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:
Stop Light Switch OFF Stuck Malfunction (C1426)
DESCRIPTION
The skid control ECU (brake actuator assembly) inputs the stop light signal and
brake operation condition. When the brake pedal is depressed and the stop light
switch signal is not input, C1426 is output.
DTC No.
Detection Item
DTC Detection Conditi ...
Inspection
INSPECTION
PROCEDURE
1. INSPECT HAZARD WARNING SIGNAL SWITCH ASSEMBLY (AIR CONDITIONING CONTROL ASSEMBLY)
(a) Check the resistance.
(1) Measure the resistance according to the value(s) in the table below.
Text in Illustration
*a
Component withou ...
Rear Body Side Panel Protector
Components
COMPONENTS
ILLUSTRATION
ILLUSTRATION
Installation
INSTALLATION
CAUTION / NOTICE / HINT
HINT:
Use the same procedure for the RH side and LH side.
The following procedure is for the LH side.
PROCEDURE
1. INSTALL REAR BODY SIDE PANEL PROTECTOR
(a) for Sho ...