Honda Element. Manual — part 536

Fig. 39: Driving Condition Graph
Courtesy of AMERICAN HONDA MOTOR CO., INC.

VTC System

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The VTC system makes continuous intake valve timing changes based on operating conditions.

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Intake valve timing is optimized to allow the engine to produce maximum power.

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Cam angle is advanced to obtain the EGR effect and reduce pumping loss. The intake valve is closed
quickly to reduce the entry of the air/fuel mixture into the intake port and improve the charging effect.

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The system reduces the cam advance at idle, stabilizes combustion, and reduces engine speed.



If a malfunction occurs, the VTC system control is disabled, and the valve timing is fixed at the fully
retarded position.

2007 Honda Element EX

2007-2008 ENGINE PERFORMANCE Fuel and Emissions Systems - Element

Fig. 40: VTC System Waveform Graph
Courtesy of AMERICAN HONDA MOTOR CO., INC.

VTEC System



The VTEC system changes the cam profile to correspond to the engine speed. It maximizes torque at low
engine speed and output at high engine speed.

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The low lift cam is used at low engine speeds, and the high lift cam is used at high engine speeds.

Fig. 41: VTEC System Waveform Graph
Courtesy of AMERICAN HONDA MOTOR CO., INC.

VTEC/VTC

System Diagram

2007 Honda Element EX

2007-2008 ENGINE PERFORMANCE Fuel and Emissions Systems - Element

Fig. 42: VTEC/VTC System Diagram
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Camshaft Position (CMP) Sensor A

This sensor detects camshaft angle position for the VTC system.

Fig. 43: Sectional View Of Camshaft Position (CMP) Sensor A
Courtesy of AMERICAN HONDA MOTOR CO., INC.

2007 Honda Element EX

2007-2008 ENGINE PERFORMANCE Fuel and Emissions Systems - Element

IDLE CONTROL SYSTEM

When the engine is cold, the A/C compressor is on, the transmission is in gear, the brake pedal is pressed, the
power steering load is high, or the alternator is charging, the ECM/PCM controls the throttle position to
maintain the correct idle speed. Refer to the SYSTEM DIAGRAM to see a functional layout of the system.

Brake Pedal Position Switch

The brake pedal position switch signals the ECM/PCM when the brake pedal is pressed.

Power Steering Pressure (PSP) Switch

The PSP switch signals the ECM/PCM when the power steering load is high.

FUEL SUPPLY SYSTEM

Fuel Cutoff Control

During deceleration with the throttle valve closed, current to the injectors is cut off to improve fuel economy at
engine speeds over 1,000 rpm. Fuel cutoff control also occurs when the engine speed exceeds 6,700 rpm,
regardless of the position of the throttle valve, to protect the engine from over-revving. When the vehicle is
stopped, the ECM/PCM cuts the fuel at engine speeds over 5,000 rpm (M/T: 6,700 rpm). Fuel cutoff rpm is
lower on a cold engine.

Fuel Pump Control

When the ignition is turned on, the ECM/PCM grounds PGM-FI main relay 2 (FUEL PUMP) which feeds
current to the fuel pump for 2 seconds to pressurize the fuel system. With the engine running, the ECM/PCM
grounds PGM-FI main relay 2 (FUEL PUMP) and feeds current to the fuel pump. When the engine is not
running and the ignition is on, the ECM/PCM cuts ground to PGM-FI main relay 2 (FUEL PUMP) which cuts
current to the fuel pump.

PGM-FI Main Relay land 2

PGM-FI main relay 1 (Fl MAIN) is energized whenever the ignition switch is ON (II) to supply battery voltage
to the ECM/PCM, power to the injectors, and power for PGM-FI main relay 2 (FUEL PUMP). PGM-FI main
relay 2 (FUEL PUMP) is energized to supply power to the fuel pump for 2 seconds when the ignition switch is
turned ON (II), and when the engine is cranking or running.

INTAKE AIR SYSTEM

The system supplies air for engine needs.

Intake Air Bypass Control Thermal Valve

When the engine is cold, the intake air bypass control thermal valve sends air to the injector.

The amount of air is regulated by engine coolant temperature. Once the engine is hot, the intake air bypass

2007 Honda Element EX

2007-2008 ENGINE PERFORMANCE Fuel and Emissions Systems - Element