Toyota Tacoma (2015-2018) Service Manual: Test Mode Procedure

Toyota Tacoma (2015-2018) Service Manual / Brake Control / Dynamic Control Systems / Vehicle Stability Control System(for Hydraulic Brake Booster) / Test Mode Procedure

TEST MODE PROCEDURE

1. TEST MODE PROCEDURE (for Using Techstream)

HINT:

If the ignition switch is turned from the ON to the ACC or LOCK position during test mode, DTCs related to the signal check function will be cleared.
During test mode, the skid control ECU (master cylinder solenoid) records all DTCs related to the signal check function. By performing the signal check, the codes are cleared if normality is confirmed. The codes left over are the codes where an abnormality was found.

(a) Turn the ignition switch to off.

(b) Check that the steering wheel is in the straight-ahead position.

Check that the shift lever is in P and apply the parking brake.

(d) for Manual Transmission:

Check that the shift lever is in neutral and apply the parking brake.

(e) Connect Techstream to the DLC3.

(f) Turn the ignition switch to ON.

(g) Switch the ECU to test mode using Techstream. Enter the following menu items: Chassis / ABS/VSC/TRAC / Utility / Signal Check.

(h) Check that the ABS warning light and slip indicator light blink at 0.125 second intervals (0.125 seconds on and 0.125 seconds off).

HINT:

If the ABS warning light and slip indicator light do not blink the ABS warning light circuit and slip indicator light circuit.

Trouble Area	See Page
ABS warning light circuit
Slip indicator light circuit

Trouble Area

See Page

ABS warning light circuit

Slip indicator light circuit

(i) Start the engine.

2. ACCELERATION SENSOR SIGNAL CHECK

(a) Keep the vehicle stationary on a level surface for 1 second or more.

HINT:

Acceleration sensor check can be performed with the master cylinder pressure sensor check below.

3. MASTER CYLINDER PRESSURE SENSOR CHECK

(a) Keep the vehicle stationary and release the brake pedal for 1 second or more, and quickly depress the brake pedal with a force of 98 N (10 kgf) or more for 1 second or more.

Keep the vehicle stationary and release the brake pedal for 1 second or more, and quickly depress the brake pedal with a force of 98 N (10 kgf) or more for 1 second or more.
While the ABS warning light stays on, continue to depress the brake pedal with a force of 98 N (10 kgf) or more.
The ABS warning light comes on for 3 seconds every time the above brake pedal operation is performed.

4. 4WD DETECTION SWITCH SIGNAL CHECK

(a) Check the 4WD detection switch (4WD position).

(1) Push and turn the 4 wheel drive control switch to put the vehicle in 4WD mode.

(2) Push and turn the 4 wheel drive control switch to put the vehicle in 2WD mode.

5. SPEED SENSOR CHECK

(a) Check the speed sensor signal

(1) Drive the vehicle straight forward at a speed of 45 km/h (28 mph) or more for several seconds.

(2) Check that the ABS warning light goes off.

(3) Drive the vehicle in reverse for more than 1 second at 3 km/h (2 mph) or more.

HINT:

Drive the vehicle in reverse and check the speed sensor signal. Note that the signal check cannot be completed if the vehicle speed is 45 km/h (28 mph) or more.

(4) Check that the ABS warning light goes off.

HINT:

The sensor check may not be completed if wheelspin occurs.
The ABS warning light blinks when the sensor check has been completed and the brake pedal is depressed.
The ABS warning light comes on immediately after a malfunction has been detected during the speed sensor check.

(5) Stop the vehicle.

NOTICE:

Before performing the speed sensor signal check, complete the acceleration sensor, master cylinder pressure sensor and 4WD detection switch signal checks.
The speed sensor signal check may not be completed if the speed sensor signal check is started while turning the steering wheel or spinning the wheels.
After the ABS warning light goes off, if the vehicle speed exceeds 45 km/h (28 mph), a signal check code will be stored again. Decelerate or stop the vehicle before the speed reaches 45 km/h (28 mph).
If the signal check has not been completed, the ABS warning light blinks while driving and the ABS system does not operate.

HINT:

When the signal check has been completed, the ABS warning light goes off while driving and blinks in test mode while stationary.

6. END OF ABS SENSOR CHECK

(a) If the sensor check is completed, the ABS warning light blinks (Test Mode) when the vehicle stops and the ABS warning light is off while the vehicle is driving.

NOTICE:

When the yaw rate and acceleration sensor, speed sensor, and master cylinder pressure sensor checks are completed, the sensor check is completed.
If the sensor check is not completed, the ABS warning light blinks even while the vehicle is driving and the ABS does not operate.

7. READ DTC OF ABS SENSOR (for Using Techstream)

(a) Read the DTC(s) by following the Techstream screen.

HINT:

Refer to Techstream operator's manual for further details.

8. MTS SET SWITCH SIGNAL CHECK (for Automatic transmission)

(a) Turn the 4 wheel drive control switch to the L position to put the vehicle in L4 mode.

