RDX L4-2.3L Turbo (2008)
Vacuum Pump: Initial Inspection and Diagnostic Overview
General Troubleshooting Information
General Troubleshooting Information
System Indicator
This system has an electric vacuum pump system indicator (A).
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When the system detects a problem, the electric vacuum pump system indicator stays on.
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When the system is normal, the electric vacuum pump system indicator comes on after turning the ignition switch ON (II), then it goes off under
these conditions.
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Before starting the engine.
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After starting the engine.
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Pressing the brake pedal for the first time after starting the engine.
Diagnostic Trouble Code (DTC)
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The memory can hold any number of DTCs. However, when the same DTC is detected more than once, the more recent DTC is written over the
earlier one. Therefore, when the same problem is detected repeatedly, it is memorized as a single DTC.
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The DTCs are indicated in the order they occur.
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The DTCs are memorized in the PCM.
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The electric vacuum pump system DTCs are shown independently, and are treated as additional internal data by the PCM. Therefore, the electrical
vacuum pump system DTCs are canceled by disconnecting the battery.
Self-diagnosis
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Self-diagnosis can be classified into two categories:
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Initial diagnosis: Done when the ignition switch is turned ON (II), and until the electric vacuum pump system indicator goes off.
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Regular diagnosis: Done right after the initial diagnosis, until the ignition switch is turned OFF.
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When the system detects a problem, the system shifts to a fail-safe mode.
Pump Motor
The electric vacuum pump operates as needed. You can hear the motor function at times, this is normal. The pump motor operates under these
conditions:
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The system detects if the brake booster vacuum becomes low while the engine is running.
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After cold starting the engine, or when the outside temperature is very cool.
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At high altitude.
The pump motor turns off when the system detects the brake booster vacuum is sufficient. If the system detects a fault, it shifts to fail-safe mode, and
turns on the electric vacuum pump system indicator.
Relationship of the Fuel and Emissions Systems
The electric vacuum pump system is a part of the brake systems. Operation relies on information from sensors in the fuel and emission systems.
Review the general troubleshooting in the fuel and emissions systems section.
How to Troubleshoot DTCs
