Toyota Tacoma 2015-2018 Service Manual: Fail-safe Chart
FAIL-SAFE CHART
1. FAIL-SAFE OPERATION AND DEACTIVATION CONDITION
DIFFERENTIAL SYSTEM (w/ Differential Lock)|
DTC No. |
Fail-safe Operation |
Fail-safe Deactivation Condition |
|---|---|---|
|
U0122 |
All switching prohibited When rear differential is locked, rear differential switches to free |
CAN communication signal from skid control ECU is received and ignition switch is turned from off to ON |
|
U0416 |
for 4WD: Switching from 2WD to H4 and rear differential free to locked prohibited When rear differential is locked, rear differential switches to free for 2WD: Switching from rear differential free to locked prohibited When rear differential is locked, rear differential switches to free |
Wheel speed sensor malfunction signals from skid control ECU return to normal and ignition switch is turned from off to ON |
|
P163B |
for 4WD: Switching from 2WD to H4 and rear differential free to locked prohibited When rear differential is locked, rear differential switches to free for 2WD: Switching from rear differential free to locked prohibited When rear differential is locked, rear differential switches to free |
4 wheel drive control ECU internal circuit returns to normal and ignition switch is turned from off to ON |
|
P17BB |
Switching from rear differential free to locked prohibited When rear differential is locked, rear differential switches to free |
Differential lock indicator switch signal returns to normal and ignition switch is turned from off to ON |
|
P17BC |
Switching from rear differential free to locked prohibited When rear differential is locked, rear differential switches to free |
Differential lock indicator switch signal returns to normal and ignition switch is turned from off to ON |
|
P17C0 |
Switching from rear differential free to locked prohibited When rear differential is locked, rear differential switches to free |
Differential lock coil drive circuit of rear differential recovers from ground short and ignition switch is turned from off to ON |
|
P17C1 |
Switching from rear differential free to locked prohibited When rear differential is locked, rear differential switches to free |
Differential lock coil drive circuit of rear differential recovers from battery short and ignition switch is turned from off to ON |
|
P17CC |
Switching from rear differential free to locked prohibited When rear differential is locked, rear differential switches to free |
Differential lock switch signal returns to normal and ignition switch is turned from off to ON |
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) ...
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:
Lost Communication with ECM / PCM "A" (U0100,U0125,U0126,U0129)
DESCRIPTION
These DTCs are stored when a communication malfunction occurs between ECUs that
perform pre-collision system control.
DTC No.
Detection Item
DTC Detection Condition
Trouble Area
U0100
Lost Communication with ECM ...
Pump Motor Relay (C1253)
DESCRIPTION
The motor relay (semiconductor relay) is built into the master cylinder solenoid
and drives the pump motor based on a signal from the skid control ECU (master cylinder
solenoid).
DTC No.
DTC Detecting Condition
Trouble Areas
C1253
...
On-vehicle Inspection
ON-VEHICLE INSPECTION
PROCEDURE
1. INSPECT FRONT SEAT AIRBAG ASSEMBLY LH (for Vehicle not Involved in Collision)
(a) Perform a diagnostic system check (See page
).
(b) With the front seat airbag assembly LH installed on the vehicle, perfor ...