Test O: Serial Data Link Test

NOTE: For more information on computer controls and wiring, see COMPUTERIZED ENGINE CONTROLS.

1. With the ignition switch in "RUN", connect a scan tool to the ALDL connector. Enter ECM diagnostics and confirm that ECM data can be read.

a. If ECM data cannot be read, refer to the section on COMPUTERIZED ENGINE CONTROLS.

Serial Data Link Test:

b. If ECM data can be read, use the table.