Toyota Tacoma (2015-2018) Service Manual: How To Proceed With Troubleshooting

HINT:

• Use these procedures to troubleshoot the smart key system (for Start Function).
• *: Use the Techstream.

HINT:

• In troubleshooting, confirm that the problem symptoms have been accurately identified. Preconceptions should be discarded in order to make an accurate judgment. To clearly understand what the problem symptoms are, it is extremely important to ask the customer about the problem and the conditions at the time the malfunction occurred.
• Gather as much information as possible for reference. Past problems that seem unrelated may also help in some cases.
• The following 5 items are important points for problem analysis:

  What	Vehicle model, system name
  When	Date, time, occurrence frequency, whether the problem occurred recently or has been occurring for a long time
  Where	Whether the problem occurs at a specific location
  Under what conditions?	Whether the doors were locked or unlocked, whether the engine switch was on, whether the engine has started
  How did it happen?	Problem symptoms*

  • *: Be sure to ask the customer in detail about the following points concerning the vehicle operating conditions, environment and problem, and then check for DTCs.
    1. If the entry lock/unlock function does not operate for all doors.
    2. If the entry lock function does not operate.
    3. If the entry unlock function does not operate.
    4. If both the entry lock and unlock functions do not operate.
    5. If the wireless lock and unlock functions do not operate.
    6. If there is no power even when the engine switch is pressed (does not turn on (ACC)).
    7. If the engine does not start with the push-button start function.
    8. If the wireless answer-back buzzer and outside warning buzzers do not sound.
    9. If the customer attempted to start the engine by touching the electrical key to the engine switch and pressing the engine switch.
    10. If the interior warning buzzers do not sound.
    11. If the steering does not unlock.
    12. Any other details concerning the problem.
  • If it is thought that wave interference is likely, be sure to ask the customer in detail about the following points concerning the vehicle operating conditions, environment and problem.
    1. Specific locations where the system does not operate (such as near TV towers, large video displays, wireless garage door opener systems, wireless security cameras, home security systems, etc.).
    2. Specific times when the system does not operate:Whether or not symptoms occurred immediately after purchase or only recently.Whether or not the symptoms occurred even when the key was near the vehicle (electrical key antenna).
    3. If the system does not operate only when near specific vehicles (there may be an effect from electric waves from the wireless systems of other vehicles).
    4. If the system operates intermittently.
    5. If the key is bundled together with other items.
    6. If the key is carried together with other electronic devices, such as cell phones, personal computers, portable music players, other electrical keys, etc. (keep the key at least 0.1 m (0.33 ft.) away from such items).
    7. Where the key is being kept when not in use:

       Whether or not the key being placed within 1 m (3.28 ft.) of items such as TVs, DVD recorders, induction cookers, rice cookers, dishwashers, modems, cell phones, personal computers, microwave ovens, desk or floor lamps, cordless telephones, etc.

    8. If there are electronic devices that transmit electric waves placed in the vehicle.
    9. When the key battery was last replaced (when the battery is low):

       The key battery can be checked using the "Key Low Battery" item in the Data List.

       Click here

    10. If the customer installed any optional components (theft deterrent devices, wireless fog lights, etc.) to the vehicle.

System Diagram

SYSTEM DIAGRAM Component Outline Engine switch Transponder key amplifier Turns on the power and starts the eng ...

Operation Check

OPERATION CHECK 1. OPERATION DESCRIPTION (a) Push-button start function: (1) When the electrical key transmitter sub-assembly is in a detection area inside the vehicle and the brake pedal is depr ...

Other materials:

Vehicle Speed Signal Circuit between Radio Receiver and Combination Meter
DESCRIPTION for Navigation Function: The navigation receiver assembly receives a vehicle speed signal from the combination meter assembly and sends the signal to navigation receiver assembly. for Automatic Sound Levelizer (ASL): This circuit is necessary for the Aut ...

Rear Speed Sensor RH Output Malfunction (C1415,C1416)
DESCRIPTION Refer to DTCs C1403 and C1404 (See page ). DTC No. Detection Item DTC Detection Condition Trouble Area C1415 Rear Speed Sensor RH Output Malfunction Any of the following is detected: An op ...

Diagnosis System
DIAGNOSIS SYSTEM 1. DESCRIPTION (a) Sliding roof system data and Diagnostic Trouble Codes (DTCs) can be read through the vehicle Data Link Connector 3 (DLC3). When the system seems to be malfunctioning, use the Techstream to check for malfunctions and perform repairs. 2. CHECK DLC3 (a) Check ...