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PGM-FI System Description - Electronic Control
The powertrain control module (PCM) consists of a CPU memory (storage unit) and inputs/outputs that control the fuel injection, injection timing, and electronic throttle control system (ETCS). Fail-Safe Function
When a malfunction occurs in the signal from a sensor or from another control unit, the PCM ignores that signal and substitutes a pre-programmed value that allows the engine to continue running. This causes a Confirmed DTC to be stored and the MIL to come on. Updated Function
The PCM has a rewritable ROM. The ROM can acquire the latest software version. MIL Bulb Check
When the vehicle is turned to the ON mode, the PCM turns on the MIL via the F-CAN circuit for about 15 to 20 seconds to check the bulb condition. USA and Canada models: If any readiness codes are not set to complete, the MIL flashes five times. If all readiness codes are set to complete, the MIL goes off. Self Shut Down (SSD)
After the vehicle is turned to the OFF (LOCK) mode, the PCM stays on for up to 900 seconds. If a PCM connector is disconnected during this time, the PCM may be damaged. To cancel this mode, disconnect the negative cable from the 12 volt battery. Two Drive Cycle Detection Method
The DTCs are detected with the one or two driving cycle method in the PCM. Specific DTCs which are considered as a not intermittent failure apply the two driving cycle method. When a malfunction occurs in the signal from a sensor or from another control unit in the first drive cycle, the PCM stores a pending DTC. The MIL does not come on at this time. If the failure continues in the second drive cycle, the PCM stores a confirmed DTC and turns on the MIL. |