Toyota Tacoma (2015-2018) Service Manual: Diagnosis System
DIAGNOSIS SYSTEM
1. DESCRIPTION
(a) Air conditioning system data and the Diagnostic Trouble Codes (DTCs) can be read through the Data Link Connector 3 (DLC3) of the vehicle. When the system seems to be malfunctioning, use the Techstream to check for malfunctions and perform troubleshooting.
2. CHECK DLC3
(a) Check the DLC3 (See page .gif)
).
3. LIST OF OPERATION METHODS
(a) By operating each of the air conditioning control switches as shown in the diagram below, it is possible to enter diagnostic check mode.
4. INDICATOR CHECK
(a) Turn the ignition switch off.
(b) Turn the ignition switch to ON while pressing the air conditioning panel "AUTO" switch and "Recirculation/Fresh" switch simultaneously. Hold both switches until the indicator check screen appears.
Text in Illustration
|
*a |
Example |
(c) The indicator check is automatically performed when panel diagnosis is activated. Check that the indicators light up and go off 4 times at 1 second intervals continuously.
Text in Illustration
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*a |
Example |
*b |
State of indicator check |
|
*c |
On |
*d |
Off |
|
*e |
1 second |
- |
- |
HINT:
- The sensor check automatically starts when the indicator check is completed.
- Press the "OFF" switch to cancel check mode.
5. SENSOR CHECK (DTC CHECK)
(a) Start the engine and warm it up.
(b) Perform the indicator check.
HINT:
After the indicator check is completed, the system enters DTC check mode automatically.
(c) Read the DTCs displayed on the display.
Text in Illustration
|
*a |
Example |
|
*b |
DTC |
NOTICE:
In sensor check mode, which is automatically entered after indicator check mode, troubleshooting may be partially performed. Be sure to perform the sensor check again.
HINT:
Refer to Diagnostic Trouble Code Chart for details of the codes (See page
).
- When there are no problems, DTC 00 is output.
- As an example, the illustration shows that DTC 12 is output.
(d) If the steps are difficult to read because they change automatically, press the "driver side TEMP UP" switch to display the steps one at a time so that they can be read easily. The items are displayed step by step each time the "driver side TEMP UP" switch is pressed.
HINT:
Press the "OFF" switch to finish panel diagnosis.
6. SENSOR CHECK (CLEAR DTC)
(a) During the sensor check, press the "Mirror Heater" switch and "Rear DEF" switch simultaneously.
Text in Illustration
|
*a |
Example |
System Description
SYSTEM DESCRIPTION
1. GENERAL
(a) The air conditioning system has the following controls.
Control
Outline
Neural Network Control
This control is ca ...
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 ...
Other materials:
PTC Heater Circuit
DESCRIPTION
PTC HTR heater relays are closed in accordance with signals from the air conditioning
amplifier assembly and power is supplied to the quick heater assembly installed
on the radiator heater unit.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Inspect the fuses for circuits rela ...
Engine does not Start
DESCRIPTION
When the key is in the vehicle and the engine switch is pressed, the certification
ECU (smart key ECU assembly) receives a signal and changes the power source mode.
In addition, when the shift lever is in P or N and the brake pedal is depressed,
the engine can be started by pressi ...
Noise Occurs or Sound Skips when Portable Player Plays
CAUTION / NOTICE / HINT
HINT:
Perform this check with the portable player volume set at an appropriate
level.
Make sure that there are no obstructions between the portable player
and radio and display receiver assembly that may block signals, and that
the portable player an ...
