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Powertrain Control Module Diagnostic System Check

CAUTION: DO NOT perform this diagnostic system check unless a procedure directs you here. Search for applicable Technical Service Bulletins (TSB) before proceeding. Ensure battery is fully charged and battery cables are clean and tight.
  1. Connect scan tool to Data Link Connector (DLC). See Figure . DLC is located under left side of instrument panel. If scan tool powers up, go to next step. If scan tool does not power up, perform TEST B: SCAN TOOL DOES NOT POWER UP  under SYSTEM TESTS.
  2. Turn ignition switch to ON position. Using scan tool, attempt to communicate with Body Control Module (BCM), Electronic Brake Control Module (EBCM), Powertrain Control Module (PCM) and Vehicle Theft Deterrent (VTD) module. If scan tool communicates with BCM, EBCM, PCM and VTD module, go to next step. If scan tool does not communicate with BCM, EBCM, PCM and/or VTD module, perform TEST A: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE  under SYSTEM TESTS.
  3. Attempt to start and idle engine. If engine starts and idles, go to next step. If engine does not start and/or idle, see appropriate BASIC DIAGNOSTIC PROCEDURES article in ENGINE PERFORMANCE.
  4. Select DISPLAY DTCS function on scan tool for BCM, EBCM, PCM and VTD module. If scan tool displays any DTCs, go to next step. If scan tool does not display any DTCs, go to step  9 .
  5. Using scan tool, select CAPTURED INFO, in order to store the powertrain DTC information. Go to next step.
  6. If scan tool displays any DTCs which begin with a "U", perform TEST A: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE  under SYSTEM TESTS. If scan tool does not display any DTCs which begin with a "U", go to next step.
  7. If scan tool displays DTC P0601 or P0602, see SELF-DIAGNOSTICS - 3.1L & 3.4L "N" & "W" BODIES EXCEPT LUMINA article in ENGINE PERFORMANCE. If scan tool does not display DTC P0601 or P0602, go to next step.
  8. If scan tool displays DTC P0560 or P0620, see SELF-DIAGNOSTICS - 3.1L & 3.4L "N" & "W" BODIES EXCEPT LUMINA article in ENGINE PERFORMANCE. If scan tool does not display DTC P0560 or P0620, perform appropriate test. See DIAGNOSTIC TROUBLE CODE DEFINITIONS  .
  9. If customer concern is with automatic transmission, see appropriate ELECTRONIC CONTROLS article in AUTOMATIC TRANSMISSIONS. If customer concern is not with automatic transmission, go to next step.
  10. If customer concern is with Inspection/Maintenance (I/M) testing, see INSPECTION/MAINTENANCE PROCEDURES in SELF-DIAGNOSTICS - 3.1L & 3.4L "N" & "W" BODIES EXCEPT LUMINA article in ENGINE PERFORMANCE. If customer concern is not with Inspection/Maintenance (I/M) testing, go to next step.
  11. Repair by symptom. See appropriate TROUBLE SHOOTING - NO CODES article in ENGINE PERFORMANCE.
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