Camshaft Actuator System Description; Camshaft Actuator System Overview - Suzuki XL7 2007 Service Manual

Camshaft Actuator System Description

1. Camshaft Actuator Vane
2. Timing Chain Sprocket
3. Engine Oil Pressure-For retarding the camshaft
4. Camshaft
5. Input Signals from Engine Sensors
6. Engine Control Module (ECM)
7. Camshaft Actuator Solenoid
8. Engine Oil Pump
The camshaft actuator system enables the engine control module (ECM) to change camshaft timing of all 4 camshafts
while the engine is operating. The CMP actuator assembly (15) varies the camshaft position in response to directional
changes in oil pressure. The CMP actuator solenoid valve controls the oil pressure that is applied to advance or retard
a camshaft. Modifying camshaft timing under changing engine demand provides better balance between the following
performance concerns:
• Engine power output
• Fuel economy
• Lower tailpipe emissions
The CMP actuator solenoid valve (7) is controlled by the ECM. The crankshaft position (CKP) sensor and the CMP
sensors are used to monitor changes in camshaft positions. The ECM uses the following information in order to
calculate the desired camshaft positions:
• The engine coolant temperature (ECT) sensor
• The calculated engine oil temperature (EOT)
• The mass air flow (MAF) sensor
• The throttle position (TP) sensor
• The vehicle speed sensor (VSS)
• The volumetric efficiency

Camshaft Actuator System Overview

9. Engine Oil Pressure Supply
10. Engine Oil Drain
11. Engine Oil Pressure-For advancing the camshaft
12. Camshaft Actuator Rotor
13. Camshaft Position Sensor Reluctor
14. Camshaft Actuator Lock Pin
15. Camshaft Actuator Housing
Engine Electrical Devices: 1C-3