Diagnostic System Check - Vehicle

DIAGNOSTIC SYSTEM CHECK

TEST DESCRIPTION

Steps 1 - 7:

Steps 8 - 12:

The numbers below refer to the step numbers on the diagnostic table.
1. This step ensures that the battery and the vehicle primary power and ground systems are functioning correctly.
3. Lack of communication may be due to a particular malfunction of a serial data circuit. The link to Scan Tool does not Communicate with Class 2 Device will provide a list of modules, and the associated data network, no communication diagnostic link.
4. A module that is operating in the incorrect power mode, based on key position, may cause other vehicle symptoms, and/or DTCs to set. The link to Power Mode Mismatch will correct the condition before checking for module DTCs or symptoms.
8. This step ensures that all data link communication DTCs are diagnosed before system level DTCs.
9. This step ensures that all electronic control unit (ECU) internal DTCs are diagnosed before other system level DTCs.
10. This step ensures that all device voltage DTCs are diagnosed before other system level DTCs.