Test Description
The number(s) below refer to the step number(s) on the diagnostic table.
-
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.
-
The symptom list in Symptoms will determine the correct diagnostic procedure to use.
-
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.
Step | Action | Yes | No | ||||||
|---|---|---|---|---|---|---|---|---|---|
1 | Install a scan tool. Does the scan tool power up? | Go to Step 2 | Go to Scan Tool Does Not Power Up in Data Link Communications | ||||||
Attempt to establish communication with the following modules:
Does the scan tool communicate with the modules? | Go to Step 3 | Go to Scan Tool Does Not Communicate with Class 2 Device in Data Link Communications | |||||||
Select the display DTC function on the scan tool for the following modules:
Does the scan tool display any DTCs? | Go to Step 4 | Go to Symptoms | |||||||
Does the scan tool display any DTCs which begin with a "U"? | Go to Scan Tool Does Not Communicate with Class 2 Device in Data Link Communications | Go to Step 5 | |||||||
5 | Does the scan tool display DTC B1982 or B1983? | Go to Diagnostic Trouble Code (DTC) List/Type in Engine Electrical | Go to Step 6 | ||||||
6 | Does the scan tool display DTC B1652, B1656 or B1658? | Go to Diagnostic Trouble Code (DTC) List/Type in Body Control System | Go to Step 7 | ||||||
7 | Does the scan tool display DTC P0530, P0601, P0602, P0604, P0606, P0704, P1546 or any other codes that would inhibit A/C operation? | Go to Diagnostic Trouble Code (DTC) List/Type in Engine Controls-3.8L | Go to DTC Table |
