Diagnostic System Check - Engine Controls

WARNING: This page is about a different car, the 2003 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Tech 2 scan tool is required to perform powertrain diagnostic system check.

The powertrain diagnostic system check determines:

If Malfunction Indicator Light (MIL) operates.
If ECM is operating and can recognize a fault.
If any DTCs are stored.

Connect scan tool to 16-pin DLC located under left side of instrument panel. See Figure. If scan tool does not power up, see SCAN TOOL DOES NOT POWER UP in appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT. If scan tool powers up, go to next step.
Attempt to establish communications, read and record DTCs from BCM, SDM, ECM and ABS (if equipped) modules. If scan tool communicates with BCM, go to step 4. If scan tool does not communicate with BCM, go to next step.
If scan tool communicates with SDM, go to step 5. If scan tool does not communicate with SDM, see NO COMMUNICATION ON CLASS-2 DATA LINK in appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT.
If any DTCs are set in BCM, see DIAGNOSTIC TROUBLE CODE DEFINITIONS in appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT. If no DTCs are set in BCM, go to next step.
If any DTCs are set in SDM, see DIAGNOSTIC TROUBLE CODE DEFINITIONS in appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT. If no DTCs are set in SDM, go to next step.
If DTCs are set in ECM, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no DTCs are set in ECM, go to next step.
If scan tool communicates with EBTCM, go to next step. If scan tool does not communicate with EBTCM, see NO COMMUNICATION WITH EBTCM in appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT.
If DTCs are present in EBTCM, see DIAGNOSTIC TROUBLE CODE DEFINITIONS in appropriate ANTI-LOCK/TCS article in BRAKES. If no DTCs are present in EBTCM, go to next step.
If engine starts and runs, diagnostic system check is complete. If problem exists, observe scan tool data and/or refer to SYMPTOMS in TROUBLE SHOOTING - NO CODES - 2.2L & 3.0L VUE article. If engine does not start and run, see NO-START DIAGNOSIS in BASIC DIAGNOSTIC PROCEDURES - 2.2L & 3.0L VUE article.