On Board Diagnosis Function
ON BOARD DIAGNOSIS ITEM
The on board diagnostic system has the following functions.
| Diagnostic test mode | Function |
|---|---|
| Bulb check | MIL can be checked. |
| SRT status | ECM can read if SRT codes are set. |
| Malfunction warning | If ECM detects a malfunction, it illuminates or blinks MIL to inform the driver that a malfunction has been detected. |
| Accelerator pedal released position learning | ECM can learn the accelerator pedal released position. Refer to Description . |
| Throttle valve closed position learning | ECM can learn the throttle valve closed position. Refer to Description . |
BULB CHECK MODE
Description
This function allows damage inspection in the MIL bulb (blown, open circuit, etc.).
Operation Procedure
- Turn ignition switch ON.
- The MIL on the instrument panel should stay ON. If it remains OFF, check MIL circuit. Refer to Diagnosis Procedure .
SRT STATUS MODE
Description
This function allows to read if ECM has completed the self-diagnoses of major emission control systems and components. For SRT, refer to System Readiness Test (SRT) Code .
Operation Procedure
- Turn ignition switch ON and wait 20 seconds.
- SRT status is indicated as shown blow.
- ECM continues to illuminate MIL if all SRT codes are set.
- ECM blinks MIL for about 10 seconds if all SRT codes are not set.
MALFUNCTION WARNING MODE
Description
In this function ECM turns on or blinks MIL when it detects a malfunction in the emission control system components and/or the powertrain control components (which affect vehicle emissions) to inform the driver that a malfunction has been detected.
Operation Procedure
- Turn ignition switch ON.
- Check that MIL illuminates. If it remains OFF, check MIL circuit. Refer to Diagnosis Procedure .
- Start engine and let it idle.
- For two trip detection logic diagnoses, ECM turns on MIL when it detects the same malfunction twice in the two consecutive driving cycles. (2 trip detection logic diagnoses)
- For 1st trip detection logic diagnoses, ECM turns on MIL when it detects a malfunction in one driving cycle.
- ECM blinks MIL when it detects a malfunction that may damage the three way catalyst (misfire).