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EC-48 < FUNCTION DIAGNOSIS > [VK56DE] ON BOARD DIAGNOSTIC (OBD) SYSTEM • Sea level • Flat road • Ambient air temperature: 20 - 30 °C (68 - 86°F) • Diagnosis is performed as quickly as possible under normal conditions. Under different conditions [For example: ambient air temperature other than 20 - 30 °C (68 - 86°F)], diagno- sis may also be performed. Pattern 1: • The engine is started at the engine coolant temperature of −10 to 35°C (14 to 95°F) (where the voltage between the ECM terminal 73 and ground is 3.0 - 4.3V). • The engine must be operated at idle speed until the engine coolant temperature is greater than 70 °C (158 °F) (where the voltage between the ECM terminal 73 and ground is lower than 1.4V). • The engine is started at the fuel tank temperature of warmer than 0 °C (32°F) (where the voltage between the ECM terminal 107 and ground is less than 4.1V). Pattern 2: • When steady-state driving is performed again even after it is interrupted, each diagnosis can be conducted. In this case, the time required for diagnosis may be extended. Pattern 3: • Operate vehicle following the driving pattern shown in the figure. • Release the accelerator pedal during decelerating vehicle speed from 90 km/h (56 MPH) to 0 km/h (0 MPH). Pattern 4: • The accelerator pedal must be held very steady during steady- state driving. • If the accelerator pedal is moved, the test must be conducted all over again. *1: Depress the accelerator pedal until vehicle speed is 90 km/h (56 MPH), then release the accelerator pedal and keep it released for more than 10 seconds. Depress the accelerator pedal until vehicle speed is 90 km/h (56 MPH) again. *2: Checking the vehicle speed with GST is advised. Suggested Transmission Gear Position Set the selector lever in the D position with the overdrive switch turned ON. TEST VALUE AND TEST LIMIT The following is the information specified in Service $06 of SAE J1979. The test value is a parameter used to determine whether a system/circuit diagnostic test is OK or NG while being monitored by the ECM during self-diagnosis. The test limit is a reference value which is specified as the maximum or minimum value and is compared with the test value being monitored. These data (test value and test limit) are specified by On Board Monitor ID(OBDMID), Test ID (TID), Unit and Scaling ID and can be displayed on the GST screen. The items of the test value and test limit will be displayed with GST screen which items are provided by the ECM. (eg., if the bank 2 is not applied on this vehicle, only the items of the bank 1 is displayed) PBIB2244E |