Check Mode Procedure

CHECK MODE PROCEDURE
1. DESCRIPTION
(a) Check mode has a higher sensitivity to malfunctions and can detect malfunctions that normal mode cannot detect. Check mode can also detect all the malfunctions that normal mode can detect. In check mode, DTCs are detected with 1 trip detection logic.

2. CHECK MODE PROCEDURE
(a) Make sure that the following conditions are met:
(1) Battery positive voltage 11 V or more.
(2) Throttle valve fully closed.
(3) Shift lever P or N position.
(4) A/C off.
(b) Connect the intelligent tester or Techstream to the DLC3.
(c) Turn the ignition switch ON and push the tester switch ON.
(d) Enter the following menus:
(1) Intelligent tester - Select: DIAGNOSIS / OBD/MOBD / ECT / CHECK MODE /
(2) Techstream - Select: Powertrain / Engine and ECT / Check Mode /





(e) Check that the MIL flashes as shown in the illustration.

NOTICE:
^ All DTCs and freeze frame data will be erased if: 1) the intelligent tester or Techstream is used to change the ECM from normal mode to check mode or vice versa; or 2) during check mode, the ignition switch is turned from ON to ACC or OFF.
^ Before changing to check mode, make notes of the DTCs and freeze frame data.

(f) Start the engine. The MIL should turn off after the engine starts.
(g) Perform "MONITOR DRIVE PATTERN" for the ECT test. Monitors, Trips, Drive Cycles and Readiness Codes
(Or, simulate the conditions of the malfunction described by the customer.)
(h) After simulating the malfunction conditions, use the tester to check the DTC and freeze frame data.