On-Board Diagnosis System II - Volkswagen Technical Site
On-Board Diagnosis System II - Volkswagen Technical Site
On-Board Diagnosis System II - Volkswagen Technical Site
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<strong>System</strong> Components (Gasoline Engine)<br />
Throttle valve control unit J338<br />
Integrated in the throttle valve control unit in<br />
addition to driver's side throttle valve control are<br />
the idle speed control and the cruise control<br />
system (CCS) function.<br />
By using this compact unit, components such as<br />
the idle speed stabilization valve and the electropneumatic<br />
control unit for CCS are no longer<br />
necessary.<br />
The system detects deviations in idling<br />
characteristics as a result of aging, wear or air<br />
bleed points in the engine and compensates for<br />
them by adaption within specified boundaries.<br />
175_110<br />
Faults in component parts of the throttle<br />
valve control unit cannot be remedied<br />
individually.<br />
If the unit malfunctions, it must be<br />
replaced.<br />
The OBD <strong>II</strong> checks:<br />
● the electrical function of the components and<br />
● the function and limit of idle speed adaption.<br />
Procedure:<br />
The throttle valve control unit is monitored by the<br />
system within the framework of the<br />
Comprehensive Components <strong>Diagnosis</strong>.<br />
In addition, the values of the components are<br />
checked for plausibility.<br />
175_111<br />
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