RDX L4-2.3L Turbo (2008)
Vacuum Pump: Initial Inspection and Diagnostic Overview
System Description
System Description
System Requirement
Due to the addition of the turbocharger, the intake manifold vacuum can be reduced affecting the brake boost. To compensate for this loss of vacuum,
the electric vacuum pump is required.
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During cold engine starting; the fuel and emission system retards the ignition timing to help heat up the catalytic converter and the turbocharger
with high exhaust temperature. In this case, the vacuum pressure in the intake manifold is reduced, especially in high altitude areas where low
atmospheric density conditions create a long warm up condition.
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When the turbocharger system turbocharges the intake air, the intake manifold vacuum is reduced.
System Control
The electric vacuum pump controls the target vacuum of the brake booster compared to atmosphere pressure.
System Electrical Structure
The system has a brake booster pressure sensor, an electric vacuum pump, a electric vacuum pump system indicator in the gauge control module, and
the PCM with fuel and emission systems sensors.
