FixVault
Home › Isuzu › 1998 › Rodeo LS, 2.2 D › Repair and Diagnosis › Engine Performance › System › Engine Controls - Basic Testing › Trouble Shooting - Hombre 2.2L › DLC Diagnosis Or No Scan Tool Data

DLC Diagnosis Or No Scan Tool Data

  1. Perform On-Board Diagnostic II (OBD-II) System Check. See ON-BOARD DIAGNOSTIC (OBD-II) SYSTEM CHECK in TESTS W/CODES - INTRODUCTION article. After performing OBD-II system check, go to next step.
  2. 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 5).
  3. Using scan tool, attempt to communicate with other control modules. If scan tool communicates with other control modules, go to step 10). If scan tool does not communicate with other control modules, go to next step.
  4. 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 12). If scan tool does not communicate with other control modules, go to step 11).
  5. Using a test light connected to ground, probe DLC battery feed circuit (Orange wire). See WIRING DIAGRAMS article. If test light illuminates, go to next step. If test light does illuminate, go to step 7).
  6. Using a test light connected to battery voltage, probe DLC ground circuits (Black and Black/White wires). See WIRING DIAGRAMS article. If test light illuminates for both ground circuits, go to step 8). If test light does not illuminate for both ground circuits, go to step 9).
  7. Repair open or short to ground in DLC battery feed circuit (Orange wire). After repairs, go to step 15).
  8. Check DLC for proper terminal tension or excessive resistance. Repair as necessary. After repairs, go to step 15). If terminals are okay, go to step 14).
  9. Repair open or poor connections in DLC ground circuits (Black and/or Black/White wires). After repairs, go to step 15).
  10. Check for open in class 2 serial data circuit (Yellow wire) between PCM and splice connection. Repair as necessary. After repairs, go to step 15). If circuit is okay, go to step 12).
  11. Check for open or short in class 2 serial data circuit (Purple wire) between PCM and DLC. Repair as necessary. After repairs are complete, go to step 15). If circuit is okay, go to step 13).
  12. Replace PCM. Program PCM. After repairs, go to step 15).
  13. 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.
  14. Scan tool is malfunctioning. Using scan tool operation manual, repair as necessary. After repairs, go to next step.
  15. 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).
  16. Check if any additional DTC(s) are set. If additional DTC(s) are present, diagnose DTC(s). See TESTS W/CODES - INTRODUCTION article. If no DTC(s) are stored, system is okay.
About FixVault