It may be a problem with the scan tool you are using, and not necessarily with the vehicle. Before getting too heavily involved in assuming there is a problem with the vehicle, try another scan tool, or even a code reader. Pin 9, the tan wire at the data link connector, is the scan tool communication line for the PCM, EBCM, SDM, and the IPC for UART communications. Pin 2, purple wire, is class 2 to PCM only. Do you have a scanner that can access other modules, and does it communicate with them?
Thursday, August 25th, 2011 AT 4:46 AM