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 touch select 2-4 and high-low system, a message is displayed on the multi-information display and/or the 4LO 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 status (illumination and blinking) or multi-information display status when DTC is output.

TOUCH SELECT 2-4 AND HIGH-LOW SYSTEM

DTC No.

4WD Indicator Light (Green)

4LO Indicator Light

Multi-information Display Message

U0100

When 2WD: Not illuminated

When H4 or L4: Illuminated

Rapidly blinking

-

U0122

Not illuminated

Rapidly blinking*1

2WD-4WD mode change malfunction visit your dealer

U0416

P163B

P17A0

P17A4

Not illuminated

Not illuminated

2WD-4WD mode change malfunction visit your dealer

P17A8

Not illuminated

Rapidly blinking

2WD-4WD mode change malfunction visit your dealer

P17A9

P17AA

P17AC

P17C7

Not illuminated

When 2WD or H4: Not illuminated

When L4: Illuminated

2WD-4WD mode change malfunction visit your dealer

P17C8

P2772

When 2WD: Not illuminated

When H4 or L4: Illuminated

Rapidly blinking

-

P279E

Not illuminated

Rapidly blinking

2WD-4WD mode change malfunction visit your dealer

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

  • *1: P163B may also display the 2WD/4WD mode status.
System Diagram
SYSTEM DIAGRAM Transmitting ECU (Transmitter) Receiving ECU Signal Communication Method 4 wheel drive control ECU Skid ...

Dtc Check / Clear
DTC CHECK / CLEAR 1. CHECK DTC (a) Check the DTCs. (1) Turn the ignition switch off. (2) Connect the Techstream to the DLC3. (3) Turn the ignition switch to ON. (4) Turn the Techstream on. (5) ...

Other materials:

Open in Stop Light Switch Circuit (C1425)
DESCRIPTION The skid control ECU (brake actuator assembly) detects the brake operating conditions through a signal transmitted by the stop light switch. The skid control ECU incorporates a circuit to detect an open circuit. This DTC is output when an open circuit is detected in the stop light ...

Brake Switch "A" Signal Compare Failure (P057162)
DESCRIPTION When the brake pedal is depressed, the stop light switch assembly sends a signal to the ECM. When the ECM receives this signal, it cancels the dynamic radar cruise control. The fail-safe function operates to enable normal driving even if there is a malfunction in the stop light si ...

Communication Malfunction between ECUs Connected by LIN (B2785)
DESCRIPTION The certification ECU (smart key ECU assembly) monitors communication between all the ECUs connected to the certification bus lines. When the certification ECU (smart key ECU assembly) detects errors in communication with all the ECUs connected to the certification bus lines at a ...

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