This procedure covers performing a diagnostic scan on a 2016-2024 Hyundai Tucson with the 2.5L I4 engine to retrieve diagnostic trouble codes (DTCs) and assess vehicle system health.

Warnings

Tools required

Preparation

1. Park the vehicle on level ground and engage the parking brake
2. Ensure the ignition is in the OFF position
3. Locate the OBD-II diagnostic port under the driver's side dashboard, just above the brake pedal area
4. Verify that all vehicle accessories are turned off to prevent interference during scanning
5. If the check engine light or other warning lights are illuminated, note which lights are on before beginning

Procedure

1. 1

   Connect the Diagnostic Scanner
   Plug the OBD-II diagnostic scanner connector firmly into the vehicle's diagnostic port located under the driver's side dashboard. Ensure the connection is secure and fully seated. The port is a 16-pin trapezoidal connector typically positioned to the left of the steering column.
2. 2

   Power On the Scanner
   Turn the vehicle ignition to the ON position (do not start the engine unless specifically testing running conditions). The scanner should power on automatically from the diagnostic port. If using a battery-powered or Bluetooth scanner, ensure it is powered on and properly paired with your device.
3. 3

   Initialize Vehicle Communication
   Select the correct vehicle information on the scanner: Year (2016-2024), Make (Hyundai), Model (Tucson), Engine (2.5L I4). Allow the scanner to establish communication with the vehicle's control modules. This may take 15-30 seconds. If communication fails, verify the ignition is on and the scanner connection is secure.
4. 4

   Scan Engine Control Module
   Navigate to the Engine Control Module (ECM/PCM) section and select 'Read Codes' or 'Scan for DTCs'. The scanner will retrieve all stored and pending diagnostic trouble codes. Record each code number (e.g., P0300, P0171) along with its description. Note whether codes are current, pending, or permanent.
5. 5

   Retrieve Freeze Frame Data
   For each stored DTC, access the freeze frame data which captures vehicle operating conditions at the time the fault was detected. Record key parameters such as engine RPM, coolant temperature, vehicle speed, fuel trim values, and sensor readings. This data is critical for accurate diagnosis.
6. 6

   Scan Additional Control Modules
   Perform a complete vehicle scan to check all available control modules including: Transmission Control Module (TCM), Anti-lock Brake System (ABS), Airbag/SRS module, Body Control Module (BCM), and AWD/4WD control module. Record any DTCs found in these systems with their descriptions.
7. 7

   Review Live Data Streams
   Access the live data function to monitor real-time sensor values and system parameters. For the 2.5L engine, check key parameters: oxygen sensor voltages, mass air flow (MAF) readings, throttle position, fuel trims (short and long term), engine coolant temperature, and intake air temperature. Compare values to known good specifications.
8. 8

   Check Readiness Monitors
   Navigate to the I/M Readiness Monitor screen to verify emission system monitor status. Record which monitors have completed their self-tests (Ready/Complete) and which are incomplete (Not Ready). For this vehicle, typical monitors include: Catalyst, Heated Catalyst, EVAP, O2 Sensor, O2 Heater, and EGR (if equipped).
   ℹ️Incomplete monitors may indicate recent code clearing or insufficient drive cycle completion. Vehicle may not pass emissions testing if monitors are not ready.
9. 9

   Document All Findings
   Create a comprehensive record of all diagnostic information retrieved: all DTCs from all modules, freeze frame data, failed monitor status, and any abnormal live data values. Note the current odometer reading and date. Take photos of the scanner screen if possible for future reference.
10. 10

    Disconnect Scanner and Complete
    Turn the ignition to the OFF position. Disconnect the diagnostic scanner from the OBD-II port. Store all recorded diagnostic information for analysis and repair planning. If codes were found, proceed with appropriate diagnostic procedures based on the specific DTCs retrieved.

Reassembly

1. No reassembly required for diagnostic scan procedure
2. Ensure the OBD-II port cover (if equipped) is reinstalled after disconnecting the scanner

Verification

• Confirm all diagnostic trouble codes and freeze frame data have been properly documented
• Verify the scanner was able to communicate successfully with all expected vehicle control modules
• Review readiness monitor status to determine if the vehicle has completed all self-diagnostic tests
• If no codes are present but a warning light is illuminated, verify the correct modules were scanned and consider using manufacturer-specific diagnostic equipment

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