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Subaru Legacy Service Manual: Dtc p2610 ecm/pcm engine off timer performance

DTC DETECTING CONDITION:

Detected when two consecutive driving cycles with fault occur.

CAUTION:

After servicing or replacing faulty parts, perform Clear Memory Mode Clear Memory Mode > OPERATION, and Inspection Mode Inspection Mode > PROCEDURE.

STEPCHECKYESNO

1.CHECK FOR ANY OTHER DTC ON DISPLAY.

Is any other DTC displayed-

Check DTC using “List of Diagnostic Trouble Code (DTC)”. List of Diagnostic Trouble Code (DTC)

Replace the ECM. Engine Control Module (ECM)

NOTE:

The soaking timer IC is built into the ECM.

1. OUTLINE OF DIAGNOSIS

Detect malfunction of soaking timer IC by the five diagnoses below.

Monitor Number

Explanation

Time required for diagnosis

Monitor #1

Perform diagnosis of the soaking timer IC accuracy

128 ms

Monitor #2

Perform diagnosis of the soaking timer IC counter function

128 ms

Monitor #3

Perform diagnosis of communication between ECM and soaking timer IC

128 ms

Monitor #4

Perform diagnosis of the soaking timer IC accuracy during soaking

None

Monitor #5

Perform diagnosis of wake-up function

None

2. COMPONENT DESCRIPTION

The soaking timer IC is built into the ECM.

3. EXECUTION CONDITION

Secondary Parameters

Execution condition

Battery voltage

≥ 10.9 V

Ignition switch

OFF

Elapsed time after starting the engine

> 600 s

and

< 61380 s

Battery voltage

≥ 10.9 V

Ignition switch

OFF

Counter in ECM

≥ 4 s

Battery voltage

≥ 10.9 V

Ignition switch

OFF

Battery voltage

≥ 10.9 V

Ignition switch

OFF

Ignition switch

ON

Time in the soaking timer IC

> 3600 s

4. GENERAL DRIVING CYCLE

Perform the diagnosis only once when the ignition switch is OFF and when the ignition switch is ON after the soaking of one hour or more.

5. DIAGNOSTIC METHOD

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.

Judge as NG when the following conditions are established.

Judgment Value

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.

Judge as NG when the following conditions are established.

Judgment Value

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.

Judge as NG when the following conditions are established.

Judgment Value

Malfunction Criteria

Threshold Value

Writing value and read out value when setting the soaking timer

Unmatch

Wake-up at the predetermined interval until 5 or 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 1636 ms, or if the counter in soaking timer IC is not counted up to maximum value (1023 count) when the counter in ECM is 2456 ms.

Judge as NG when the following conditions are established.

Judgment Value

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)

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.

Judge as NG when the following conditions are established.

Judgment Value

Malfunction Criteria

Threshold Value

Number of wake-up

≠ Wake-up indication count

Judge as NG when the following conditions are established.

Judgment Value

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.

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Caution
• When performing any work, always wear work clothes, a work cap and protective shoes. Additionally, wear a helmet, protective goggles, etc. if necessary.• When performing a repair, identify the cause of trouble and avoid unnecessary removal, disassembly and replacement.• Some vehi ...

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