Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
1999 Hyundai Tiburon L4-2.0LFACTORY OEM SERVICE PROCEDURE
With Generic Scan Tool
SELF-DIAGNOSIS
The ECM monitors the input/output signals (some signals at all times and the others under specified conditions). When the ECM detects that an irregularity, it memorizes the diagnostic trouble code, and outputs the signal to the self-diagnosis output terminal.
The diagnosis results can be read using a Scan Tool (ST). Diagnostic trouble codes (DTC) will remain in the ECM as long as battery power is maintained. The diagnostic trouble code will, however, be erased when the battery terminal or the engine control module (ECM) connector is disconnected or erased by Generic Scan Tool.
CHECKING PROCEDURE (SELF-DIAGNOSIS)
NOTE:
A. When battery voltage is low, diagnostic trouble codes can not be read. Be sure to check the battery for voltage and other conditions before starting the test.
B. Diagnosis memory is erased if the battery or the ECM connector is disconnected. Do not disconnect the battery before the diagnostic trouble codes are completely read and recorded.
Inspection Procedure / Using Generic Scan Tool
1. Turn OFF the ignition switch.
2. Connect the scan tool to the data link connector in the coin box.
3. Turn ON the ignition switch.
4. Use the scan tool to check the diagnostic trouble code.
5. Repair the faulty part from the diagnosis chart.
6. Erase the diagnostic trouble code.
7. Disconnect the scan tool.
The ECM monitors the input/output signals (some signals at all times and the others under specified conditions). When the ECM detects that an irregularity, it memorizes the diagnostic trouble code, and outputs the signal to the self-diagnosis output terminal.
The diagnosis results can be read using a Scan Tool (ST). Diagnostic trouble codes (DTC) will remain in the ECM as long as battery power is maintained. The diagnostic trouble code will, however, be erased when the battery terminal or the engine control module (ECM) connector is disconnected or erased by Generic Scan Tool.
CHECKING PROCEDURE (SELF-DIAGNOSIS)
NOTE:
A. When battery voltage is low, diagnostic trouble codes can not be read. Be sure to check the battery for voltage and other conditions before starting the test.
B. Diagnosis memory is erased if the battery or the ECM connector is disconnected. Do not disconnect the battery before the diagnostic trouble codes are completely read and recorded.
Inspection Procedure / Using Generic Scan Tool
1. Turn OFF the ignition switch.
2. Connect the scan tool to the data link connector in the coin box.
3. Turn ON the ignition switch.
4. Use the scan tool to check the diagnostic trouble code.
5. Repair the faulty part from the diagnosis chart.
6. Erase the diagnostic trouble code.
7. Disconnect the scan tool.
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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