Reading fault codes without a code reader (Hyundai Elantra J1)

Caution: Additional fault codes may be generated when performing certain testing procedures. Care must be taken to ensure that the codes issued during checks do not mislead the inspector. After completing the checks, all codes must be erased.

Reading with a voltmeter

Connect an analog voltmeter between contacts A and B of the self-diagnosis system connector (1).



Turn on the ignition.

If there are one or more fault codes in the memory of the electronic control unit, the voltmeter needle will begin to fluctuate between high and low values. If there are no codes, the arrow will be stationary. The arrow's oscillations can be interpreted as follows:

• the first series of oscillations determines the number of tens, and the second series of oscillations determines the number of units of the code;
• the voltmeter needle will deflect more strongly when displaying tens, and when displaying units of code it will deflect for a shorter time. If there are no codes, the device will show regular on/off pulses

Count the number of oscillations in each series and write down each code as it appears. The meanings of the codes are given in the table at the end of the chapter



To complete reading the fault codes, turn off the ignition and disconnect the voltmeter.

Reading with LED probe

Connect the LED tester between terminals A and B of the self-diagnosis system connector.

(This article is based on information from the website www.HyundaiBook.ru)



Turn on the ignition.

After approximately 3 seconds, the codes will start to appear on the LED as 2-digit flash codes as follows:

• two digits of the code are determined by two series of flashes;
• the first series of flashes determines the number of tens, and the second - the number of units of the code number;
• the number of tens is determined by 1.5-second flashes separated by 0.5-second pauses, the number of units is determined by 0.5-second flashes separated by 0.5-second pauses;
• A 2-second pause separates the tens from the units;
• code 42 is defined by four 1.5-second flashes, a 2-second pause, followed by two 0.5-second flashes.

Count the number of flashes in each series and record each code as it appears. The meanings of the codes are given in the table at the end of the chapter.



The codes will be issued sequentially in ascending order and will be repeated after a 3-second pause

Eight on/off pulses of 0.5 second duration, repeated after a 3-second pause, mean that there are no more faults. To complete reading of fault codes, turn off the ignition and remove the tester.

Reading using the self-diagnosis system indicator lamp

Turn on the ignition.



Install a jumper wire (C) between terminals A and B of the self-diagnosis system connector.

After approximately 3 seconds, the codes will start to be displayed as 2-digit codes by flashing the self-diagnosis indicator lamp in the same way as by flashing a separate LED (see above).

To complete reading of fault codes, turn off the ignition and remove the jumper wire.