Toyota Tacoma manuals

Toyota Tacoma 2015-2018 Service Manual: System Description

SYSTEM DESCRIPTION

1. ENGINE IMMOBILISER SYSTEM DESCRIPTION

The engine immobiliser system is designed to prevent the vehicle from being stolen. This system uses the transponder key ECU assembly that stores the key ID codes of authorized ignition keys. If an attempt is made to start the engine using an unauthorized key, the transponder key ECU assembly sends a signal to the ECM to prohibit fuel delivery and ignition, effectively disabling the engine.

2. FUNCTION OF MAIN COMPONENTS

Component

Outline

Transponder key ECU assembly

  • When a key is inserted into the ignition key cylinder, the transponder key ECU assembly checks if the key ID code received from the transponder key coil and registered key ID code match.
  • When the engine is started, the transponder key ECU assembly checks if the engine ID codes stored in the ECM and transponder key ECU assembly match.

Transponder key coil

When a key is inserted into the ignition key cylinder, the transponder key amplifier receives the key ID code from the transponder chip in the key grip and outputs it to the transponder key ECU assembly.

ECM

The ECM receives key ID code verification results from the transponder key ECU assembly. The ECM also verifies the ECUs. Then judgment of whether to immobilise the engine is made.

Unlock warning switch assembly

The unlock warning switch assembly detects if the key is in the ignition key cylinder and outputs the result to the transponder key ECU assembly.

Security indicator light (air conditioning control assembly)

Depending on the operation of the transponder key ECU assembly, the security indicator light comes on or starts blinking.

3. SYSTEM FUNCTION

(a) When the transponder key ECU assembly detects that the unlock warning switch assembly is on, the transponder key ECU assembly applies current to the transponder key coil and produces a magnetic field around the antenna coil. A transponder chip in the key grip outputs a key ID code signal using electromotive force generated by the magnetic field. The transponder key coil receives the signal and sends it to the transponder key ECU assembly. The transponder key ECU assembly checks if the key ID code received from the transponder key coil matches the registered key ID code.

When the engine is started, the ECM communicates with the transponder key ECU assembly and checks the key verification result. In addition, the ECM checks if the engine ID codes stored in the transponder key ECU assembly and ECM match. If they do not match, the ECM prohibits engine start.

(b) The security indicator light blinking pattern is as shown below (when changing from the immobiliser set status to the unset status):

System Diagram
Precaution
PRECAUTION 1. PRECAUTIONS WHEN USING TECHSTREAM (a) When using the Techstream to troubleshoot the engine immobiliser system: Connect the Techstream to the DLC3 while the ignition switch is off, and ...

System Diagram
SYSTEM DIAGRAM ...

Other materials:

Operation Check
OPERATION CHECK 1. CHECK POWER DOOR LOCK OPERATION NOTICE: The operation check below is based on the non-customized initial condition of the vehicle. (a) Check basic functions. (1) Check that all doors lock when the lock side of the door control switch is pressed. (2) Check that all doors ...

Installation
INSTALLATION PROCEDURE 1. INSTALL TRANSFER POSITION SWITCH (a) Attach the 2 claws to install the transfer position switch. 2. INSTALL AIR CONDITIONING CONTROL ASSEMBLY (for Automatic Air Conditioning System) (See page ) 3. INSTALL INTEGRATION PANEL SUB-ASSEMBLY (for Manual Cooler System) ...

Installation
INSTALLATION PROCEDURE 1. INSTALL FRONT AXLE HUB 2. INSTALL FRONT SUSPENSION UPPER ARM (a) Install a new nut and clip. Torque: 110 N·m {1122 kgf·cm, 81 ft·lbf} 3. INSTALL FRONT SUSPENSION LOWER ARM (a) Install the front suspension lower arm with the 2 bolts. Torque: 160 N·m {1631 ...

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