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Home >> Volkswagen >> 2005 >> Jetta TDI, Automatic >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 9 (1.9L - Fuel Injection Glow Plug, Engine Code ALH, From My 2002 (A4 Platform)) >> 01 On Board Diagnostic (OBD) >> Measured value blocks >> Evaluating Measured value blocks, at idle >> Evaluation: Cold start valve duty cycle display

Evaluation: Cold start valve duty cycle display

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VAG1551 display Possible cause of malfunction Corrective action
Below 50 or above 95 %
  • Cold Start Injector N108 inoperative
 
  • Injection pump timing severely incorrect
 
  • Air in fuel system
  • Check fuel supply system.
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