Attention! When disconnecting the wires from the battery, all recorded fault codes are erased!
Retrieving fault codes from memory
Remove the ALDL diagnostic connector (see arrow in fig.) from the socket. The ALDL connector is located behind the left shock absorber strut near the octane coding connector.
To recall a fault code from the computer's memory:
- if you have a diagnostic key: insert the KM-602-2 key into the sockets of contacts A and B;
- connect contact B with a piece of wire to the ground contact A.
Note: The contact designations are located on the connector body.
Warning! Contacts can be easily bent. Bad contacts in connections can damage the computer and cause memory failure. Therefore, it is necessary to pay special attention to the reliability of contacts.
Attention! Never connect terminal E ("+") to terminal A "ground", as this will cause a short circuit!
Turn on the ignition. The control lamp starts flashing, displaying the fault code.
The code is determined by a combination of flashes of the lamp and pauses between them. For example, code 131 is indicated as follows: a single flash, a pause, three quick flashes, a pause, a single flash, then a longer pause and a double repetition of the code.
First, code 12 is issued three times in a row, indicating that the code output mode is on (single flash, pause, two flashes, then (in 3 sec.) the code is repeated two more times).
After 3 seconds, fault codes start to appear (in the same way as described above).
Attention! The fault codes are issued in ascending order of their numbers. If only code 12 is issued, this means that there are no fault codes in the memory.
When the codes stop being issued, turn off the ignition.
Insert the diagnostic connector into the socket and put on the cover.
Attention! If the battery is disconnected from the vehicle's electrical system for more than 10 seconds, the fault codes in the computer's memory are erased. If the fault is not confirmed after 20 subsequent engine starts, the record of it is erased from the computer's memory.
Thus, if faults need to be erased from the memory (for example, after renovation), it is necessary to disconnect the ground wire from the battery for 10 seconds.
Checking system elements
The fault code indicates which element of the ignition system or injection system is faulty. To identify a specific fault, it is necessary to know the decoding of the codes of a specific ignition and injection system. Special diagnostic equipment is required to perform individual checks. Therefore, only general instructions for checking system elements are provided below. More complex work is carried out in specialized repair shops.
Attention! If the code indicates a faulty coolant temperature sensor, the fault may be in the computer itself. It can be established either by replacing the sensor or by conducting a series of tests using special equipment in a specialized workshop.
Disconnect the connector from the element whose malfunction is indicated by the code from the computer memory, check the connection for reliable contact, remove traces of corrosion (if any).
Check the reliability of the wire fastening in the connector.
Check the resistance of the element. In doing so, you should take into account (in case of low resistance of the element being tested) accuracy and internal resistance of the ohmmeter and its wires.
Check the integrity of the wires going to the computer using electrical diagrams. If the fault is "too low voltage", then first of all you should check the connection to the "ground", and if - "too high voltage", then this may be due to a wire break.
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