Connecting a car scanner to a 1997 vehicle can sometimes be tricky due to variations in OBD-II protocols. This article addresses the challenges of reading codes on a 1997 Honda Prelude experiencing RPM loss. We’ll explore potential solutions and discuss specific scanner recommendations.
Understanding OBD-II in 1997 Vehicles
While OBD-II became mandatory in the US for 1996 model year vehicles, international standards and implementation varied. Japanese Domestic Market (JDM) cars, like the Honda Prelude, often used the JOBD protocol, which can present compatibility issues with standard OBD-II scanners. European models utilized EOBD, further adding to the complexity. Identifying the correct protocol for your specific 1997 Honda Prelude is crucial for successful code reading. The Prelude uses the ISO 9141 protocol for communication.
Troubleshooting a 1997 Honda Prelude with a Scanner
The owner of a 1997 Honda Prelude reports RPM loss and difficulty reading codes using professional-grade scanners on both the 16-pin OBD-II connector and the 3-pin service connector. Even attempting to retrieve codes via the Check Engine Light (CEL) blinking method proved unsuccessful. This suggests potential issues beyond standard OBD-II communication problems.
One possible explanation is a modified or chipped Engine Control Unit (ECU). Aftermarket modifications to the ECU can sometimes interfere with standard diagnostic procedures. Physically inspecting the ECU for signs of tampering is recommended.
Scanner Recommendations for a 1997 Honda Prelude
While an ANCEL JP700, designed for JOBD compatibility, was initially suggested, the owner opted for an OSCBD OS601 scan tool. This model claims compatibility with OBD-II using the ISO 9141 protocol required for this specific Honda. The OS601 utilizes a three or four-wire connection, potentially bypassing the standard 16-pin connector. Whether the OSCBD OS601 successfully communicates with the 1997 Prelude’s ECU remains to be seen.
Conclusion: Further Steps
The success of reading codes on this 1997 Honda Prelude hinges on the chosen scanner’s compatibility with the ISO 9141 protocol and the potential presence of ECU modifications. Investigating the ECU for chips and testing the OSCBD OS601 scanner are the next logical steps. If neither yields results, seeking assistance from a Honda specialist familiar with older models is recommended. Successfully diagnosing the RPM loss requires accurate data from the vehicle’s computer, achievable with the right tools and expertise.
