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Diagnostic Procedures

WARNING: This page is about a different car, the 2000 Isuzu Hombre. However, it is still accessible from the selected car via links, so may be relevant.
  1. Perform On-Board Diagnostic II (OBD-II) system check. See ON-BOARD DIAGNOSTIC II (OBD-II) SYSTEM CHECK in SELF-DIAGNOSTICS - INTRODUCTION article. After performing OBD-II system check, go to next step.
  2. Install Tech 2 scan tool. Attempt to display data from PCM. If scan tool can display PCM data, go to next step. If scan tool cannot display PCM data, check Data Link Connector (DLC) and repair as necessary.
  3. Using scan tool, attempt to communicate with Body Control Module (BCM). If communication can be established, go to next step. If communication cannot be established, check electrical circuits. See SYSTEM WIRING DIAGRAMS article.
  4. Check for intermittent short or open in BCM serial II data circuit (Yellow wire) between BCM and PCM. Repair as necessary. After repair, go to step  6. If circuit is okay, go to next step.
  5. Using scan tool, check for DTCs or communications problems with other modules. Repair or replace as necessary. After repairs, go to next step.
  6. Using scan tool, select CLEAR INFO or CLEAR DTCS function to clear DTCs. Start engine and allow it to idle. Ensure engine is at normal operating temperature. Operate vehicle within conditions required for setting this DTC. Select SPECIFIC DTC function, then enter DTC U1064. If scan tool indicates TEST RAN AND PASSED, go to next step. If scan tool does not indicate TEST RAN AND PASSED, repeat step  2.
  7. If any other DTCs are set, diagnose DTCs as necessary. If no other DTCs are set, system is okay. If intermittent problem is suspected, see DIAGNOSTIC AIDS . Repair as necessary.
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