Toyota Tacoma manuals

Toyota Tacoma 2015-2018 Service Manual: Check Mode Procedure



Check mode has a higher sensitivity to malfunctions and can detect malfunctions that cannot be detected in normal mode. Check mode can also detect all of the malfunctions that can be detected in normal mode. In check mode, DTCs are stored with 1 trip detection logic.


  • All DTCs and freeze frame data will be cleared if: 1) the Techstream is used to change the ECM from normal mode to check mode or vice versa; or 2) during check mode, the ignition switch is turned from ON to ACC or off.
  • Before changing to check mode, make a note of the DTCs and freeze frame data.


(a) Make sure that the following conditions are met:

(1) Battery voltage is 11 V or higher.

(2) The throttle valve is fully closed.

(3) The shift lever is in neutral.

(4) The A/C switch is off.

(b) Connect the Techstream to the DLC3.

(c) Turn the ignition switch to ON.

(d) Turn the Techstream on.

(e) Enter the following menus: Powertrain / Transmission / Utility / Check Mode.

(f) Check that the MIL flashes as shown in the illustration.

(g) Start the engine. The MIL should turn off after the engine starts.

(g) Start the engine. The MIL should turn off after the engine starts.

(h) Simulate the conditions of the malfunction described by the customer.

(i) Using the Techstream, check for DTCs and freeze frame data.

Terminals Of Ecm
TERMINALS OF ECM HINT: The standard normal voltage between each pair of ECM terminals is shown in the table below. The appropriate conditions for checking each pair of terminals are also indic ...

Data List / Active Test
DATA LIST / ACTIVE TEST 1. DATA LIST NOTICE: In the table below, the values listed under "Normal Condition" are reference values. Do not depend solely on these reference values when dec ...

Other materials:

REASSEMBLY CAUTION / NOTICE / HINT HINT: Use the same procedure for both the LH and RH sides. The procedure described below is for the LH side. PROCEDURE 1. INSTALL FOG LIGHT BULB (a) Turn the fog light bulb in the direction indicated by the arrow in the illust ...

PRECAUTION 1. IGNITION SWITCH EXPRESSIONS (a) The type of ignition switch used on this model differs according to the specifications of the vehicle. The expressions listed in the table below are used in this section. Expression Ignition Switch (Position) Engine ...

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 check ...

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