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

ENGINE (DIAGNOSTICS)(H4DO) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)

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

196 ms

Monitor #2

Perform diagnosis of the soaking timer IC counter function

4000 ms

Monitor #3

Perform diagnosis of communication between ECM and soaking timer IC

196 ms

Monitor #4

Perform diagnosis of the soaking timer IC accuracy during soaking

3000 ms

Monitor #5

Perform diagnosis of wake-up function

64 ms

2. COMPONENT DESCRIPTION

The soaking timer IC is built into the ECM.

3. EXECUTION CONDITION

Secondary Parameters

Execution condition

Battery voltage

≥ 10.9 V

Elapsed time after starting the engine

> 600 s

and

< 61380 s

Battery voltage

≥ 10.9 V

ECM counter

≥ 4 s

Battery voltage

≥ 10.9 V

Battery voltage

≥ 10.9 V

Soak time

> 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

| (ECM counter) − (Soak timer IC counter) |

/ ECM counter

> 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

Soak timer IC counter

≠ $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

Value commanded by the ECM

≠ Value received by the soak timer IC

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

Judge as NG when the following conditions are established.

Judgment Value

Malfunction Criteria

Threshold Value

Soak timer IC counter when ECM counter ≤ 1.636 sec

= 1023 count

Soak timer IC counter when ECM counter ≥ 2.456 sec

≠ 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 function commanded from ECM to Soak-timer IC

≠ Number of actual wake-up ECM

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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