Toyota Tundra Service Manual: Diagnosis System

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.

  • *: 0.25 second intervals (0.25 seconds on and 0.25 seconds off)
    4WD Control Switch Circuit

    Diagnostic Trouble Code Chart

    See More:

    Toyota Tundra Owners Manual > Steps to take in an emergency: If the engine will not start
    If the engine will not start even though correct starting procedures are being followed, consider each of the following points. The engine will not start even though the starter motor operates normally. One of the following may be the cause of the problem: There may not be sufficient fuel in the ve ...

    Toyota Tundra Owners Manual

    Toyota Tundra Service Manual

    © 2023 Copyright www.ttundra.com
    0.0196