How does the rocker arm actuator work on a PCM?
The rocker arm actuator circuit is completed when the PCM applies a ground pulse to the appropriate actuator at the exact interval. The actuator will push up on one end of the rocker arm which is affixed to the cylinder head on a stationary pivot.
What does DTC stand for in rocker arm actuator?
DTC P2646 is defined as “Rocker Arm Actuator A, Bank 1, Performance or Stuck Off.” Honda, Acura, and a couple other automakers use this definition.
What’s the difference between Honda and Toyota rocker arm actuator?
Each automaker has it’s own definitions of the system – Toyota uses VVT (Variable Valve Timing), while Honda uses VTEC, which controls lift, and VTC (Valve Timing Control). The result was more power when needed, such as during acceleration, and better fuel economy, while cruising.
Why is my DTC p2646 rocker arm not working?
Depending on year, make, and model, DTC P2646 may have number of causes. Here are some of the most common. Oil Problems – Low oil level, incorrect oil viscosity, or thinned oil can all cause problems with the VTEC system.
How does the VTEC system control the rocker arm?
The VTEC system controls the rocker arm control solenoid through the powertrain control module (PCM). The PCM uses the rocker arm oil pressure switch to monitor and verify the oil pressure so the variable timing mechanism can be properly activated.
What is the OBD code for the rocker arm?
If the PCM does not receive the correct voltage signal back from the rocker arm oil pressure switch, it may set code P2646. The “A” in this OBD code’s definition indicates the intake camshaft.
What does the rocker arm control solenoid do?
In vehicles equipped with VTEC, the rocker arm control solenoid supplies hydraulic pressure to the variable timing and lift mechanism. This allows the VTEC system to adjust valve timing and lift as needed.
When is a rocker arm actuator stuck on?
If the PCM detects a level of resistance from the rocker arm actuator circuit indicating that it is stuck in the on (valve open) position, a code P2647 will be stored and a malfunction indicator lamp may be illuminated. What are the common causes of code P2647? What are the symptoms of code P2647? How do you troubleshoot code P2647?