Toyota Tacoma manuals

Toyota Tacoma 2015-2018 Service Manual: Diagnosis System

DIAGNOSIS SYSTEM

1. DESCRIPTION

(a) To check DTCs, connect the Techstream to the Data Link Connector 3 (DLC3) of the vehicle. The Techstream displays DTCs and freeze frame data. The DTCs and freeze frame data can be cleared with the Techstream (See page 2. NORMAL MODE AND CHECK MODE ).

2. NORMAL MODE AND CHECK MODE

(a) The diagnosis system operates in "normal mode" during normal vehicle use. In normal mode, "2 trip detection logic" is used to ensure accurate detection of malfunctions. "Check mode" is also available to technicians as an option. In check mode, "1 trip detection logic" is used for simulating malfunction symptoms and increasing the system's ability to detect malfunctions, including intermittent malfunctions.

3. 2 TRIP DETECTION LOGIC

(a) When a malfunction is first detected, the malfunction is stored as a pending DTC in the ECM memory (1st trip). If the same malfunction is detected during the next drive cycle, the DTC is stored (2nd trip).

4. FREEZE FRAME DATA

(a) The Techstream records freeze frame data in 5 different instances: 1) 3 times before the DTC is stored, 2) once when the DTC is stored, and 3) once after the DTC is stored. These sets of data can be used to simulate the vehicle condition around the time when the malfunction occurred. The data may help in finding the cause of the malfunction, or in judging if the DTC was caused by a temporary malfunction.

5. CHECK DATA LINK CONNECTOR 3 (DLC3)

5. CHECK DATA LINK CONNECTOR 3 (DLC3)

(a) Check the DLC3 (See page Terminals Of Ecm ).

Problem Symptoms Table
PROBLEM SYMPTOMS TABLE 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 pro ...

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 ...

Other materials:

Turn Signal Switch Circuit
DESCRIPTION The combination meter assembly receives the turn signal switch information and controls the turn signal lights. WIRING DIAGRAM PROCEDURE 1. READ VALUE USING TECHSTREAM (TURN SIGNAL SWITCH) (a) Connect the Techstream to the DLC3. (b) Turn the igni ...

How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT HINT: Use these procedures to troubleshoot the rear view monitor system. PROCEDURE 1. VEHICLE BROUGHT TO WORKSHOP NEXT 2. CUSTOMER PROBLEM ANALYSIS ...

AV Signal Stoppage (Low Battery Voltage) (B158F)
DESCRIPTION This DTC is stored when a video or audio signal is interrupted due to battery voltage input to the radio and display receiver assembly dropping temporarily. DTC Code DTC Detection Condition Trouble Area B158F A video or aud ...

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