< Timer diagnosis (during soaking) >

Wake-up at the predetermined interval until five hours have passed after the ignition switch is OFF, and compare the counter in soaking timer IC with the counter in ECM.

Judge as malfunction if the counter in soaking timer IC is counted up to maximum value (1023 count) when the counter in ECM is 1637 ms, or if the counter in soaking timer IC is not counted up to maximum value (1023 count) when the counter in ECM is 2455 ms.

Fig 1: ECM/PCM Internal Engine Diagnostic Chart - Timer Diagnosis (During Soaking)

Courtesy of SUBARU OF AMERICA, INC.

• Abnormality Judgment 

  Judge as NG when the following conditions are established.

  JUDGMENT VALUE REFERENCE CHART
  
  

  Malfunction Criteria	Threshold Value
  When any one of the followings is established.
  All of the following conditions are established. Counter in ECM	≤ 1637 ms
  Counter in soaking timer IC	= $3FF (1023 count)
  All of the following conditions are established. Counter in ECM	≥ 2455 ms
  Counter in soaking timer IC	$3FF (1023 count)

• Normality Judgment 

  Judge as OK when the following conditions are established.

  JUDGMENT VALUE REFERENCE CHART
  
  

  Malfunction Criteria	Threshold Value
  Following conditions are established.
  All of the following conditions are established. Counter in ECM	< 1637 ms
  Counter in soaking timer IC	$3FF (1023 count)
  All of the following conditions are established. Counter in ECM	≥ 2455 ms
  Counter in soaking timer IC	= $3FF (1023 count)