The rocker arm actuator circuit is completed when the PCM applies a ground pulse to the appropriate actuator at the exact interval. Typical operation will dictate that a 12-volt signal is applied to all rocker arm solenoids (actuators) with the ignition in the run position. It can also be detrimental because of the delicate nature of the electronic components which are required to operate in perfect synchronicity with each other. This type of electronically controlled valve train system is beneficial because it eliminates the need for mechanical engine timing components that need to be replaced at regular intervals. By monitoring the position of the crankshaft, the PCM is able to accurately calculate when to open and close individual valves in order to optimize power output and maximize fuel efficiency.
These systems are often referred to as variable valve timing (VVT, VTEC, etc.)Ĭrankshaft position is constantly monitored by the PCM (with the engine running) by – you guessed it – the crankshaft position sensor. More commonly, electronic actuators are utilized to manipulate engine oil pressure which is used to advance and retard valve timing (individually or in groups) as engine RPM and engine load change. In this advanced type of system, conventional camshafts are unnecessary because the PCM controls electronic solenoids (referred to here as actuators) which open and close intake and exhaust valves at the appropriate time. This includes vehicles which electronically manipulate engine oil pressure to assist in valve timing variation.Ī select number (very rare) of vehicle applications employ an electronic system of opening and closing intake and exhaust valves.
P2646 07 HONDA ODYSSEY CODE
This code is applicable to vehicles with electronically assisted valve train systems, only. The designation (A) may apply to an individual cylinder intake valve rocker or to all of the intake valve rockers for engine bank one. Bank 1 denotes that the problem has occurred in the bank of the engine which contains the number one cylinder. When an OBD-II equipped vehicle has stored a code P02647, it means that the powertrain control module (PCM) has detected a valve train (rocker arm) malfunction for engine bank one.
P2646 07 HONDA ODYSSEY PRO
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