Couple things I pulled off Identifix,
Tests/Procedures: 1. Turn the key on, engine off. Check for battery voltage at the "Trans" fuse.
2. Check for B+ into the transmission on the Pink/Black wire.
3. If the voltage drops lower than battery voltage, check at C100 for a bad connection at pin a3.
4. If voltage is present at connector C100, replace the Pink/Black wire to the transmission from C100.
Tests/Procedures: 1. Locate the Pink wire pin "E" at the transmission pass-through connector. (NOTE: there are multiple Pink wires in the connector).
2. Turn the key on, engine off. Using a headlight and suitable jumpers, load the Pink wire at Pin "E". Verify good voltage is present to the pin.
3. If voltage is low or insufficient, locate terminal A2 of C100. The connector will be to the driver's side of the Master Cylinder assembly, where the harness goes through the firewall. With the circuit still loaded at the transmission connector, check for battery voltage at terminal A2.
4. If voltage is correct, repair open circuit or bad wire between C100 and the transmission pass-through connector
Customer Concern: Has trouble codes 66, 67, 81, 82 and 83. All transmission problems. Intermittently the transmission starts in 3rd gear. Problem has occurred 2 times in 11,000 miles. Intermittently the "PRNDL" display is dim.
Average Reported Mileage: 89000
Tests/Procedures: Clear the codes. Check the ignition switch by backprobing the "TRANS" fuse during the failure. If voltage drops below charging system voltage, and any of the codes reappear, the ignition switch will have failed. If intermittent, wiggle the ignition switch while monitoring the voltage.
