- 1. The engine starts with difficulty or does not start at all;
- 2. Unstable idling;
- 3. The engine does not develop full power.
In the event of any of these malfunctions, first check through the self-diagnosis, and then the basic engine check operations, (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 connecting the battery wire while the engine is running at «Included» ignition switch can cause damage to the engine control module (MUD)
The engine control module monitors the input and output signals (for some signals constantly, and for others in specific conditions). At the same time, the MUD detects any malfunction entered in the memory of the diagnostic trouble code and sends a signal to the self-diagnosis output. The diagnostic results of 15 objects can be read using a voltmeter or a scanning device. 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.
Verification Procedures (self-diagnosis)
Note:
- 1) If the battery voltage is low, diagnostic trouble codes cannot be read. Therefore, before testing, check the battery voltage and other conditions.
- 2) The DTC clears if the battery or engine control module connector is disconnected. Therefore, do not disconnect the battery before the DTCs are fully read.
Check operation (using a scanning device)
1. Turn the ignition switch to position «turned off».
2. Connect the scan tool to the socket 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. Connect a voltmeter to the data line connector (see picture).
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 has been repaired, disconnect the battery drive negative lead for 15 seconds or more and reconnect it to ensure that the DTC is cleared.