2. The powertrain control components (which affect vehicle emissions)
3. The computer.
In addition, the applicable Diagnostic Trouble Codes (DTCs) prescribed by SAE J2012 are recorded in the
ECM memory. If the malfunction does not reoccur in 3 consecutive trips, the MIL turns off automatically but
the DTCs remain recorded in the ECM memory.
Fig. 32: Identifying Malfunction Indicator Lamp
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
To check DTCs, connect the scan tool to the Data Link Connector 3 (DLC3) of the vehicle. The scan tool
displays DTCs, the freeze frame data and a variety of the engine data.
