Automobile fault code Changfeng cheetah p 156 1

OBD fault code applies to: Audi, Volkswagen.

Fault: P 156 1

English definition: fuel quantity regulator-control difference

English definition: fuel quantity regulator-control difference

Category: power system (customized by the manufacturer)

Background knowledge:

OBD fault code applies to: BMW.

Fault: P 156 1

English definition: cold start idle air control system-speed is higher than expected

Cold start idle air control system-speed is higher than expected.

Category: power system (customized by the manufacturer)

Background: Idle air control (IAC) valve has a movable needle valve controlled by a precisely moving stepping motor. When the throttle is closed, IAC valve controls the idle speed by changing the air flow of the bypass pipeline to adapt to the idle speed under different working conditions. When the cold car starts, the idle air control system will request higher air flow to increase the speed.

OBD fault codes are applicable to Honda and Acura.

Fault: P 156 1

English definition: motor commutation sensor B-circuit low input

English definition: motor communication sensor B-circuit low input.

Category: power system (customized by the manufacturer)

Background knowledge:

This OBD fault code applies to: Volvo.

Fault: P 156 1

English definition: cruise control main switch-low signal

English definition: cruise control main switch-low signal

Category: power system (customized by the manufacturer)

Background knowledge: Cruise control system can make the driver keep the speed automatically without stepping on the accelerator.

OBD fault code applies to: mini

Fault: P 156 1

English definition: idle air control system, 1 exhaust-engine speed is too low after cold start.

English definition: idle air control system, cylinder bank 1- engine speed is too low after cold start.

Category: power system (customized by the manufacturer)

Background: Idle air control (IAC) valve has a movable needle valve controlled by a precisely moving stepping motor. When the throttle is closed, IAC valve controls the idle speed by changing the air flow of the bypass pipeline to adapt to the idle speed under different working conditions.

OBD fault codes are applicable to: GM, Buick, Chevrolet, Cadillac, Hummer and Jinbei.

Fault: P 156 1

English definition: constant speed cruise exhaust solenoid valve

English definition: cruise control ventilation solenoid valve

Category: power system (customized by the manufacturer)

Background: The cruise control system controls the throttle angle by controlling the vacuum in the servo, thus controlling the vehicle speed. When acceleration is needed, the vacuum solenoid valve is opened and communicated with the intake manifold (or special vacuum pump), and the vacuum degree in the sealing sleeve is increased, so that the diaphragm is sucked, the spring force is overcome, and the throttle opening is increased by pulling the wire, and the vehicle is accelerated. When the set speed is reached, the vacuum solenoid valve and the ventilation solenoid valve are simultaneously closed. At this time, the vacuum degree in the sealing sleeve remains unchanged, and the car keeps driving at a constant speed. When deceleration is needed, the ventilation solenoid valve is opened to let air enter the sealing sleeve, and the diaphragm spring presses the diaphragm back to its original position, so that the throttle opening is reduced and the automobile decelerates. This fault code indicates that the ventilation control solenoid valve of the cruise control system itself or its circuit is faulty, and the electronic control module (PCM or ECM) is faulty.