Monitor Description
WARNING: This page is about a different car, the 2004 Toyota Corolla. However, it is still accessible from the selected car via links, so may be relevant.
The ECM continuously monitors its internal circuits. This self-check insures that the ECM is functioning properly. If a malfunction is detected, the ECM will set the appropriate DTC and illuminate the MIL.
The two CPUs, main and sub CPU inside the ECM, perform continuous mutual monitoring. If there is difference between outputs from the two CPUs that deviates from standard level ranges, the ECM concludes that there is a fault and sets a DTC.
DTC DETECTION CONDITION
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| P0606 | ECM internal error |
|