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:

Initialization
INITIALIZATION NOTICE: Initialization can only be performed for vehicles with a tire pressure warning reset switch. If initialization is performed, the existing tire positions will be cleared, but will be automatically identified when the vehicle is driven at 37 km/h (23 mp ...

Data List / Active Test
DATA LIST / ACTIVE TEST 1. DATA LIST HINT: Using the Techstream to read the Data List allows the values or states of switches, sensors, actuators and other items to be read without removing any parts. This non-intrusive inspection can be very useful because intermittent conditions or signals ...

Sleep Operation Failure of Occupant Classification ECU (B1796)
DESCRIPTION During sleep mode, the occupant detection ECU monitors the condition of each sensor while the ignition switch is off. In this mode, if the occupant detection ECU detects an internal malfunction, DTC B1796 is set. DTC No. DTC Detections Conditions Tr ...

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