short–term fuel trim is the short–term fuel compensation used to maintain the air–fuel ratio at its ideal theoretical value. The signal from the A/F sensor is approximately proportional to the existing air–fuel ratio, and ECM compares it with the ideal theoretical value, the ECM reduces fuel volume immediately if the air–fuel ratio is RICH and increases fuel volume if it is LEAN. Long–term fuel trim compensates for the deviation from the central value of the short–term fuel trim stored by each engine tolerance, and the deviation from the central value due to the passage of time and changes of environment. If both the short–term fuel trim and long–term fuel trim exceed a certain value, it is detected as a malfunction and the MIL lights up.
Showing posts with label bank 1. Show all posts
Showing posts with label bank 1. Show all posts
Wednesday, June 2, 2010
2002 Toyota Tacoma System too Lean (Fuel Trim) Engine Diagnostics
2:41 AM by onesecond
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Labels: actual air, af1, air fuel ratio, bank 1, dtc, engine diagnostics, injection time, lean side, obd ii scan tool, output voltage, p0171, passage of time, sensor output, tacoma system, theoretical value, tolerance, Toyota, toyota tacoma
Labels: actual air, af1, air fuel ratio, bank 1, dtc, engine diagnostics, injection time, lean side, obd ii scan tool, output voltage, p0171, passage of time, sensor output, tacoma system, theoretical value, tolerance, Toyota, toyota tacoma
2009 Dodge Challenger Crankshaft Position Sensor Intermittent MIL Illumination Diagnostic Trouble Code
2:30 AM by onesecond
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Labels: 2009 dodge challenger, 7l, bank 1, crank sensor, crankshaft, crankshaft position sensor, cylinder misfire, diagnosis, diagnostic procedures, Dodge, dodge challenger, egg, illumination, models, october 8, scan tool, starscan, trouble code
Labels: 2009 dodge challenger, 7l, bank 1, crank sensor, crankshaft, crankshaft position sensor, cylinder misfire, diagnosis, diagnostic procedures, Dodge, dodge challenger, egg, illumination, models, october 8, scan tool, starscan, trouble code
This bulletin involves adding a shim to the crank sensor and verifying the condition has been corrected and only if necessary, replacing the flexplate. NOTE: This bulletin applies to models equipped with a 2.7L or 3.5L engine (sales code EER or EGG) built before October 8, 20008 (MDH 0810XX).
Saturday, May 15, 2010
2000-2002 G20 Mil ON Rear O2 Sensor DTC
10:04 PM by onesecond
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Labels: bank 1, diagnosis results, dtc, dtcs, ecm, figure 1, high voltage, Infiniti, max voltage, o2 sensor, oxygen sensor, self diagnosis
Labels: bank 1, diagnosis results, dtc, dtcs, ecm, figure 1, high voltage, Infiniti, max voltage, o2 sensor, oxygen sensor, self diagnosis
If a 2000 to 2002 G20 has a MIL "On" and any of the following DTCs stored in the ECM:
• P0138 Heated Oxygen Sensor 2 (Rear) (Bank 1) (Max. Voltage Monitoring)
• P0139 Heated Oxygen Sensor 2 (Rear) (Bank 1) (Response Monitoring)
• P0140 Heated Oxygen Sensor 2 (Rear) (Bank 1) (High Voltage)
Start with the Service Procedure to find out if the bulletin applies to this vehicle. If it does apply, complete the Service Procedure to repair the incident, if it should occur.
• P0138 Heated Oxygen Sensor 2 (Rear) (Bank 1) (Max. Voltage Monitoring)
• P0139 Heated Oxygen Sensor 2 (Rear) (Bank 1) (Response Monitoring)
• P0140 Heated Oxygen Sensor 2 (Rear) (Bank 1) (High Voltage)
Start with the Service Procedure to find out if the bulletin applies to this vehicle. If it does apply, complete the Service Procedure to repair the incident, if it should occur.
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