Diagnostic Method
- Monitor#1 <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.
JUDGMENT VALUE SPECIFICATIONMalfunction Criteria Threshold Value |osoaktimcpu - osoaktimic|/osoaktimcpu
osoaktimcpu = Counter in ECM
osoaktimic = Counter in
soaking timer ICMore 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.
JUDGMENT VALUE SPECIFICATIONMalfunction Criteria Threshold Value osoakfcntic
osoakfcntic = Counter in soaking timer ICNot 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.
JUDGMENT VALUE SPECIFICATIONMalfunction 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.
JUDGMENT VALUE SPECIFICATIONMalfunction Criteria Threshold Value When any one of the followings is established: - All of the following conditions are established.
Counter in ECM
Counter in soak timer IC
- All of the following conditions are established.
Counter in ECM
Counter in soak timer IC
1636 ms or less
65535 counts 2456 ms or more
Not equal to 65535 counts - All of the following conditions are established.
- 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 1 hour or more, judge as wake-up malfunction.
Judge as NG when the following conditions are established.
JUDGMENT VALUE SPECIFICATIONMalfunction 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 1 s
Monitor#5: Less than 1 s
Malfunction indicator light illumination : Illuminates when malfunction occurs in 2 continuous driving cycles.