Diagnostic System Check

Diagnostic System Check - Automatic Transmission Shift Lock Control

Test 1-6:

Test 7-8:

Test Description
The numbers refer to the step numbers on the diagnostic table.
2. Lack of communication may be due to a partial malfunction of the class 2 serial data circuit or due to a total malfunction of the class 2 serial data circuit. The specified procedure will determine the particular condition.
4. Checks for Diagnostic Trouble Codes (DTC's) in the BCM and the PCM.
5. The presence of DTCs which begin with "U" indicate some other module is not communicating. The specified procedure will compile all the available information before tests are performed.