Diagnostic Starting Point - SCR System Controls

Diagnostic Starting Point - SCR System Controls

Begin the system diagnosis with Diagnostic System Check - SCR System Controls. The Diagnostic System Check - SCR System Controls will provide the following information:
- The identification of the control modules which command the system.
- The ability of the control modules to communicate through the serial data circuit.
- The identification of any stored diagnostic trouble codes (DTCs) and their statuses.

The use of the Diagnostic System Check - SCR System Controls will identify the correct procedure for diagnosing the system and where the procedure is located.

Engine Control System Check Sheet (3.0L) in the engine controls must be used to verify the customer complaint, you need to know the correct (normal) operating behavior of the system and verify that the customer complaint is a valid failure of the system.