CHECK Mode Diagnostic Trouble Code Retrieval (Toyota Hand-Held Tester Only)

NOTE: If using Toyota hand-held tester, if ignition switch is turned from ON to ACC or OFF position during CHECK mode, all DTCs and freeze frame data will be erased from Engine Control Module (ECM). DO NOT switch from CHECK MODE to NORMAL mode until all DTCs and freeze frame data are recorded.

Ensure vehicle battery is fully charged. Apply parking brake. Place transmission in Park or Neutral. Ensure A/C and ignition are off. Check that throttle valve is fully closed. Connect hand-held tester to Data Link Connector (DLC) No. 3. See Figure. Turn ignition on and then turn hand-held tester on.
Switch hand-held tester from NORMAL mode to CHECK mode. Ensure Malfunction Indicator Light (MIL) on instrument cluster flashes to indicate CHECK mode operation. Start engine. If no DTCs are present, MIL will turn off. Try to simulate conditions of driveability complaint described by customer.
Record any DTCs and freeze frame data displayed for system diagnosis. If driveability problem exists and no DTCs are present, go to TROUBLE SHOOTING - NO CODES article for diagnosis by symptom.
If any DTCs exist, perform appropriate DTC test under DIAGNOSTIC TESTS . For DTC descriptions, see DIAGNOSTIC TROUBLE CODE DEFINITIONS table under DIAGNOSTIC TROUBLE CODE DEFINITIONS. For information on freeze frame data, see FREEZE FRAME DATA . For information on two-trip detection logic DTCs, see TWO-TRIP DETECTION LOGIC .
After repairs for DTC have been completed, DTC must be cleared from Engine Control Module (ECM). See CLEARING DIAGNOSTIC TROUBLE CODES . Road test vehicle to ensure all symptoms and/or complaints have been repaired.