Toyota Tacoma 2015-2018 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 differential system (w/ Differential Lock), the rear differential lock indicator light on the combination meter assembly rapidly blinks* to inform the driver of the problem.

(b) Indicator light (illuminated or blinking) or multi-information display status when DTC is output.

(1) for 4WD

(2) for 2WD:

4. CHECK INDICATOR LIGHT

(a) for 4WD:

With the ignition switch turned to ON and the transfer in 2WD, press the differential lock switch and check that the rear differential lock indicator light blinks* 3 times.

*: 0.5 second intervals (0.5 seconds on and 0.5 seconds off)

for 2WD:

With the ignition switch turned to ON, press the differential lock switch and check that the rear differential lock indicator light blinks* 3 times.

*: 0.5 second intervals (0.5 seconds on and 0.5 seconds off)