Code 28
- Disconnect speed sensor connector. See Fig 1 . Put system into "Sensor Test Mode 96". Read-out box display should be should be "02". If read-out box display reads "02", proceed to step 2). If display is not "02", replace the computer.
- Connect a jumper lead between the terminals of the speed sensor connector on the engine harness. See Fig 2 . Display should change from "02" to "01". If display changes from "02" to "01", proceed to step 3). If display does not change, proceed to step 4).
- Turn the ignition off. Remove speed sensor from transaxle. Connect ohmmeter between the speed sensor connector terminals. See Fig 3 . Slowly rotate speed sensor one turn. Ohmmeter should show 8 pulses for every turn of the speed sensor. If ohmmeter reading is okay, inspect transaxle drive gear and speed sensor drive gear for proper contact. If ohmmeter reading is not okay, replace speed sensor.
- Connect a jumper lead to the White/Orange wire of the speed sensor harness connector and ground. See Fig 4 . Read-out box display should change from "02" to "01". If display changes, repair the Black/Blue wire of the speed sensor harness connector for an open circuit. If display does not change, repair the White/Orange wire of the speed sensor connector for an open circuit.