Diagnostic Method
Monitor#l <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.
Judge as NG when the following conditions are established.
| Malfunction Criteria | Threshold Value |
|---|---|
| |Counter in ECM - Counter in soaking timer ICI| Counter in ECM | More than 0.24 |
Monitor#2 <Full count diagnosis>
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 the specified value after 4 seconds.
Judge as NG when the following conditions are established.
| Malfunction Criteria | Threshold Value |
|---|---|
| Counter in soaking timer IC | Not equal to 65535 counts |
Monitor#3 <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.
Judge as NG when the following conditions are established.
| Malfunction Criteria | Threshold Value |
|---|---|
| Writing value and read out value when setting the soaking timer | Unmatch |
Monitor#4 <Timer diagnosis (during soaking)>
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 when the counter in ECM is 1636 ms, or if the counter in soaking timer IC is not counted up to maximum value when the counter in ECM is 2456 ms.
Judge as NG when the following conditions are established.
| Malfunction Criteria | Threshold Value |
|---|---|
| Counter in ECM | 1636 ms or less |
| Counter in soaking timer IC | 65535 counts |
| Or, | |
| Counter in ECM | 2456 ms or more |
| Counter in soaking timer IC | Not equal to 65535 counts |
Monitor#5 <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 1hour or more, judge as wake-up malfunction.
Judge as NG when the following conditions are established.
| Malfunction Criteria | Threshold Value |
|---|---|
| Number of wake-up | Not equal to wake-up indication count |
Time needed for diagnosis:
Monitor# 1: 0.128 s
Monitor#2: 0.128 s
Monitor#3: 0.128 s
Monitor#4: Less than 1s
Monitor# 5: Less than 1s
Malfunction indicator light illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.