AT2–34 A340E (2JZ—GTE) AUTOMATIC TRANSMISSION – TROUBLESHOOTING DIAGNOSIS SYSTEM The automatic transmission has built–in self–diagnostic functions. If a malfunction occurs in the system, the ECM stores the diagnostic trouble code in memory and the O/D OFF (Overdrive OFF) indicator light blinks to inform the driver. The diagnostic trouble code stored in memory can be read out by the following procedure. O/D OFF 004340 O/D OFF INDICATOR LIGHT INSPECTION 1. Turn the ignition switch ON. 2. Check if the O/D OFF indicator light lights up when the O/D main switch is pushed out to OFF and goes off when the O/D main switch is pushed in to ON. HINT: If the O/D OFF indicator light does not light up or stay on all the time, carry out the check for "O/D OFF Indicator Light Circuit" on page AT2–108. OFF ON 004238 DIAGNOSTIC TROUBLE CODE CHECK 1. Turn the ignition switch ON, but do not start the engine. 2. Push in the O/D main switch to ON. HINT: Warning and diagnostic trouble codes can be read only when the O/D main switch is ON. If it is OFF, the O/D OFF indicator light up will light continuously and will not blink. 3. Using SST, connect terminals TE1 and E1 of the DLC 1 or DLC2. SST 09843–18020 DLC2 DLC2 E1 DLC1 E1 TE1 TE1 004239 S-17-1 In-23-1-A 200025 0.25 sec. ON OFF 0.25 sec. AT0T15 4. Read the diagnostic trouble code indicated by the number of times the O/D OFF indicator light blinks (See next page). HINT: If the system is operating normally, the light will blink 2 times per second.