Contents: Examination ⇓ Self-diagnosis ⇓
The MIL indicator lamp lights up when there are malfunctions in the engine management system. However, the MIL lamp will not light up after three engine starts if the previously detected malfunction does not occur again. After the ignition is turned on (before the engine is started), the indicator lamp lights up continuously, which indicates the normal operation of the diagnostic system of malfunctions. The indicator lamp with the "OBD–II" system lights up when malfunctions occur in the following system components:
- catalytic converter;
- fuel system;
- air flow meter;
- engine air temperature sensor;
- coolant temperature sensor;
- throttle position sensor;
- oxygen sensor;
- oxygen sensor heater;
- fuel injectors;
- misfires;
- crankshaft angle sensor;
- camshaft position sensor;
- fuel vapor recovery system;
- vehicle speed sensor;
- idle speed control valve;
- electrical power supply;
- ECM;
- malfunction of the gearbox;
- acceleration sensor;
- mIL signal request.
The control lamp without the "OBD-II" system lights up when faults occur in the following system elements:
- heated oxygen sensor;
- manifold absolute pressure sensor;
- throttle position sensor;
- coolant temperature sensor;
- modulator for controlling the engine idle speed;
- fuel injectors;
- ECM.
Examination
1. After turning on the ignition, the control lamp lights up for 5 seconds and then goes out.
2. If the test lamp does not light, check the lamp electrical circuit, the integrity of the fuse and the serviceability of the lamp.
Self-diagnosis
The ECM constantly monitors input and output signals and other signals under certain conditions. When a malfunction is detected, the ECM stores a diagnostic trouble code (DTC) in memory and outputs the code to the diagnostic connector. DTCs can be read using the MIL or the HI-SCAN scanner. DTCs remain in memory until the battery cables are disconnected or the connector is disconnected from the ECM, or until they are cleared using the HI-SCAN scanner.
Warning! If the connector is disconnected with the ignition on, a DTC will be stored in the memory. In this case, disconnect the negative battery cable for more than 15 seconds, which will erase the diagnostic memory.