1. Fault code applies to: all automobile manufacturers.
Fault code: P3400
English definition: cylinder shutdown system (1 line)
English definition: cylinder deactivation system (cylinder bank 1)
Category: cylinder stop
Background knowledge: For some high-powered cars, when the load is small, the throttle valve is almost closed, and the engine needs to do work to intake air. At this time, the compression pressure of the mixture in the cylinder is also very low, resulting in low efficiency. The cylinder deactivation system can achieve higher engine efficiency by closing the intake and exhaust valves of some cylinders.
2. The fault code is applicable to: Volvo.
Fault code: P3400
English definition: camshaft position (CMP) sensor (CMP), intake-signal error-signal error.
English definition: CMP sensor signal error.
Category: power system (customized by the manufacturer)
Background knowledge: The function of camshaft is to control the opening and closing of valves. In the variable valve timing system, the electronic camshaft control valve (or oil control valve, OCV) adjusts the angle of the camshaft by changing the oil pressure of the camshaft adjuster (mechanical) according to the instruction of the engine control module (ECM) to ensure that the valve opens and closes at the best time. The function of camshaft position (CMP) sensor is to transmit camshaft position (relative position of valve) to electronic control unit (ECU) in the form of voltage signal.
3. The fault code is applicable to: Volvo.
Fault code: P3400
English definition: knock sensor-signal error
English definition: knock sensor-signal error
Category: power system (customized by the manufacturer)
Background: When the engine speed changes, the powertrain control module (PCM) uses knock sensors to detect vibration. The knock sensor will express vibration in the form of voltage. When necessary, the electronic control module (ECU) will delay the ignition to avoid knocking.