P2610

DTC P2610 ECM/PCM INTERNAL ENGINE OFF TIMER PERFORMANCE

1. OUTLINE OF DIAGNOSIS
Detect malfunction of soaking timer IC by the five diagnoses below.






2. COMPONENT DESCRIPTION
The soaking timer IC is built into the ECM.

3. ENABLE CONDITIONS






4. GENERAL DRIVING CYCLE
Perform the diagnosis only once when 10 minutes have passed after the engine start and the ignition switch is OFF, and also when the ignition switch is ON after the soaking of five hours or more.

5. DIAGNOSTIC METHOD

[Timer diagnosis]
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.






- Abnormality Judgment
Judge as NG when the following conditions are established.






- Normality Judgment
Judge as OK when the following conditions are established.






[Full count diagnosis]
After the timer diagnosis is completed, 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.






- Abnormality Judgment
Judge as NG when the following conditions are established.






- Normality Judgment
Judge as OK when the following conditions are established.






[Soaking timer IC setting diagnosis]
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.






- Abnormality Judgment
Judge as NG when the following conditions are established.






- Normality Judgment
Judge as OK when the following conditions are established.






[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.






- Abnormality Judgment
Judge as NG when the following conditions are established.






- Normality Judgment
Judge as OK when the following conditions are established.






[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 exceeds the activation setting time, judge as wake-up malfunction.






- Abnormality Judgment
Judge as NG when the following conditions are established.






- Normality Judgment
Judge as OK when the following conditions are established.






- Abnormality Judgment
Judge as NG when the following conditions are established.






Time Needed for Diagnosis: 18620 s (Approx. 5 hours)
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.

- Normality Judgment
Judge as OK and clear the NG if the following conditions are established.






Time Needed for Diagnosis: 18620 s (Approx. 5 hours)