DTC P1510: ISC Solenoid Valve Signal #1 Circuit Malfunction (Low Input)

• Detect the open/short circuit of idle air control solenoid valve.
• Judge NG when the output terminal is Low level even though ECM outputs OFF signal.

Perform the diagnosis when starter switch is OFF.

• Abnormality Judgment 

  Judge NG when the cumulative time until completing the malfunction criteria below becomes more than time needed for diagnosis.

  Judgment Value 

  JUDGMENT VALUE
  
  

  Malfunction Criteria	Threshold Value
  Terminal voltage level when ECM outputs OFF signal	Low level

  Time Needed for Diagnosis:  0.5 seconds

  Malfunction Indicator Light Illumination:  Illuminates as soon as malfunction occurs.

• Normality Judgment 

  Judge OK and clear the NG when the malfunction criteria below are completed.

  Judgment Value 

  JUDGMENT VALUE
  
  

  Malfunction Criteria	Threshold Value
  Terminal voltage level when ECM outputs OFF signal	High level

• When the OK idling cycle is completed 40 times in a row
• When "Clear Memory" was performed

• When the OK driving cycle was completed 3 times in a row
• When "Clear Memory" was performed

• Cut the fuel of all cylinders, #1 cylinder or #1, #2 cylinder according to throttle position, engine speed, vehicle speed.
• ISC closed loop compensation value becomes zero. [ISCCL = 0 (l/min)]

Memorize the freeze frame data. (For test mode $02)