Toyota Tacoma (2015-2018) Service Manual: Diagnosis System
DIAGNOSIS SYSTEM
1. DESCRIPTION
The ECU stores trouble codes when malfunctions occur.
The diagnostic system allows for reading of the trouble codes from the DLC3.
Use the Techstream to help diagnose and repair the problem.
2. CHECK DLC3
(a) Check the DLC3 (See page .gif)
).
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. SELF-DIAGNOSTIC MODE
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / Smart Key / Utility / Wireless Door Lock Diagnosis Mode.
(e) Proceed to the next step in accordance with the prompts on the Techstream screen.
HINT:
The electrical key transmitter uses 2 different frequencies alternately for communication. When in self diagnostic mode, one of the channels can be selected or the channels can be automatically switched.
(f) Check that the system has switched to self-diagnostic mode by checking the wireless door lock buzzer output pattern.
(g) Check the diagnostic outputs when the electrical key transmitter sub-assembly switch is held down.
The diagnostic outputs can be checked by the interior light and wireless door lock buzzer patterns.
Result
|
Wireless Door Lock Buzzer Output |
Suspected Area |
|---|---|
|
A |
Normal (No malfunction) |
|
B |
Register wireless code |
|
C |
Wave interference or malfunction of a related component |
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 lis ...
Dtc Check / Clear
DTC CHECK / CLEAR
1. CHECK FOR DTC
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 ...
Other materials:
Main Switch Illumination Circuit
DESCRIPTION
When the light control switch is turned to the tail or head position, this circuit
sends an illumination signal to the wireless charger main switch (mobile wireless
charger switch). Based on this signal, the wireless charger main switch (mobile
wireless charger switch) is illumina ...
Brake System Malfunction (C1A50)
DESCRIPTION
When the pre-collision system is operating, the millimeter wave radar sensor
assembly sends brake control signals to the skid control ECU (master cylinder solenoid)*1
or skid control ECU (brake actuator assembly)*2.
If the millimeter wave radar sensor assembly receives a vehicle st ...
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 ...
