Toyota Tacoma manuals

Toyota Tacoma 2015-2018 Service Manual: Diagnosis System

DIAGNOSIS SYSTEM

1. DESCRIPTION

(a) The certification ECU (smart key ECU assembly) and ECM control the vehicle engine immobiliser system functions. Engine immobiliser system data and Diagnostic Trouble Codes (DTCs) can be read through the vehicle Data Link Connector 3 (DLC3).

In some cases, a malfunction may be occurring in the engine immobiliser system even though the security indicator light is not illuminated.

When the system seems to be malfunctioning, use the Techstream to check for malfunctions and perform repairs.

2. CHECK DLC3

(a) Check the DLC3 (See page 3. INSPECT BATTERY VOLTAGE ).

3. INSPECT BATTERY VOLTAGE

(a) Measure the battery voltage.

Standard Voltage:

11 to 14 V

If the voltage is below 11 V, recharge or replace the battery.

4. START FUNCTION PROBLEM SYMPTOMS

Symptom

Suspected Area

Component Malfunction

Possible Output DTCs

Related Data List Item

Engine cannot be started*1

Certification ECU (smart key ECU assembly)

Open or short circuit inside ECU

  • B278A
  • B2799
  • B279A
  • Ignition Switch
  • #Codes
  • Immobilizer when IG=ON
  • Immobiliser
  • Master Key
  • Sub Key
  • BCC Malfunction
  • Abnormal Status
  • Different Encrypt Code
  • Different Serial Number
  • Frame Error
  • Response
  • Wireless Starter Com ID
  • Wireless C Code
  • Engine Start Condition
  • ID-BOX Sleep Condition
  • ID-BOX Start Condition
  • Engine Start Request
  • 3bit Code Request
  • L Code Check
  • Unlock Request Receive
  • Lock Request Receive
  • L Code Check (Past)
  • EFI Code Receive
  • EFI communication

ECM

Open or short circuit inside ECU

  • B2799
  • B279A
  • B279C

EFI Code Receive

SFI system

ECM incompatible with installed engine immobiliser system

B279C

  • Engine Start Condition
  • EFI Code Receive

Power source mode cannot be changed*1

Engine switch

Open or short circuit inside switch

B278A

  • Ignition Switch
  • Unlock Request Receive
  • Lock Request Receive

Certification ECU (smart key ECU assembly)

Open or short circuit inside ECU

  • B2271
  • B2274
  • Ignition Switch
  • Immobilizer when IG=ON
  • Immobiliser

Steering lock lock/unlock not possible*2

Steering lock ECU (steering lock actuator or upper bracket)

  • Open or short circuit inside ECU
  • Actuator stuck
  • B2781
  • B2782
  • B2788
  • Unlock Request Receive
  • Lock Request Receive
  • *1: Refer to Problem Symptoms Table for Smart Key System (for Start Function).
  • *2: Refer to Problem Symptoms Table for Steering Lock System.
Registration
REGISTRATION PROCEDURE 1. DESCRIPTION OF CODE REGISTRATION HINT: Registering an ID code enables the entry and start function, wireless door lock control function and engine immobiliser ...

Dtc Check / Clear
DTC CHECK / CLEAR HINT: When using the Techstream with the engine switch off to troubleshoot: Connect the Techstream to the DLC3 and turn a courtesy light switch on and off at 1.5 se ...

Other materials:

On-vehicle Inspection
ON-VEHICLE INSPECTION PROCEDURE 1. INSPECT LOWER NO. 2 INSTRUMENT PANEL AIRBAG ASSEMBLY (for Vehicle not Involved in Collision) (a) Perform a diagnostic system check (See page ). (b) With the lower No. 2 instrument panel airbag assembly ...

Wireless remote control battery
Replace the battery with a new one if it is discharged. ■ You will need the following items: Lithium battery CR2032 ■ Replacing the battery Remove the cover using a coin protected with tape etc. Remove the discharged transmitter battery. Insert a new battery with the “+” te ...

USB port/AUX port
Connect an iPod, USB memory device or portable audio player to the USB port/AUX port as indicated below. Select “iPod”, “USB” or “AUX” on the “Select Audio Source” screen and the device can be operated via multimedia system. Connecting using the USB port/AUX port ■ iPod ...

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