Toyota Tacoma (2015-2018) Service Manual: Diagnosis System
DIAGNOSIS SYSTEM
1. DESCRIPTION
The 4 wheel drive control ECU records DTCs when the ECU detects a malfunction in the ECU itself or in system circuits.
The DTCs can be read through the DLC3 of the vehicle. When the system seems to be malfunctioning, use the Techstream to check for malfunctions and perform troubleshooting.
2. CHECK DLC3
(a) Inspect the battery voltage.
Standard voltage:
11 to 14 V
If the voltage is below 11 V, recharge the battery before proceeding.
(b) Check the DLC3 (See page .gif)
).
3. FUNCTION OF INDICATOR LIGHT
(a) When a problem occurs in the differential system (w/ Differential Lock), the rear differential lock indicator light on the combination meter assembly rapidly blinks* to inform the driver of the problem.
- *: 0.25 second intervals (0.25 seconds on and 0.25 seconds off)
(b) Indicator light (illuminated or blinking) or multi-information display status when DTC is output.
(1) for 4WD
DIFFERENTIAL SYSTEM (w/ Differential Lock)|
DTC No. |
Rear Differential Lock Indicator Light |
4WD Indicator Light (Green) |
4LO Indicator Light |
Multi-information Display Message |
|---|---|---|---|---|
|
U0122 |
Rear differential locked: Illuminated Rear differential free: Not illuminated |
Not illuminated |
Rapidly blinking |
2WD-4WD mode change malfunction visit your dealer |
|
U0416 |
||||
|
P163B |
Not illuminated |
Status displayed* |
||
|
P17BB |
Rapidly blinking |
Not illuminated |
Not illuminated |
- |
|
P17BC |
||||
|
P17C0 |
Rapidly blinking |
Status displayed* |
Status displayed* |
- |
|
P17C1 |
||||
|
P17CC |
Rapidly blinking |
Not illuminated |
Not illuminated |
- |
- *: Displays the 2WD/4WD mode status during a malfunction
- Rapidly blinking: Blinks at 0.25 second intervals (0.25 seconds on and 0.25 seconds off)
(2) for 2WD:
DIFFERENTIAL SYSTEM (w/ Differential Lock)|
DTC No. |
Rear Differential Lock Indicator Light |
|---|---|
|
U0122 |
Rapidly blinking |
|
U0416 |
|
|
P163B |
|
|
P17BB |
|
|
P17BC |
|
|
P17C0 |
|
|
P17C1 |
|
|
P17CC |
- Rapidly blinking: Blinks at 0.25 second intervals (0.25 seconds on and 0.25 seconds off)
4. CHECK INDICATOR LIGHT
(a) for 4WD:
With the ignition switch turned to ON and the transfer in 2WD, press the differential lock switch and check that the rear differential lock indicator light blinks* 3 times.
*: 0.5 second intervals (0.5 seconds on and 0.5 seconds off)
for 2WD:
With the ignition switch turned to ON, press the differential lock switch and check that the rear differential lock indicator light blinks* 3 times.
*: 0.5 second intervals (0.5 seconds on and 0.5 seconds off)
System Description
SYSTEM DESCRIPTION
1. DESCRIPTION
The differential system (w/ Differential Lock) directly connects the
rear left and right wheels so that even if one wheel slips while driving
where d ...
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:
Open or Short in Master Cylinder Pressure Sensor (C1421,C1423,C1424,C142A,C1449)
DESCRIPTION
DTC No.
Detection Item
DTC Detection Condition
Trouble Area
C1421
Open or Short in Master Cylinder Pressure Sensor
Any of the following is detected:
When voltage at terminal +BS is 9.5 V or ...
Lock Switch Circuit
WIRING DIAGRAM
PROCEDURE
1.
CHECK REAR DIFFERENTIAL LOCK INDICATOR LIGHT
(a) Turn the ignition switch to ON.
(b) for 4WD:
Finish switching to L4.
(c) Check the rear differential lock indicator light.
(d) Press the differential lock switch.
(e) After 60 secon ...
Steering Pad Switch Circuit
DESCRIPTION
The forward recognition camera receives a lane departure alert switch signal
from the steering pad switch assembly.
WIRING DIAGRAM
for 2TR-FE
for 2GR-FKS
CAUTION / NOTICE / HINT
NOTICE:
The vehicle is equipped with a Supplemental Restraint System (SRS) which includes
compo ...
