Toyota Tacoma (2015-2018) Service Manual: Fail-safe Chart
FAIL-SAFE CHART
1. FAIL-SAFE OPERATION AND DEACTIVATION CONDITION
TOUCH SELECT 2-4 AND HIGH-LOW SYSTEM|
DTC No. |
Fail-safe Operation |
Fail-safe Deactivation Condition |
|---|---|---|
|
U0100 |
Switching between H4 and L4 prohibited (shift position N*1 or neutral*2 signal interrupted) |
CAN communication signal from ECM is received and ignition switch is turned from off to ON |
|
U0122 |
All switching prohibited When rear differential is set to lock, rear differential switches to free*3 |
CAN communication signal from skid control ECU is received and ignition switch is turned from off to ON |
|
U0416 |
Switching from 2WD to H4 and rear differential free to lock*3 prohibited When rear differential is set to lock, rear differential switches to free*3 |
Wheel speed sensor malfunction signals from skid control ECU return to normal and ignition switch is turned from off to ON |
|
P163B |
All switching prohibited When rear differential is set to lock, rear differential switches to free*3 |
4 wheel drive control ECU internal circuit returns to normal and ignition switch is turned from off to ON |
|
P17A0 |
All switching prohibited When rear differential is set to lock, rear differential switches to free*3 |
Recovers from open circuit in A.D.D. shift motor drive circuit and ignition switch is turned from off to ON |
|
P17A4 |
Switching between 2WD and H4 prohibited |
A.D.D. actuator limit switch and A.D.D. position switch (3 circuits) signals return to normal and ignition switch is turned from off to ON |
|
P17A8 |
All switching prohibited When rear differential is set to lock, rear differential switches to free*3 |
Recovers from open circuit in transfer shift motor drive circuit and ignition switch is turned from off to ON |
|
P17A9 |
All switching prohibited When rear differential is set to lock, rear differential switches to free*3 |
Recovers from short to ground in transfer shift motor and A.D.D. shift motor*3 drive circuits and ignition switch is turned from off to ON |
|
P17AA |
All switching prohibited When rear differential is set to lock, rear differential switches to free*3 |
Recovers from short to B+ in transfer shift motor and A.D.D. shift motor*3 drive circuits and ignition switch is turned from off to ON |
|
P17AC |
All switching prohibited When rear differential is set to lock, rear differential switches to free*3 |
Transfer shift actuator limit switch signal returns to normal and ignition switch is turned from off to ON |
|
P17C7 |
- |
Front differential oil temperature sensor enters normal range |
|
P17C8 |
- |
Front differential oil temperature sensor enters normal range |
|
P2772 |
- |
Normal signal from transfer shift actuator L4 detection switch input for 1 second and ignition switch is turned from off to ON |
|
P279E |
All switching prohibited When rear differential is set to lock, rear differential switches to free*3 |
Normal signal from transfer position switch input for 1 second and ignition switch is turned from off to ON |
- *1: for Automatic Transmission
- *2: for Manual Transmission
- *3: w/ Differential Lock
Data List / Active Test
DATA LIST / ACTIVE TEST
NOTICE:
In the table below, the values listed under "Normal Condition" are reference
values. Do not depend solely on these reference values when deciding whether ...
Freeze Frame Data
FREEZE FRAME DATA
1. FREEZE FRAME DATA
(a) When a DTC is stored, the 4 wheel drive control ECU stores the current vehicle
state as Freeze Frame Data.
HINT:
Freeze Frame Data at the time a DTC is ...
Other materials:
4wd Control Ecu
Components
COMPONENTS
ILLUSTRATION
Installation
INSTALLATION
PROCEDURE
1. INSTALL 4 WHEEL DRIVE CONTROL ECU
(a) Engage the 2 guides to install the 4 wheel drive control ECU.
(b) Install the 2 bolts.
Torque:
5.0 N·m {51 kgf·cm, 44 in·lbf}
(c) Connect the 2 connectors.
2. INSTALL ...
System Description
SYSTEM DESCRIPTION
1. FUNCTION DESCRIPTION
(a) ABS (Anti-lock Brake System)
(1) The ABS helps prevent the wheels from locking when the brakes are applied
firmly or when braking on a slippery surface.
(b) EBD (Electronic Brake force Distribution)
(1) The EBD control utilizes ABS, and performs ...
Ambient Temperature Sensor Circuit (B1412/12)
DESCRIPTION
The ambient temperature sensor is installed in front of the condenser to detect
the ambient temperature which is used to control the air conditioning system AUTO
mode. This sensor is connected to the air conditioning amplifier assembly and detects
fluctuations in the ambient tempe ...
