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:

Freeze Frame Data
FREEZE FRAME DATA 1. FREEZE FRAME DATA (a) Whenever a meter DTC is detected, the combination meter assembly stores the current vehicle state as freeze frame data. 2. CHECK FREEZE FRAME DATA (a) Connect the Techstream to the DLC3. (b) Turn the ignition switch to ON. (c) Turn the Techstream on ...

Operation History List
OPERATION HISTORY LIST NOTICE: The cause of a malfunction is stored in the RAM or EEPROM in the certification ECU (smart key ECU assembly). As the cause of a malfunction stored in the RAM will be cleared when the cable is disconnected from the negative (-) battery terminal, do ...

Parts Location
PARTS LOCATION ILLUSTRATION *1 SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) *2 THROTTLE BODY WITH MOTOR ASSEMBLY *3 PARK/NEUTRAL POSITION SWITCH *4 VSC OFF SWITCH *5 MILLIMETER ...

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