Toyota Tacoma (2015-2018) Service Manual: 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 checking the suspected areas in the order they are listed. Replace parts as necessary.
- Inspect the fuses and relays related to this system before inspecting the suspected areas below.
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Symptom |
Suspected Area |
See page |
|---|---|---|
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While in 2WD, even when the transfer position switch is turned to a position other than 2WD, the 4WD indicator light (green) and 4LO indicator light do not illuminate |
ECU power source circuit |
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CAN communication system |
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Combination meter assembly |
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Transfer position switch |
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4 wheel drive control ECU |
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While in 4WD, even when the transfer position switch is turned to a position other than H4, the 4WD indicator light (green) remains on and the 4LO indicator light does not illuminate |
ECU power source circuit |
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Clutch start switch circuit (for Manual Transmission) |
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Transfer position switch |
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4 wheel drive control ECU |
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While in 4WD, even when the transfer position switch is turned to a position other than L4, the 4WD indicator light (green) and 4LO indicator light remain illuminated |
ECU power source circuit |
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Transfer position switch |
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4 wheel drive control ECU |
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CAN communication system |
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The 4WD indicator light (green) continues blinking after the transfer position switch is operated |
ECU power source circuit |
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Transfer shift actuator assembly (transfer shift motor) |
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A.D.D. actuator (differential vacuum actuator assembly) (A.D.D. shift motor) |
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Transfer shift actuator assembly (limit switch, 4WD detection switch or L4 detection switch) |
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A.D.D. actuator (differential vacuum actuator assembly) (limit switch or A.D.D. position switch) |
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4 wheel drive control ECU |
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The 4LO indicator light continues blinking after the transfer position switch is operated |
ECU power source circuit |
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Clutch start switch circuit (for Manual Transmission) |
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Transfer shift actuator assembly (transfer shift motor) |
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Transfer shift actuator assembly (limit switch, 4WD detection switch or L4 detection switch) |
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4 wheel drive control ECU |
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Blinking: Blinks at 0.5 second intervals (0.5 seconds on and 0.5 seconds off)
Dtc Check / Clear
DTC CHECK / CLEAR
1. CHECK DTC
(a) Check the DTCs.
(1) Turn the ignition switch off.
(2) Connect the Techstream to the DLC3.
(3) Turn the ignition switch to ON.
(4) Turn the Techstream on.
(5) ...
Terminals Of Ecu
TERMINALS OF ECU
1. CHECK 4 WHEEL DRIVE CONTROL ECU
Text in Illustration
*a
Component with harness connected
(4 Wheel Drive Control ECU)
-
-
...
Other materials:
Front Passenger Side Seat Belt Warning Light Malfunction
DESCRIPTION
The occupant classification ECU detects the state of the front seat inner belt
assembly RH and load sensor when the front passenger side seat is occupied with
the ignition switch ON. If the front passenger side seat belt is not fastened, the
front passenger side seat belt warning ...
Open in Bus 5 Main Bus Line
DESCRIPTION
There may be an open circuit in one of the CAN main bus lines when the resistance
between terminals 15 (CA5H) and 16 (CA5L) of the central gateway ECU (network gateway
ECU) is 70 Ω or higher.
Detection Item
Trouble Area
Resistance between ter ...
Seat heaters
On
The indicator comes on.
Adjusts the seat temperature.
The further you turn the dial upward, the warmer the seat becomes.
■The seat heaters can be used when
The engine switch is in the ON position.
■When not in use
Turn the dial fully downward. The indicator turns off.
CAUT ...
