Also like the N54, it seems to make more than the advertised horsepower. The MAP sensor signal voltage changes between about 1 Volt and 4.9 Volts depending on the pressure. If it’s a MAP sensor, the signal voltage with the ignition key ON, engine OFF (KOEO) should be around 4-4.9 Volts. Failure to do this can result in repeated problems and possible extensive damage to the vehicle’s powertrain. The Check Engine Light is the main indicator used by your vehicle’s computer to warn of a pending or current problem within the powertrain. Idle Air Control Valve (Off Engine) Step 3 — Engine vacuum is a sealed system and must hold a specific amount to maintain proper idle conditions, inspect the engine vacuum hoses and intake gaskets. This could be caused by a faulty oxygen sensor itself, corrosion in the sensor connector, problem with the sensor wiring, exhaust leak or a number of other causes.
This acceptable idle speed is determined by what the ECM considers to be the “DESIRED IDLE”, which is an actual PID on the scan tool. The statements expressed above are only for informational purposes and should be independently verified. When this condition exists the computer is rendered unbalanced and will not react correctly.
Then work the pedal a few times and see if the voltage changes. If you continue to obtain different readings with the throttle released, suspect a sticking throttle shaft or faulty TPS. Some engines feature convenient bleeder valves (screws) at the upper coolant area. Following a diagnostic flow chart will run you through a series of steps to be able to diagnose why this problem is occurring. It is important to repair the problem before clearing the codes from the system. Если вы не сливаете масло, то узнайте из своего руководства по эксплуатации, как лучше переворачивать агрегат, чтобы избежать протечки. Part 5 of 6: Clearing the Check Engine Light This should only be done once any and all repairs are done. Other than that, it hasn’t missed a beat.