Check Mode Procedure

A750E AUTOMATIC TRANSMISSION: AUTOMATIC TRANSMISSION SYSTEM: CHECK MODE PROCEDURE

1. DESCRIPTION

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) Ensure the following conditions:

(1) Battery positive voltage 11 V or more

(2) Throttle valve fully closed

(3) Transmission in the P or N position

(4) A/C switched off

(b) Turn the ignition switch to OFF.

(c) Connect a Techstream to the DLC3.

(d) Turn the ignition switch to ON.

(e) Turn the Techstream on.

(f) Enter the following menus: Powertrain / Engine and ECT / Utility / Check Mode.

(g) Change the ECM to check mode. Make sure the MIL flashes as shown in the illustration.





NOTICE:
All recorded DTCs and freeze frame data will be erased if: 1) the 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 LOCK.

Before entering check mode, make notes of the DTCs and freeze frame data.

(h) Start the engine. The MIL should turn off after the engine starts.

(i) 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).

(j) After simulating the malfunction conditions, use the Techstream diagnosis selector to check the DTC and freeze frame data.