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.
|
Symptom |
Suspected Area |
See page |
|---|---|---|
|
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 |
|
|
CAN communication system |
|
|
|
Combination meter assembly |
||
|
Transfer position switch |
||
|
4 wheel drive control ECU |
||
|
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 |
|
|
Clutch start switch circuit (for Manual Transmission) |
|
|
|
Transfer position switch |
|
|
|
4 wheel drive control ECU |
||
|
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 |
|
|
Transfer position switch |
|
|
|
4 wheel drive control ECU |
||
|
CAN communication system |
||
|
The 4WD indicator light (green) continues blinking after the transfer position switch is operated |
ECU power source circuit |
|
|
Transfer shift actuator assembly (transfer shift motor) |
|
|
|
A.D.D. actuator (differential vacuum actuator assembly) (A.D.D. shift motor) |
||
|
Transfer shift actuator assembly (limit switch, 4WD detection switch or L4 detection switch) |
||
|
A.D.D. actuator (differential vacuum actuator assembly) (limit switch or A.D.D. position switch) |
||
|
4 wheel drive control ECU |
||
|
The 4LO indicator light continues blinking after the transfer position switch is operated |
ECU power source circuit |
|
|
Clutch start switch circuit (for Manual Transmission) |
|
|
|
Transfer shift actuator assembly (transfer shift motor) |
|
|
|
Transfer shift actuator assembly (limit switch, 4WD detection switch or L4 detection switch) |
||
|
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:
Brake Warning Light does not Come ON
DESCRIPTION
Refer to Brake Warning Light Remains ON (See page
).
WIRING DIAGRAM
Refer to Brake Warning Light Remains ON (See page
).
CAUTION / NOTICE / HINT
NOTICE:
When replacing the skid control ECU (master cylinder solenoid), perform
calibration (See page
).
Inspect ...
Fail-safe Chart
FAIL-SAFE CHART
If any of the following DTCs are stored, the ECM enters fail-safe mode to allow
the vehicle to be driven temporarily.
DTC
Fail-safe Operation
Fail-safe Deactivation Condition
P161A87
Generator command is maintained
...
Lost Communication With ECM/PCM "A" Missing Message (U010087)
DESCRIPTION
The engine control unit and transmission control unit are located inside the
ECM. The engine control unit intercommunicates with the transmission control ECU
via CAN communication. If there is a problem in this intercommunication, the ECM
stores this DTC.
DTC Code
...