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 > Engine: On-vehicle Inspection
ON-VEHICLE INSPECTION PROCEDURE 1. INSPECT IGNITION TIMING (a) Warm up and stop the engine. (1) Allow the engine to warm up to a normal operating temperature. (b) When using the Techstream: (1) Connect the Techstream to the DLC3. (2) Start the engine and idle it. (3) Turn the Techstream main switch ...
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