NORMAL Mode Code Retrieval
NOTE:
- If there is no DTC in normal mode, check 1st trip DTC using continuous test results function (mode 7 for SAE J1979) on OBD II scan tool or hand-held tester.
- Hand-held tester only
When diagnosis system is switched from normal mode to check mode, all DTCs and freeze frame data recorded in normal mode will be erased. So before switching modes, always check DTCs and freeze frame data, and note them down.
- Prepare and connect OBD II scan tool (complying with SAE J1978) or hand-held tester to DLC3. See Figure. Turn ignition switch ON with engine off. Turn OBD II scan tool or hand-held tester switch ON.
- Use OBD II scan tool or hand-held tester to check DTCs and freeze frame data and write them down. For operating instructions, see instruction book. If hand-held tester or scan tool displays UNABLE TO CONNECT TO VEHICLE, see DATA LINK CONNECTOR NO. 3 INSPECTION under SCAN TOOL PROBLEMS.
- Record any DTCs and freeze frame data displayed for system diagnosis. If any DTCs are present, perform appropriate DTC test under DIAGNOSTIC TESTS . If driveability problem exists and no DTCs are present, go to TROUBLE SHOOTING - NO CODES
article for diagnosis by symptom. For more information on freeze frame data, see FREEZE FRAME DATA . For information on two-trip detection logic codes, see TWO-TRIP DETECTION LOGIC .NOTE:
When simulating symptom with an OBD II scan tool (excluding hand-held tester) to check DTCs, use normal mode. For code on DTC chart subject to 2 trip detection logic, perform either of following actions:
- Turning ignition switch OFF after symptom is simulated once. Then repeat simulation process again. When problem has been simulated twice, MIL lights up and DTCs are recorded ECM.
- Check 1st trip DTC using mode 7 (continuous test results) for SAE J1979.
- After repairs for DTC have been completed, DTC must be cleared from ECM. See CLEARING DIAGNOSTIC TROUBLE CODES . Road test vehicle to ensure all symptoms and/or complaints have been repaired.