Toyota Tacoma (2015-2018) Service Manual: 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 proceed to the relevant troubleshooting page.
NOTICE:
When replacing the skid control ECU (master cylinder solenoid), sensor or etc., turn the ignition switch to off.
Vehicle Stability Control System|
Symptom |
Suspected Area |
See page |
|---|---|---|
|
ABS, BA and/or EBD does not operate |
Check for DTCs again and make sure that normal system code displayed. |
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IG power source circuit |
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Speed sensor circuit |
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Check hydraulic brake booster using Techstream (Check hydraulic brake booster operation using active test function) If abnormal, check hydraulic circuit for leakage |
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If symptoms still occur even after above circuits in suspected areas inspected and proved to be normal, replace master cylinder solenoid. |
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|
ABS, BA and/or EBD does not operate efficiently |
Check for DTCs again and make sure that normal system code displayed. |
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|
Speed sensor circuit |
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|
Stop light switch circuit |
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Check hydraulic brake booster using Techstream (Check hydraulic brake booster operation using active test function) If abnormal, check hydraulic circuit for leakage |
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If symptoms still occur even after above circuits in suspected areas inspected and proved to be normal, replace master cylinder solenoid. |
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|
VSC and/or TRAC does not operate |
Check for DTCs again and make sure that normal system code displayed. |
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IG power source circuit |
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Check hydraulic circuit for leakage |
- |
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Speed sensor circuit |
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Yaw rate and acceleration sensor circuit |
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Steering angle sensor circuit |
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VSC OFF switch circuit |
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If symptoms still occur even after above circuits in suspected areas inspected and proved to be normal, replace master cylinder solenoid. |
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|
Sensor signal check cannot be performed |
Master cylinder solenoid |
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|
DTC check cannot be performed |
Check for DTCs again and make sure that normal system code displayed. |
|
|
If symptoms still occur even after above circuits in suspected areas inspected and proved to be normal, replace master cylinder solenoid. |
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|
ABS warning light remains on |
ABS warning light circuit |
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Master cylinder solenoid |
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|
ABS warning light does not come on |
ABS warning light circuit |
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Master cylinder solenoid |
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BRAKE warning light remains on |
BRAKE warning light circuit |
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Master cylinder solenoid |
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BRAKE warning light does not come on |
BRAKE warning light circuit |
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Master cylinder solenoid |
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TRAC OFF indicator light remains on |
TRAC OFF indicator light circuit |
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Master cylinder solenoid |
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TRAC OFF indicator light does not come on |
TRAC OFF indicator light circuit |
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Master cylinder solenoid |
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VSC OFF indicator light remains on |
VSC OFF indicator circuit |
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Master cylinder solenoid |
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VSC OFF indicator light does not come on |
VSC OFF indicator circuit |
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Master cylinder solenoid |
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|
AUTO LSD indicator light remains on |
AUTO LSD indicator circuit |
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Master cylinder solenoid |
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AUTO LSD indicator light does not come on |
AUTO LSD indicator circuit |
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Master cylinder solenoid |
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Slip indicator light remains on |
Slip indicator light circuit |
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Master cylinder solenoid |
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Slip indicator light does not come on |
Slip indicator light circuit |
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Master cylinder solenoid |
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A-TRAC indicator light remains on*1 |
A-TRAC indicator light circuit |
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Master cylinder solenoid |
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A-TRAC indicator light does not come on*1 |
A-TRAC indicator light circuit |
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Master cylinder solenoid |
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Crawl indicator light abnormal (Remains on)*2 |
Crawl indicator light circuit |
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Master cylinder solenoid (skid control ECU) |
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Crawl indicator light abnormal (Does not come on)*2 |
Crawl indicator light circuit |
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Master cylinder solenoid (skid control ECU) |
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Multi-terrain select indicator light abnormal (Remains on)*2 |
Multi-terrain select indicator light circuit |
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Master cylinder solenoid |
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Multi-terrain select indicator light abnormal (Does not come on)*2 |
Multi-terrain select indicator light circuit |
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Master cylinder solenoid |
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VSC warning buzzer abnormal |
VSC warning buzzer circuit |
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Master cylinder solenoid |
|
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- *1: for Manual Transmission
- *2: for Automatic Transmission
Calibration
CALIBRATION
1. DESCRIPTION
(a) After replacing the VSC relevant components or performing "Front wheel alignment
adjustment", clearing and reading the sensor calibration data are necessar ...
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 si ...
Other materials:
Open Circuit in IG1/IG2 Power Source Circuit (C1242)
DESCRIPTION
If there is a problem with the skid control ECU (master cylinder solenoid) power
supply circuit, the skid control ECU outputs the DTC and prohibits operation under
the fail safe function.
If the voltage supplied to terminal IG1 and/or IG2 is not within the DTC detection
threshold ...
Downhill Assist Control system
The downhill assist control system helps to prevent excessive speed on steep
downhill descents.
■ System operation
The system will operate when the vehicle is traveling under 15 mph (25 km/h)
and the front-wheel drive control switch is in the L4 position.
Press the DAC switch. The ind ...
Installation
INSTALLATION
CAUTION / NOTICE / HINT
PROCEDURE
1. INSTALL REAR AIRBAG SENSOR LH
(a) Check that the ignition switch is OFF.
(b) Check that the cable is disconnected from the battery negative (-) terminal.
CAUTION:
After disconnecting the cable from the terminal, wait for at least 90 seconds
...
