Toyota Yaris: Manual Transaxle System / Diagnosis System

DIAGNOSIS SYSTEM

EURO-OBD (EUROPEAN SPEC)

(a) When troubleshooting Europe On-Board Diagnostic (Euro-OBD) vehicles, an OBD scan tool (complying with ISO 15765-4) must be connected to the vehicle. Various data output from the vehicle's ECM can then be read.

(b) Euro-OBD regulations require that the vehicle's on-board computer illuminate the Malfunction Indicator Lamp (MIL) on the instrument panel when the computer detects a malfunction in any of the following:

In addition, the applicable Diagnostic Trouble Codes (DTCs) prescribed by ISO 15765-4 are stored in the ECM memory. If the malfunction does not reoccur in 3 consecutive trips, the MIL turns off automatically but the DTCs remain stored in the ECM memory.

(c) To check for DTCs, connect the GTS or OBD 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 engine data.

The DTCs and freeze frame data can be cleared using the scan tool.

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FUNCTION OF WARNING INDICATOR AND MESSAGE

(a) If the iMT system is not functioning properly, the driver is warned by the iMT warning light or a warning message on the multi-information display in the combination meter assembly.

FREEZE FRAME DATA

The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was moving or stationary, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data stored at the time of a malfunction.

CHECK DATA LINK CONNECTOR 3 (DLC3)

(a) Check the DLC3.

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CHECK AUXILIARY BATTERY VOLTAGE

Standard voltage:

11 to 14 V

If the voltage is below 11 V, replace or recharge the auxiliary battery before proceeding to the next step.