Toyota Tacoma manuals

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 ).

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.

  • *: 0.25 second intervals (0.25 seconds on and 0.25 seconds off)

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

(1) for 4WD

DIFFERENTIAL SYSTEM (w/ Differential Lock)

DTC No.

Rear Differential Lock Indicator Light

4WD Indicator Light (Green)

4LO Indicator Light

Multi-information Display Message

U0122

Rear differential locked: Illuminated

Rear differential free: Not illuminated

Not illuminated

Rapidly blinking

2WD-4WD mode change malfunction visit your dealer

U0416

P163B

Not illuminated

Status displayed*

P17BB

Rapidly blinking

Not illuminated

Not illuminated

-

P17BC

P17C0

Rapidly blinking

Status displayed*

Status displayed*

-

P17C1

P17CC

Rapidly blinking

Not illuminated

Not illuminated

-

  • *: Displays the 2WD/4WD mode status during a malfunction
  • Rapidly blinking: Blinks at 0.25 second intervals (0.25 seconds on and 0.25 seconds off)

(2) for 2WD:

DIFFERENTIAL SYSTEM (w/ Differential Lock)

DTC No.

Rear Differential Lock Indicator Light

U0122

Rapidly blinking

U0416

P163B

P17BB

P17BC

P17C0

P17C1

P17CC

  • Rapidly blinking: Blinks at 0.25 second intervals (0.25 seconds on and 0.25 seconds off)

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)

System Description
SYSTEM DESCRIPTION 1. DESCRIPTION The differential system (w/ Differential Lock) directly connects the rear left and right wheels so that even if one wheel slips while driving where d ...

Terminals Of Ecu
TERMINALS OF ECU 1. CHECK 4 WHEEL DRIVE CONTROL ECU Text in Illustration *a Component with harness connected (4 Wheel Drive Control ECU) - - ...

Other materials:

Inspection
INSPECTION PROCEDURE 1. INSPECT AIR CONDITIONING CONTROL ASSEMBLY (a) Check the blower switch resistance. (1) Measure the resistance according to the value(s) in the table below. Text in Illustration *a Component without harness connected ...

Unable to Unlock Steering Wheel (Engine cannot Start)
DESCRIPTION The steering lock actuator assembly activates the steering lock motor and moves the lock bar into the steering column to lock the steering. The steering may not unlock when the lock bar gets stuck in the lock hole of the steering column. In this case, if the engine switch is turned ...

Diagnostic Trouble Code Chart
DIAGNOSTIC TROUBLE CODE CHART Smart Key System DTC Code Detection Item See page B27A1 Open in Driver Side Electrical Antenna Circuit B27A5 Open in Front Floor Electrical Key Oscillator Circuit ...

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