Monitor Description
OUTLINE OF DIAGNOSIS
Detect the malfunction of microcomputer (RAM).
If it is possible to write data to the whole area of RAM in the initial routine, and is possible to read the same data, it is judged as OK, and if not, NG.
EXECUTION CONDITION
DIAGNOSIS 1
| Secondary parameters | Execution condition |
|---|---|
| ECM initialization | RUN |
DIAGNOSIS 2
| Secondary parameters | Execution condition |
|---|---|
| None |
GENERAL DRIVING CYCLE
Perform the diagnosis immediately after ignition switch ON.
DIAGNOSTIC METHOD
Judge as NG when the following conditions are established.
Judgment value (diagnosis 1)
| Malfunction Criteria | Threshold Value |
|---|---|
| Written value to RAM | Not equal to the reading value |
Judgment value (diagnosis 2)
| Malfunction Criteria | Threshold Value |
|---|---|
| Check error of error correction code | Detected |
Time needed for diagnosis
2 times
Malfunction indicator light illumination
Illuminates as soon as a malfunction occurs.