(b) Press the MTS SET switch.

(d) Press the MTS SET switch again to turn the MTS SET indicator light off.

HINT:

Move the vehicle either a little forward or a little backward to engage the L4 position.

9. CRAWL SWITCH CHECK (for Automatic transmission)

(a) Push the ON/OFF switch.

HINT:

The CRAWL indicator light illuminates while the ON/OFF switch is pushed.

Text in Illustration

*a	Drive Monitor Switch
*b	ON/OFF Switch
*c	Speed Selector Switch

(b) Turn the speed selector switch to low.

Text in Illustration

*a	Low
*b	Medium-low
*c	Medium
*d	Medium-high
*e	High

(d) Turn the speed selector switch to medium.

(e) Turn the speed selector switch to medium-high.

(f) Turn the speed selector switch to high.

(g) Turn the speed selector switch to low.

10. VSC OFF SWITCH CHECK

(a) Press the VSC OFF switch.

(b) Check that the AUTO LSD indicator light and VSC OFF indicator light come on.

11. END OF VSC SENSOR CHECK

(a) If the sensor check is completed, the slip indicator light blinks (Test Mode).

NOTICE:

If the sensor check is not completed, the slip indicator light blinks even while the vehicle is driving and the VSC and traction control function do not operate.

12. READ DTC OF VSC SENSOR (for Using Techstream)

(a) Read the DTC(s) by following the Techstream screen.

Refer to Techstream operator's manual for further details.

13. DTC OF SIGNAL CHECK FUNCTION

ABS Sensor

DTC No.	Diagnosis	Trouble Area
C1271	Low output voltage of front speed sensor RH	Front speed sensor RH Sensor installation Front speed sensor rotor RH (front axle with ABS rotor bearing assembly RH)
C1272	Low output voltage of front speed sensor LH	Front speed sensor LH Sensor installation Front speed sensor rotor LH (front axle with ABS rotor bearing assembly LH)
C1273	Low output voltage of rear speed sensor RH	Rear speed sensor RH Sensor installation Rear speed sensor rotor RH (rear axle hub and bearing assembly RH)
C1274	Low output voltage of rear speed sensor LH	Rear speed sensor LH Sensor installation Rear speed sensor rotor LH (rear axle hub and bearing assembly LH)
C1275	Abnormal change in output voltage of front speed sensor RH	Front speed sensor rotor RH (front axle with ABS rotor bearing assembly RH)
C1276	Abnormal change in output voltage of front speed sensor LH	Front speed sensor rotor LH (front axle with ABS rotor bearing assembly LH)
C1277	Abnormal change in output voltage of rear speed sensor RH	Rear speed sensor rotor RH (rear axle hub and bearing assembly RH)
C1278	Abnormal change in output voltage of rear speed sensor LH	Rear speed sensor rotor LH (rear axle hub and bearing assembly LH)
C1279	Deceleration sensor faulty	Yaw rate and acceleration sensor (airbag sensor assembly) Sensor installation
C1281	Master cylinder pressure sensor output malfunction	Master cylinder pressure sensor (hydraulic brake booster) Skid control ECU (master cylinder solenoid) Stop light switch circuit
C1282	4WD detection switch malfunction	4WD detection switch (differential vacuum actuator assembly)

VSC Sensor

DTC No.	Diagnosis	Trouble Areas
C1379*	Malfunction in CRAWL switch	CRAWL switch

*: for Automatic Transmission

HINT:

The codes in this table are output only in test mode (signal check).

Problem Symptoms Table

PROBLEM SYMPTOMS TABLE If a normal code is displayed during the DTC check but the problem still occurs, check the circuits for each problem symptom in the order given in the table below and proce ...

Terminals Of Ecu

TERMINALS OF ECU 1. TERMINALS OF ECU Text in Illustration *a Component without harness connected (Skid Control ECU (Master Cylinder Solenoid)) - - ...

Other materials:

Inspection
INSPECTION PROCEDURE 1. INSPECT RADIATOR CORE SUB-ASSEMBLY Check the core plate for damage. Text in Illustration *1 Core Plate *2 Radiator Core If the sides of the core plate groove are deformed, it is impossible to reassem ...

Installation
INSTALLATION PROCEDURE 1. INSTALL REAR BRAKE DRUM SUB-ASSEMBLY (a) Install a new drum gasket onto the rear brake drum. (b) Install the rear brake drum. 2. ADJUST REAR DRUM BRAKE SHOE CLEARANCE (a) Provisionally install the hub nuts. (b) Remove the hole plug, and turn the adjuster to expand ...

Data List / Active Test
DATA LIST / ACTIVE TEST 1. DATA LIST HINT: Using the Techstream to read the Data List allows the values or states of switches, sensors, actuators and other items to be read without removing any parts. This non-intrusive inspection can be very useful because intermittent conditions or signals ...