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DLC Diagnosis Or No Scan Tool Data

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. Turn ignition on with engine off. MIL should illuminate. If MIL does not illuminate, go to MALFUNCTION INDICATOR LIGHT (MIL) INOPERATIVE . If MIL illuminates, go to next step.
  3. Turn ignition on with engine off. Install Tech 2 scan tool. If scan tool is equipped with external power source, ensure power source and ground are okay. If scan tool powers up, go to next step. If scan tool does not power up, go to step  6.
  4. Using scan tool, attempt to communicate with other control modules. If scan tool communicates with other control modules, go to step  11. If scan tool does not communicate with other control modules, go to next step.
  5. Turn ignition off. Disconnect PCM connectors. Turn ignition on. Using scan tool, attempt to communicate with other control modules. If scan tool communicates with other control modules, go to step  13. If scan tool does not communicate with other control modules, go to step  12.
  6. Using DVOM, measure voltage between ground and terminal No. 16 (Orange wire) on DLC connector. See SYSTEM WIRING DIAGRAMS article. If battery voltage is present, go to next step. If battery voltage is not present, go to step  8.
  7. Measure voltage between terminals No. 16 and, No. 4 and 5 (ground circuits) on DLC connector. See SYSTEM WIRING DIAGRAMS article. If battery voltage is present on both circuits, go to step  9. If battery voltage is not present on either circuit, go to step  10.
  8. Repair open or short to ground in DLC battery feed circuit (Orange wire) at terminal No. 16. After repairs, go to step  16.
  9. Check DLC for proper terminal tension or excessive resistance. Repair as necessary. After repairs, go to step  16. If terminals are okay, go to step  15.
  10. Repair open or poor connections in DLC ground circuits (Black and/or Black/White wires) at terminals No. 4 and 5. After repairs, go to step  16.
  11. Check for open in class 2 serial data circuit (Dark Green wire) between terminal No. 59 on PCM C1 harness connector and terminal B on splice pack harness connector. Splice pack harness connector is part of body harness, located on left side of instrument panel, below fuse block, taped to body harness. Repair as necessary. After repairs, go to step  16. If circuit is okay, go to step  13.
  12. Check for open or short in class 2 serial data circuit between terminal No. 59 on PCM C1 harness connector and terminal No. 2 on DLC. Repair as necessary. After repairs are complete, go to step  16. If circuit is okay, go to step  14.
  13. Replace PCM. Program PCM. See PROGRAMMING . After repairs, go to step  16.
  14. Install scan tool on another vehicle equipped with class 2 serial data and check for proper operation. If scan tool operates properly, diagnose vehicle computer system. If scan tool does not operate properly, go to next step.
  15. Scan tool is malfunctioning. Using scan tool operation manual, repair as necessary. After repairs, go to next step.
  16. Using scan tool, clear DTC(s). Warm engine to operating temperature. Operate vehicle within conditions required to set DTC. If scan tool indicates diagnostic ran and passed, go to next step. If scan tool does not indicate diagnostic ran and passed, go to step  2.
  17. Check if any additional DTC(s) are set. If additional DTC(s) are present, diagnose DTC(s). See SELF-DIAGNOSTICS - INTRODUCTION article. If no DTC(s) are stored, system is okay.
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