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.
How to Use the HDS or a Scan Tool
2004 Honda S2000 L4-2.2LSECTION How to Use the HDS or a Scan Tool
How to Use the HDS or a Scan Tool
If the MIL (Malfunction Indicator Lamp) has come on
1. Start the engine and check the MIL.
2. If the MIL stays on, connect the HDS (A) or an OBD II scan tool to the data link connector (DLC) (B). For'00-01 models, the DLC is located under the passenger's side of the dashboard. For '02-04 models, the DLC is located behind the driver's side of the front console.
3. Turn the ignition switch ON (II).
4. Check the diagnostic trouble codes (DTC) and note it. Then also check the freeze frame data. Refer to the DTC Troubleshooting Index and begin the appropriate troubleshooting procedure. Diagnostic Trouble Code Descriptions
NOTE:
- Freeze data indicates the engine conditions when the first malfunction, misfire or fuel trim malfunction was detected.
- The scan tool and the HDS can read the DTC, freeze frame data, current data, and other engine control module (ECM) data.
- For specific operations, refer to the user's manual that came with a scan tool or HDS.
If the MIL did not come on
If the MIL did not come on but there is a driveablility problem, refer to the Symptom Troubleshooting. Symptom Related Diagnostic Procedures
If you can't duplicate the DTC
Some of the troubleshooting in this section requires you to reset the ECM and try to duplicate the DTC. If the problem is intermittent and you can't duplicate the code, do not continue through the procedure. To do so will only result in confusion and, possibly, a needlessly replaced ECM.
If the MIL (Malfunction Indicator Lamp) has come on
1. Start the engine and check the MIL.
2. If the MIL stays on, connect the HDS (A) or an OBD II scan tool to the data link connector (DLC) (B). For'00-01 models, the DLC is located under the passenger's side of the dashboard. For '02-04 models, the DLC is located behind the driver's side of the front console.
3. Turn the ignition switch ON (II).
4. Check the diagnostic trouble codes (DTC) and note it. Then also check the freeze frame data. Refer to the DTC Troubleshooting Index and begin the appropriate troubleshooting procedure. Diagnostic Trouble Code Descriptions
NOTE:
- Freeze data indicates the engine conditions when the first malfunction, misfire or fuel trim malfunction was detected.
- The scan tool and the HDS can read the DTC, freeze frame data, current data, and other engine control module (ECM) data.
- For specific operations, refer to the user's manual that came with a scan tool or HDS.
If the MIL did not come on
If the MIL did not come on but there is a driveablility problem, refer to the Symptom Troubleshooting. Symptom Related Diagnostic Procedures
If you can't duplicate the DTC
Some of the troubleshooting in this section requires you to reset the ECM and try to duplicate the DTC. If the problem is intermittent and you can't duplicate the code, do not continue through the procedure. To do so will only result in confusion and, possibly, a needlessly replaced ECM.
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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.