Diagnostic Method

Judge as NG when the following conditions are established.

• Judgment 1: Diagnosis for open circuit 

  Judgment value 

  JUDGMENT VALUE SPECIFICATIONS
  
  

  Malfunction Criteria	Threshold Value
  High-pressure fuel pump wrong operation signal (0.2 A or less)	ON

• Judgment 2: Diagnosis for overcurrent 

  Judgment value 

  JUDGMENT VALUE SPECIFICATIONS
  
  

  Malfunction Criteria	Threshold Value
  High-pressure fuel pump wrong operation signal (14.2 A or more)	ON

• Judgment 3: Diagnosis for ground short 

  Judgment value 

  JUDGMENT VALUE SPECIFICATIONS
  
  

  Malfunction Criteria	Threshold Value
  High-pressure fuel pump wrong operation signal (1 V or less)	ON

• Judgment 4: Diagnosis for power supply short 

  Judgment value 

  JUDGMENT VALUE SPECIFICATIONS
  
  

  Malfunction Criteria	Threshold Value
  High-pressure fuel pump wrong operation signal (5 V or more)	ON

• Judgment 5: Diagnosis for ground short (between ECM and high-pressure fuel pump driver) 

  Judgment value 

  JUDGMENT VALUE SPECIFICATIONS
  
  

  Malfunction Criteria	Threshold Value
  High-pressure fuel pump control voltage	Less than 3.92 V

• Judgment 6: Diagnosis for power supply short (between ECM and high-pressure fuel pump driver) 

Judgment value 

Time needed for diagnosis: 

Judgment 1, 2, 5: Map1

Judgment 3, 4, 6: Map2

Map1 

Map2 

Malfunction indicator light illumination:  Illuminates as soon as a malfunction occurs.