P1991 Maserati Barchetta OBD Code

OBD/2 P1991 error code description and symptoms.

The input turbine speed sensor detects rotation of the input shaft of the input shaft speed sensor transmission. The computer uses that information, along with the output shaft speed sensor to determine if the transmission is operating according to plan. If the computer detects a difference between the input shaft speed , and the expected output shaft speed, it will adjust transmission pump pressure to prevent clutch disc slip. If adding pressure doesn't solve the problem, it will set a trouble code.

One example of this would be when an automatic vehicle in placed in gear. To prevent the added drag from the torque converter and transmission from reducing the idling speed, the PCM will command the idle control valve to allow more air to enter the engine, while at the same time, adjusting the injector pulse width to inject more fuel to suit the increased amount of air. Note that the idle air control valve is closed by the PCM when the throttle plate is opened to prevent excess air from entering the engine.

P1991 Maserati Barchetta Error Code Repair Process :

If your secondary air injection system switching valve a circuit malfunction check engine light is illuminated, it's best to take it in for diagnostic testing, which can feel like a hassle. Because while the lights vary in appearance from vehicle to vehicle, all have the same basic meaning: There's a problem with the car's emissions system. The on-board diagnostics system P1991 and engine control unit are in charge of monitoring a bunch of different secondary air injection system switching valve a circuit malfunction, and if they get a reading that's a little out of whack, up pops the check engine light.

Common Causes of Maserati Barchetta P1991 OBD2 Code

A common cause of code P1991 is the failure of Secondary Air Injection System Switching Valve A Circuit Malfunction, but there are several other possible causes as well, such as ;

Faulty Air Flow Meter
Camshaft advance mechanism binding (VCT unit)
Faulty spark plug (s)
Lack of fuel

P1991 is a kind of Powertrain Trouble Code

Powertrain of a modern automobile, comprising engine (with exhaust system), transmission, drive shaft, suspension and the wheels. In a motor vehicle, the term powertrain or powerplant describes the main components that generate power and deliver it to the road surface, water, or air.

Engine OBD 2 Codes website is a freeware resource center for engine trouble codes.

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P1991 Maserati Barchetta OBD Code

P1991 Maserati Barchetta Error Code Repair Process :

Common Causes of Maserati Barchetta P1991 OBD2 Code

P1991 code for other Maserati cars