DIAGNOSIS SYSTEM 1. DESCRIPTION The 4 wheel drive control ECU records DTCs when the ECU detects a malfunction in the ECU itself or in system circuits. The DTCs can be read through the DLC3 of the vehicle. When the system seems to be malfunctioning, use the Techstream to check for malfunctions and perform troubleshooting. 2. CHECK DLC3 (a) Inspect the battery voltage. Standard voltage: 11 to 14 V If the voltage is below 11 V, recharge the battery before proceeding. (b) Check the DLC3 (See page 3. FUNCTION OF INDICATOR LIGHT (a) When a problem occurs in the touch select 2-4 and high-low system, the 4HI and 4LO indicator lights on the combination meter assembly rapidly blink* to inform the driver of the problem.
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Toyota Tundra Service Manual > Power Tilt And Power Telescopic Steering Column System: Precaution
PRECAUTION HANDLING PRECAUTIONS (a) When handling the electronic parts: (1) Avoid any impact to electronic parts such as ECUs and relays. Replace these parts with new ones if dropped or subjected to a severe blow. (2) Do not expose any electronic parts to high temperatures or humidity. (3) Do not to ...
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