Electronic Control System: Self-diagnosis
WARNING: This page is about a different car, the 2009 Honda S2000, 2008 Honda S2000, 2007 Honda S2000, and 2006 Honda S2000. However, it is still accessible from the selected car via links, so may be relevant.
The ECM detects a failure of a signal from a sensor or from another control unit and stores a Temporary DTC or a DTC. Depending on the failure, a DTC is stored in the either first or the second drive cycle. When a DTC is stored, the ECM turns on the malfunction indicator lamp (MIL) by supplying ground to the MIL circuit.
- One Drive Cycle Detection Method
When an abnormality occurs in the signal from a sensor or from another control unit, the ECM stores a DTC and turns on the MIL.
- Two Drive Cycle Detection Method
When an abnormality occurs in the signal from a sensor or from another control unit in the first drive cycle, the ECM stores a Temporary DTC. The MIL does not come on at this time. If the failure continues in the second drive cycle, the ECM stores a DTC and turns on the MIL.