Powertrain Diagnostic System Check
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 PCM is operating and can recognize a fault.
- If any DTCs are stored.
After performing procedures in PRELIMINARY INSPECTION & ADJUSTMENTS, BASIC FUEL SYSTEM CHECKS and BASIC IGNITION SYSTEM CHECKS in appropriate BASIC DIAGNOSTIC PROCEDURES article, this is the starting point for utilizing the self-diagnostic system for determining computer-related problems. After performing necessary tests as described in the powertrain diagnostic system check, if no DTCs are indicated and driveability problems still exist, see appropriate TROUBLE SHOOTING - NO CODES article and SCAN TOOL USAGE .
- Connect scan tool to 16-pin DLC located under left side of instrument panel. See Fig 1. If scan tool does not power up, see SCAN TOOL DOES NOT POWER UP in appropriate BODY CONTROL MODULES article. If scan tool powers up, go to next step.
- Attempt to establish communications, read and record DTCs from BCM, SDM, PCM 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.
- If any DTCs are set in BCM, see appropriate test under DIAGNOSTIC TESTS in appropriate BODY CONTROL MODULES article. If no DTCs are set in BCM, go to next step.
- If any DTCs are set in SDM, see appropriate test under DIAGNOSTIC TESTS in appropriate BODY CONTROL MODULES article. If no DTCs are set in SDM, go to next step.
- If DTCs are set in PCM, see DIAGNOSTIC TROUBLE CODE INDEX under DIAGNOSTIC TROUBLE CODE DEFINITION. If no DTCs are set in PCM, 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.
- If DTCs are present in EBTCM, see DIAGNOSTIC TESTS in appropriate ANTI-LOCK/TCS article. 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 symptom in appropriate TROUBLE SHOOTING - NO CODES article. If engine does not start and run, see appropriate BASIC DIAGNOSTIC PROCEDURES article.