Diagnostic Method

WARNING: This page is about a different variant/trim than selected.

Start the count up operation of counters in ECM and in soaking timer IC when the engine is started. Judge as timer malfunction if the difference between the counter in ECM and counter in soaking timer IC exceeds the allowable limit when the ignition switch is OFF.

Fig 1: ECM/PCM Engine Off Timer Timing Pattern (Timer Diagnosis)

Courtesy of SUBARU OF AMERICA, INC.

Judge as NG when the following conditions are established.

JUDGMENT VALUE SPECIFICATION

Malfunction Criteria	Threshold Value
\|osoaktimcpu - osoaktimic\|/osoaktimcpu osoaktimcpu = Counter in ECM osoaktimic = Counter in soaking timer IC	> 0.24

Reset the counter in soaking timer IC and start the count up operation.

Judge as full count diagnosis malfunction if counter in soaking timer IC is not $3FF (1023 count) after 4 seconds.

Fig 2: ECM/PCM Engine Off Timer Timing Pattern (Full Count Diagnosis)

Courtesy of SUBARU OF AMERICA, INC.

Judge as NG when the following conditions are established.

JUDGMENT VALUE SPECIFICATION

Malfunction Criteria	Threshold Value
osoakfcntic osoakfcntic = Counter in soaking timer IC	$3FF (1023 count)

When setting the activation setting time to soaking timer IC, compare the writing value to soaking timer IC with read out value. Judge as malfunction if the values do not match 3 times in a row.

Fig 3: ECM/PCM Engine Off Timer Timing Pattern (Soaking Timer IC Setting Diagnosis)

Courtesy of SUBARU OF AMERICA, INC.

Judge as NG when the following conditions are established.

JUDGMENT VALUE SPECIFICATION

Malfunction Criteria	Threshold Value
Writing value and read out value when setting the soaking timer	Unmatch

Wake-up at the predetermined interval until 5, 7 or 9.5 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 4: ECM/PCM Engine Off Timer Timing Pattern (Timer Diagnosis During Soaking)

Courtesy of SUBARU OF AMERICA, INC.

Judge as NG when the following conditions are established.

JUDGMENT VALUE SPECIFICATION

Malfunction Criteria	Threshold Value
When any one of the followings is established:
All of the following conditions are established. Counter in ECM	≤ 1636 ms
Counter in soaking timer IC	= $3FF (1023 count)
All of the following conditions are established.
Counter in ECM	≥ 2456 ms
Counter in soaking timer IC	$3FF (1023 count)

<WAKE-UP DIAGNOSIS>

Store the number of wake-up activation when the ECM wakes up by the soaking timer IC. Next time when the ignition switch is ON, if the number of wake-up activation does not reach the predetermined value even though the counter in soaking timer IC operates 1 hour or more, judge as wake-up malfunction.

Fig 5: ECM/PCM Engine Off Timer Timing Pattern (Wake Up Diagnosis)

Courtesy of SUBARU OF AMERICA, INC.

Judge as NG when the following conditions are established.

JUDGMENT VALUE SPECIFICATION

Malfunction Criteria	Threshold Value
Number of wake-up	< Wake-up indication count

Judge as NG when the following conditions are established.

JUDGMENT VALUE SPECIFICATION

Malfunction Criteria	Threshold Value
Ignition switch	ON
Driving cycle	Completed
When any one of the followings is established:
Timer diagnosis	NG
Full count diagnosis	NG
Soaking timer IC setting diagnosis	NG
Timer diagnosis (during soaking)	NG
Wake-up diagnosis	NG

Time Needed for Diagnosis: Approx. 5 - 9.5 hours

Malfunction indicator light illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.