Almost every car with an electronic engine management system is also equipped with a self-diagnosis system. If one of the sensors gives a reading to the computer that differs from the one provided by the program, an emergency one will be started, and a lamp on the car's display will light up, warning of a malfunction.
Instructions
Step 1
Connect a dial-up voltmeter to read the fault codes to the contacts signed on the diagram https://alflash.com.ua/CheckConMMC2.gif, respectively, under No. 1 and No. 12 of the connector. Then turn on the ignition. Read the number of oscillations of the voltmeter pointer. Pay attention to the duration of the voltage pulse, as well as the amount of time between them.
Step 2
You can also read fault codes by ear, if instead of a voltmeter you connect a generator with a piezoelectric emitter, for example, used as a buzzer. You can determine the trouble codes by the duration of the "squeaks".
Step 3
Read the codes recorded in the control system of a Japanese-made vehicle using a jumper. To do this, close contacts E1 and TE1 of the diagnostic connector. Typically, pin markings are applied to the connector housing. On VAZ cars, you can read the codes recorded by the ITMS controller. Use a test lamp, short-circuit contacts A and B, turn on the ignition.
Step 4
Read the error codes in the Nissan car, for them this procedure is somewhat more complicated, since the controller is located in a hard-to-reach place. The procedure must be performed from the LEDs that are located on the controller unit.
Step 5
Turn on the ignition, make sure that both diodes are on, then turn the knob responsible for selecting the mode with a screwdriver clockwise as far as it will go. The numbers 23, 24, then 31 will be displayed in turn.
Step 6
If there are more codes, write them down. Red signal means tens, green - ones. Thus, write down the received codes. After diagnostics, clear the system memory. To do this, disconnect the battery for a few tens of seconds.
