CHECK Mode DTC Retrieval (Hand-Held Tester Only)

NOTE: If the hand-held tester switches the ECM from the normal mode to the check mode or vice-versa, or if the ignition switch is turned from ON to ACC or OFF during the check mode, the DTCs and freeze frame data will be erased.

Compared to the normal mode, the check mode has an increased sensitivity to detect malfunction. Furthermore, the same diagnostic items which are detected in the normal mode can also be detected in the check mode.

Ensure vehicle battery positive voltage is 11 V or more. Apply parking brake. Place transaxle in P or N. Ensure A/C and ignition are off. Check that throttle valve is fully closed.
Prepare the hand-held tester and connect it to the DLC3 at the lower center of the instrument panel. See Figure.
Turn ignition ON and then turn hand-held tester ON.
Switch hand-held tester from the normal mode to the check mode. Check that the malfunction indicator light (MIL) on instrument cluster flashes to indicate CHECK mode operation.
Start the engine. If no DTCs are present, MIL will turn off. Simulate the conditions of the malfunction described by customer.
NOTE: Leave the ignition switch ON until you have checked the DTC, etc. Turning the ignition switch OFF switches the diagnosis system from the check mode to the normal mode, so all DTCs, etc. are erased.
After simulating the malfunction conditions, use the hand-held tester diagnosis selector to check the DTC and freeze frame data, etc. 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. See DIAGNOSTIC TROUBLE CODE DEFINITIONS .
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.