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The system self-diagnostics and fault codes

Testing Equipment

To test fuel injection systems and emission control is necessary to use digital versatile test instruments, as they have greater accuracy and greater resistance to the inner loop.

Hand-held scanners are the most comfortable and versatile devices for checking the operation of the engine control systems on models later model years.

System OBD-I (model till 1995 of release)

The electronic control unit has a built-in self-test (On Board Diagnosis (OBD) system), which is used to troubleshoot the system and includes the engine control lamp on the dashboard in the event of fault detection. The DTC is stored in the memory of the electronic control unit and is available for reading.

Reading DTC systems OBD-I

For reading recorded in the memory of the electronic control unit fault codes to connect terminals and GND STI diagnostic socket connection.

Connect a voltmeter to terminal STO and "weight" of the car. Turn the ignition on and count the number of needle deflection or control light flashes engine. For example, the code 34 will be displayed as a flashing light bulb 3 long pause, 4 short flashes.

Cleaning the DTC system OBD-I

To clear DTCs disconnect the negative terminal of the battery and depress the brake pedal for more than 5 seconds.

DTC systems OBD-I (1993-1995 model release, except models 1994 and 1995 model years with a 4-cylinder engine and automatic transmission)

DTC systems OBD-I (models 1994 and 1995 model years with a 4-cylinder engine and automatic transmission)

System OBD-II (model year 1996)

Diagnostic connector connection system OBD-II

The connector is located under the dashboard on the driver's side.

Models with model year 1996 have a system of self-diagnostics of the second generation OBD-II. Access to the electronic control unit of the system can only be obtained by a special scanner to be connected to the 16-pin diagnostic socket connection located under the dashboard. When a fault is detected the electronic control unit includes a signal lamp on the instrument panel and stores the fault code in memory.

Reading DTC system OBD-II

For reading fault codes OBD-II systems use a special scanner to be connected to the diagnostic socket connection. If the scanner does not need to refer to specialists.

Cleaning the DTC system OBD-II

To clear fault codes OBD-II system is necessary to use a special scanner.

DTC system OBD-II