Toyota Tacoma (2015-2018) Service Manual: Downhill Assist Control Switch Malfunction (Test Mode DTC) (C1379)
DESCRIPTION
DTC C1379 is cleared when the crawl control switch sends a crawl control operation signal or when test mode ends.
|
DTC Code |
DTC Detection Condition |
Trouble Area |
|---|---|---|
|
C1379 |
Stored only during test mode. |
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
- When replacing the skid control ECU (master cylinder solenoid), perform
calibration (See page
.gif)
). - Inspect the fuses for circuits related to this system before performing the following inspection procedure.
PROCEDURE
|
1. |
READ VALUE USING TECHSTREAM (CRAWL CONTROL SWITCH) |
(a) Turn the ignition switch off.
(b) Connect the Techstream to the DLC3.
(c) Turn the ignition switch to ON.
(d) Turn the Techstream on.
(e) Enter the following menus: Chassis / ABS/VSC/TRAC / Data List.
(f) Check the Data List for proper functioning of the crawl control switch.
ABS/VSC/TRAC|
Tester Display |
Measurement Item/Range |
Normal Condition |
Diagnostic Note |
|---|---|---|---|
|
Crawl Control Switch |
Crawl speed selector switch status/ LOW, MIDLOW, MID, MIDHIGH or HIGH |
Actual crawl speed selector switch position |
- |
OK:
The Techstream displays according to crawl control switch operation.
| NG | .gif) |
GO TO STEP 3 |
|
.gif)
|
2. |
CHECK TEST MODE DTC |
(a) Perform the crawl control switch check in the Test Mode Procedure (See page
).
OK:
Test mode DTC C1379 is cleared.
| OK | |
USE SIMULATION METHOD TO CHECK |
| NG | |
REPLACE MASTER CYLINDER SOLENOID |
|
3. |
INSPECT DRIVE MONITOR SWITCH |
(a) Remove the crawl control switch (drive monitor switch) (See page
).
(b) Inspect the crawl control switch (drive monitor switch) (See page
).
| NG | |
REPLACE DRIVE MONITOR SWITCH |
|
|
4. |
INSPECT ROOF CONSOLE BOX ASSEMBLY |
(a) Remove the roof console box assembly.
- for Double Cab: (See page
)
- for Access Cab: (See page
)
Text in Illustration
|
*a |
Component without harness connected (Roof Console Box Assembly) |
- |
- |
(b) Measure the resistance according the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
R44-1 (SWI3) - 2 |
Always |
Below 1 Ω |
|
R44-3 (DN) - 7 |
Always |
Below 1 Ω |
|
R44-4 (ECU) - 6 |
Always |
Below 1 Ω |
|
R44-5 (UP) - 3 |
Always |
Below 1 Ω |
|
R44-12 (GND) - 5 |
Always |
Below 1 Ω |
|
Result |
Proceed to |
|---|---|
|
OK |
A |
|
NG (for Double Cab) |
B |
|
NG (for Access Cab) |
C |
| A | |
REPAIR OR REPLACE HARNESS OR CONNECTOR (MASTER CYLINDER SOLENOID - ROOF CONSOLE BOX ASSEMBLY) |
| B | |
REPLACE ROOF CONSOLE BOX ASSEMBLY |
| C | |
REPLACE ROOF CONSOLE BOX ASSEMBLY |
Diameter of the Tire is not Uniform (C1337)
DESCRIPTION
The skid control ECU (master cylinder solenoid) measures the speed of each wheel
by receiving signals from the speed sensors. These signals are used for recognizing
whether all 4 whee ...
Acceleration Sensor Power Supply Voltage Malfunction (C1381)
DESCRIPTION
The skid control ECU (master cylinder solenoid) receives signals from the yaw
rate and acceleration (airbag sensor assembly) via the CAN communication system.
The airbag sensor assembl ...
Other materials:
Transponder Chip Malfunction (B2793,B2794,B2797,B2798)
DESCRIPTION
DTC B2793 is stored when a malfunction is found in the key during key
code registration or a key code is not registered normally. Replace the
key if key code registration cannot be performed normally and this DTC is
output.
DTC B2794 is stored when a key with an i ...
Transfer Case Rear Oil Seal
Components
COMPONENTS
ILLUSTRATION
Replacement
REPLACEMENT
PROCEDURE
1. DRAIN TRANSFER OIL
2. REMOVE PROPELLER WITH CENTER BEARING SHAFT ASSEMBLY
(See page )
3. REMOVE OUTPUT SHAFT COMPANION FLANGE SUB-ASSEMBLY
4. REMOVE TRANSFER EXTENSION HOUSING TYPE T OIL SEAL
( ...
System Diagram
SYSTEM DIAGRAM
Transmitting ECU (Transmitter)
Receiving ECU
Signal
Communication Method
4 wheel drive control ECU
Skid control ECU (Brake actuator assembly)
High-Low actuator fail
4WD status ...
