OBDII (On-Board Diagnostics II) is a standardized system that allows you to access diagnostic information from your car’s computer. While widely adopted in modern vehicles, using Obdii On Older Cars, specifically those manufactured before 2007, can present unique challenges. This article explores these challenges and discusses solutions for integrating wideband data loggers, like the AEM 30-0300 and 30-0310, with OBDII scanners in pre-CAN vehicles.
Understanding the OBDII Challenge in Pre-CAN Vehicles
Most vehicles manufactured before 2007 utilized the J1850 protocol (VPW and PWM) for communication on the OBDII bus. This differs significantly from the CAN (Controller Area Network) protocol used in later models. The AEM 30-0334 wideband, designed for CAN-based systems, works seamlessly with tools like the HPTuners MPVI/MPVI2 scanners via a standard OBDII pass-thru cable. However, this direct connection isn’t possible for older vehicles lacking a CAN interface.
Bridging the Gap: J1850 to CAN Conversion
To utilize wideband data loggers like the AEM 30-0300 and 30-0310 in pre-2007 vehicles, an adapter is required to translate the J1850 signals into CAN. This adapter effectively replaces the standard OBDII pass-thru cable, allowing the wideband data to be interpreted by CAN-based scanners.
This adapter would feature screw terminals for connecting the CANH and CANL wires from the AEM 30-0300 or 30-0310 wideband(s), enabling multiple widebands to be connected and logged simultaneously.
Addressing Cold-Start Issues
A potential feature of this adapter is a cold-start safety function. This would delay the heating of the wideband sensor’s ceramic elements until after the engine starts, preventing thermal shock and potential damage. This function would provide added protection for the sensor, ensuring its longevity and reliable performance.
Cost Considerations and Potential Savings
While this adapter would represent an additional cost, estimated between $70 and $80 depending on demand, it offers significant savings compared to purchasing the newer AEM 30-0334 wideband. By utilizing the more affordable AEM 30-0300 or 30-0310 models in conjunction with the adapter, users can achieve comparable functionality at a lower overall cost.
Conclusion
Accessing wideband data on pre-2007 vehicles requires a specialized J1850 to CAN adapter. This solution allows tuners to leverage the capabilities of affordable wideband controllers like the AEM 30-0300 and 30-0310 with modern OBDII scanners. This adapter bridges the compatibility gap, providing a cost-effective solution for tuning older vehicles. The inclusion of a cold-start safety feature further enhances the value and functionality of this adapter.
