Fuel pump relay
The V6 engine uses a closed fuel supply system. Regardless of the intake manifold pressure, the fuel system maintains a constant fuel pressure of 4.5 bar. Fuel is supplied to the injectors by a fuel pump located in the fuel tank. ECM (the engine control unit) controls power to the fuel pump via the fuel pump relay. In the event of an ECM collision (the engine control unit) receives a collision signal from the airbag and seat belt control module and de-energizes the fuel pump relay. Fuel system pressure builds up immediately after ECM power is turned on (the engine control unit), and then the fuel pump is turned off until the engine starts.
The fuel pump relay is located in the CJB (central junction box). The fuel pump is placed in the fuel tank. For more information refer to Fuel Tanks and Lines (310-01A)
Viscous fan control
ECM block (the engine control unit) regulates engine cooling by controlling a viscous fan. To control fan performance, the ECM (the engine control unit) uses PWM (pulse width modulation) -signals by controlling the coefficient of clutch slippage. The EMS fan speed is determined by a Hall effect sensor.
Starter relay
Power is supplied to the starter relay through fusible link 19 in the battery junction box.
ECM (the engine control unit) controls the starter relay by supplying a 12V signal to the relay coil when the ignition switch is in the engine start position. This occurs when the gear selector is in P or N.
Condenser fan control
In ECM (the engine control unit) via CAN bus (local area network of controllers) messages are received from the ATC control unit (automatic temperature control) for cooling fan and idle speed control.
AirConCoolingRequest (request air conditioner cooling level)
This signal sets the cooling level (for fan (ov) engine cooling systems), required by the ATC system (automatic temperature control) . As a result of internal calibration, the EMS selects the fans to be driven and determines the required fan speeds for each level requested.
AirConIdleSpeedRequest (air conditioner idle speed request)
This signal determines whether or not to increase the idle speed for the ATC system (automatic temperature control) . The amount of increase in idle speed is calculated in the EMS during the calibration process.
IMT valve (intake manifold adjustment)
IMT () moves the plate inside the intake manifold, passing or blocking the sound pulses that are transmitted between the individual halves of the manifold. In fact, this results in a widening of the intake ducts and improved low-end torque. IMT valve (intake manifold adjustment) is a two-position valve and can only be in two states: fully open and fully closed. For more information, please refer to Intake Air Distribution and Filtering (303-12A)
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