- catalytic converter;
- fuel system;
- air flow meter;
- temperature sensor of the air entering the engine;
- coolant temperature sensor;
- throttle position sensor;
- oxygen sensor;
- oxygen sensor heater;
- fuel injectors;
- misfiring;
- crankshaft angle sensor;
- camshaft position sensor;
- fuel vapor recovery system;
- vehicle speed sensor;
- idle speed control valve;
- electrical supply;
- ECM;
- malfunction of the gearbox;
- acceleration sensor;
- MIL request.
Pilot lamp without system "OBD-II" lights up when there are malfunctions in the following elements of the system:
- heated oxygen sensor;
- absolute pressure sensor in the intake manifold;
- throttle position sensor;
- coolant temperature sensor;
- the engine crankshaft speed control modulator at idle;
- fuel injectors;
- ECM.
Examination
1. After switching on the ignition, the control lamp lights up for 5 seconds, after which it goes out.
2. If the test lamp does not light up, check the lamp 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 DTC in memory and provides a code output to the diagnostic connector. Diagnostic codes can be read using the MIL or HI-SCAN scanner. Diagnostic codes remain in the memory until the wires are disconnected from the battery terminals or the connector is disconnected from the ECM, and until they are erased 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 cable from the negative terminal of the battery for more than 15 seconds, as a result of which the diagnostic memory will be erased.