SRX RWD V8-4.6L VIN A (2006)
Camshaft Actuator Components
The CMP actuator solenoids, or electromagnets, are located on the front of the engine and are mounted to their corresponding bank CMP actuator
housing.
The oil control valves are threaded, and attach the CMP actuators to the front of the camshafts. The oil control valve meters the oil flow to the CMP
actuator through the advancing and retarding oil ports. With no command fro the ECM, all of the oil is ported to the advancing chambers of the
exhaust CMP actuators and to the retarding chambers of the intake CMP actuators. With full command from the ECM, all of the oil is ported to the
retarding chambers of the exhaust CMP actuators and to the advancing chambers of the intake CMP actuators. When the intake or exhaust camshafts
reach a desired position, above 0 degrees on the scan tool, the ECM will apply an electrical signal to the solenoids in order to hold the CMP actuators
in the desired position. The oil control valves will port engine oil evenly to the advancing and retarding chambers of the CMP actuators in order to
hold the camshafts in the desired position. The oil control valves will allow enough engine oil to flow to compensate for any leakage past the CMP
actuators in order to hold the camshafts in a steady position.
The CMP actuators interface the timing chain to the camshafts, and are able to change the camshaft timing in relation to the crankshaft. The intake
CMP actuators have the ability to move the intake camshafts a total of 40 degrees from the parked position. The exhaust CMP actuators have the
ability to move the exhaust camshafts a total of 50 degrees from the parked position. With the engine OFF or with the CMP actuators not commanded,
the exhaust CMP actuators are parked at the full advance position of 133 degrees ATDC and the intake CMP actuators are parked at the full retard
position of 117 degrees before top dead center (BTDC). The CMP Angle parameters on the scan tool will indicate 0 degrees with the engine running
and the CMP actuators in the parked position for both exhaust and intake camshafts.
