- 1. The engine is difficult to start or does not start at all
- 2. Erratic idle
- 3. The engine does not develop full power.
In the event of any of these faults, first perform a self-diagnosis check and then a basic engine check (correct adjustment of the engine, ignition system, etc.), and then check the system components with a scan tool.
Note:
- 1) Before removing or installing any part, read the DTC and then disconnect the negative battery terminal.
- 2) Before disconnecting the battery terminal, turn the ignition switch to the «Turned off». Removing or attaching a battery drive while the engine is running at position «Turned off» ignition switch can cause damage to the engine control module (MUD).
Malfunction indicator lamp
The malfunction indicator lamp is designed to alert the driver to a defect in the exhaust gas cleaning system. After the onset of the normal state, the lamp goes out. After the ignition switch is turned on, the lamp lights up and stays on for 5 seconds.
Objects indicated by the control lamp:
- Heated oxygen sensor (NO2D)
- Air flow sensor (VAF)
- intake air temperature sensor (IAT)
- Throttle position sensor (TP)
- Engine coolant temperature sensor (EATING)
- crankshaft position sensor (TFR)
- Camshaft position sensor (SMR)
- nozzles
- Fuel pump
- Temperature sensor in the exhaust gas recirculation system
- Vehicle speed sensor
- Barometric pressure sensor
- Ignition coil.
Self-diagnosis
The engine control module monitors input/output signals (for some signals constantly, and for others in specific conditions).
At the same time, the MUD detects any malfunction entered into the memory of the diagnostic trouble code and sends a signal to the self-diagnosis output of 15 objects. Diagnostic results can be read using a voltmeter or scan tool.
Diagnostic Trouble Codes (DTCs) remain in the module while the battery is operating. If the battery lead or connector is disconnected, this will clear the trouble codes.
Check operation (using a scanning device)
1. Turn the ignition switch to position «turned off».
2. Connect the scan tool to the connector in the fuse box.
3. Connect the power supply lead of the scanner to the cigarette lighter.
4. Turn the ignition switch to position «included».
5. Use a scan tool to check for diagnostic trouble codes.
6. Repair the defective part according to the diagnostic card.
7. Erase the diagnostic trouble code.
8. Disconnect the scan tool.
Check operation (using a voltmeter)
1. Attach a voltmeter to the data line connector.
2. Turn on the ignition switch, the data from the memory of the ECU will start to be output.
After recording the defective object, check and repair it according to «diagnostic card».
3. After the defective part is repaired, disconnect the negative battery terminal for 15 seconds or more and reconnect it to ensure that the DTC is cleared.