Fig. 222: Intake Manifold Tuning Sensor Output Characteristics
General Description
The intake manifold tuning (IMT) system controls engine output by selecting either long or short intake
runner lengths. The system consists of the IMT valve, the IMT actuator, and the powertrain control module
(PCM). The IMT actuator is attached to the intake manifold and it includes the motor and the Hall-effect-IC
position sensing unit. The PCM actuates the motor, which operates the IMT valve. When the IMT valve is
closed, the long runner is selected, increasing torque at low engine speed. When the IMT valve is open, the
short runner is selected, increasing torque at high engine speed. A Hall-effect-IC position sensing unit is
integrated with the motor to provide precise open/close feedback to the PCM. The IMT actuator sends a
long runner return signal to the PCM when the IMT valve is closed, and it sends a short runner return signal
when the IMT valve is open.
If the PCM receives no closed return signal when it sends a close command, or if it receives no open return
signal when sending an open command to the IMT actuator, for a specified time, it detects a malfunction
and stores a DTC.
Monitor Execution, Sequence, Duration, DTC Type, OBD Status
MONITOR DESCRIPTION CHART
Execution
Once per driving cycle
2007 Acura RL
2007 ENGINE PERFORMANCE Advanced Diagnostics - RL
me
Friday, June 05, 2009 2:32:06 PM
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