Toyota Tacoma manuals

Toyota Tacoma 2015-2018 Service Manual: Problem Symptoms Table

PROBLEM SYMPTOMS TABLE

HINT:

  • Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.
  • Inspect the fuses and relays related to this system before inspecting the suspected areas below.
Touch Select 2-4 and High-low System

Symptom

Suspected Area

See page

While in 2WD, even when the transfer position switch is turned to a position other than 2WD, the 4WD indicator light (green) and 4LO indicator light do not illuminate

ECU power source circuit

CAN communication system

Combination meter assembly

Transfer position switch

4 wheel drive control ECU

While in 4WD, even when the transfer position switch is turned to a position other than H4, the 4WD indicator light (green) remains on and the 4LO indicator light does not illuminate

ECU power source circuit

Clutch start switch circuit (for Manual Transmission)

Transfer position switch

4 wheel drive control ECU

While in 4WD, even when the transfer position switch is turned to a position other than L4, the 4WD indicator light (green) and 4LO indicator light remain illuminated

ECU power source circuit

Transfer position switch

4 wheel drive control ECU

CAN communication system

The 4WD indicator light (green) continues blinking after the transfer position switch is operated

ECU power source circuit

Transfer shift actuator assembly (transfer shift motor)

A.D.D. actuator (differential vacuum actuator assembly) (A.D.D. shift motor)

Transfer shift actuator assembly (limit switch, 4WD detection switch or L4 detection switch)

A.D.D. actuator (differential vacuum actuator assembly) (limit switch or A.D.D. position switch)

4 wheel drive control ECU

The 4LO indicator light continues blinking after the transfer position switch is operated

ECU power source circuit

Clutch start switch circuit (for Manual Transmission)

Transfer shift actuator assembly (transfer shift motor)

Transfer shift actuator assembly (limit switch, 4WD detection switch or L4 detection switch)

4 wheel drive control ECU

Blinking: Blinks at 0.5 second intervals (0.5 seconds on and 0.5 seconds off)

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) ...

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:

Ignition Switch
Components COMPONENTS ILLUSTRATION Removal REMOVAL PROCEDURE 1. REMOVE LOWER STEERING COLUMN COVER (a) Remove the 2 screws. (b) Disengage the 2 claws and remove the lower steering column cover. 2. REMOVE IGNITION OR STARTER SWITCH ASSEMBLY (a) Disconnect the connector. (b) Disen ...

Reassembly
REASSEMBLY PROCEDURE 1. INSTALL REAR AXLE HUB BOLT (a) Install a new deflector gasket and deflector onto the rear axle shaft. HINT: Align the 2 notches. (b) Install the 6 bolts through the axle hub. ...

Reassembly
REASSEMBLY CAUTION / NOTICE / HINT HINT: The procedure described below is for the LH side. Use the same procedure for both the LH and RH sides, unless otherwise specified. PROCEDURE 1. INSTALL REAR SEAT CUSHION FRAME SUB-ASSEMBLY (a) Install the rear seat cushion frame sub-assembl ...

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