Toyota Tacoma 2015-2018 Service Manual: Problem Symptoms Table
PROBLEM SYMPTOMS TABLE
NOTICE:
When replacing the skid control ECU (brake actuator assembly), sensor, etc., turn the ignition switch off.
HINT:
- Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.
- Inspect the fuses and relays related to this system before inspecting the suspected areas below.
|
Symptom |
Suspected Area |
See page |
|---|---|---|
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ABS, BA and/or EBD does not operate efficiently |
Check for DTCs again and make sure that the normal system code is output. |
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Power source circuit (low power supply voltage malfunction) |
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Power source circuit (high power supply voltage malfunction) |
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Front speed sensor circuit (comparison malfunction) |
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Front speed sensor circuit (open or short malfunction) |
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Front speed sensor circuit (output malfunction) |
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Rear speed sensor circuit (comparison malfunction) |
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Rear speed sensor circuit (open or short malfunction) |
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Rear speed sensor circuit (output malfunction) |
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Check the skid control ECU (brake actuator assembly) with the Techstream. (Check skid control ECU (brake actuator assembly) operation using the Active Test function.) If abnormal, check the hydraulic circuit for leaks. |
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If the symptoms still occur even after the above circuits in suspected areas have been inspected and proved to be normal, replace the skid control ECU (brake actuator assembly). |
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Check for DTCs again and make sure that the normal system code is output. |
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Front speed sensor circuit (comparison malfunction) |
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Front speed sensor circuit (open or short malfunction) |
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Front speed sensor circuit (output malfunction) |
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Rear speed sensor circuit (comparison malfunction) |
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Rear speed sensor circuit (open or short malfunction) |
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Rear speed sensor circuit (output malfunction) |
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Stop light switch circuit |
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Check the skid control ECU (brake actuator assembly) with the Techstream. (Check skid control ECU (brake actuator assembly) operation using the Active Test function.) If abnormal, check the hydraulic circuit for leaks. |
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If the symptoms still occur even after the above circuits in suspected areas have been inspected and proved to be normal, replace the skid control ECU (brake actuator assembly). |
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ABS sensor DTC check cannot be done |
Check for DTCs again and make sure that the normal system code is output. |
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TC and CG terminal circuit*2 |
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If the symptoms still occur even after the above circuit in the suspected area has been inspected and proved to be normal, replace the skid control ECU (brake actuator assembly). |
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ABS warning light abnormal (Remains on) |
ABS warning light circuit |
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Skid control ECU (brake actuator assembly) |
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ABS warning light abnormal (Does not come on) |
ABS warning light circuit |
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Skid control ECU (brake actuator assembly) |
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Brake warning light abnormal (Remains on) |
Brake warning light circuit |
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Skid control ECU (brake actuator assembly) |
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Brake warning light abnormal (Does not come on) |
Brake warning light circuit |
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Skid control ECU (brake actuator assembly) |
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VSC and/or TRAC does not operate |
Check for DTCs again and make sure that the normal system code is output. |
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Power source circuit (low power supply voltage malfunction) |
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Power source circuit (high power supply voltage malfunction) |
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Check the hydraulic circuit for leaks. |
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Front speed sensor circuit (comparison malfunction) |
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Front speed sensor circuit (open or short malfunction) |
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Front speed sensor circuit (output malfunction) |
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Rear speed sensor circuit (comparison malfunction) |
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Rear speed sensor circuit (open or short malfunction) |
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Rear speed sensor circuit (output malfunction) |
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Yaw rate and acceleration sensor (airbag sensor assembly) circuit (zero point malfunction) |
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Yaw rate and acceleration sensor (airbag sensor assembly) circuit (power supply malfunction) |
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Acceleration sensor (airbag sensor assembly) circuit (comparison malfunction) |
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Yaw rate sensor (airbag sensor assembly) circuit (comparison malfunction) |
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Yaw rate and acceleration sensor (airbag sensor assembly) circuit (stuck or output malfunction) |
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Yaw rate and acceleration sensor (airbag sensor assembly) circuit (internal malfunction) |
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Steering angle sensor (Spiral cable with sensor sub-assembly) circuit (zero point malfunction) |
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Steering sensor (Spiral cable with sensor sub-assembly) circuit (Zero point initialization or calibration malfunction) |
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Steering angle sensor (Spiral cable with sensor sub-assembly) circuit (power supply malfunction) |
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Steering angle sensor (Spiral cable with sensor sub-assembly) circuit (output malfunction) |
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Steering angle sensor (Spiral cable with sensor sub-assembly) circuit (internal malfunction) |
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If the symptoms still occur even after the above circuit in suspected areas have been inspected and proved to be normal, replace the skid control ECU (brake actuator assembly). |
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VSC sensor DTC check cannot be done |
Check for DTCs again and make sure that the normal system code is output. |
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TC and CG terminal circuit*2 |
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If the symptoms still occur even after the above circuit in suspected areas has been inspected and proved to be normal, replace the skid control ECU (brake actuator assembly). |
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VSC OFF switch abnormal |
VSC OFF switch circuit |
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Skid control ECU (brake actuator assembly) |
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AUTO LSD indicator light abnormal (Remains on) |
AUTO LSD indicator circuit |
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Skid control ECU (brake actuator assembly) |
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AUTO LSD indicator light abnormal (Does not come on) |
AUTO LSD indicator circuit |
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Skid control ECU (brake actuator assembly) |
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Slip indicator light abnormal (Remains on) |
Slip indicator light circuit |
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Skid control ECU (brake actuator assembly) |
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The rear differential lock indicator light blinks when the rear differential cannot be unlocked for 2 consecutive trips.*1 |
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Slip indicator light abnormal (Does not come on) |
Slip indicator light circuit |
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Skid control ECU (brake actuator assembly) |
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Sensor check cannot be done |
TS and CG terminal circuit*2 |
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Skid control ECU (brake actuator assembly) |
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VSC warning buzzer abnormal |
VSC warning buzzer circuit |
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Skid control ECU (brake actuator assembly) |
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.gif)
- *1: w/ Rear Differential Lock
- *2: w/o Toyota Safety Sense P
Test Mode Procedure
TEST MODE PROCEDURE
1. WARNING LIGHT AND INDICATOR LIGHT INITIAL CHECK
(a) When the ignition switch is turned ON, check that the ABS warning, brake
warning, and slip indicator lights come on for a ...
Diagnosis System
DIAGNOSIS SYSTEM
1. DESCRIPTION
When troubleshooting a vehicle with the diagnosis system, the only difference
from the usual troubleshooting procedure is connecting the Techstream to the vehicle
...
Other materials:
Brake System (P157800)
DESCRIPTION
This DTC is stored when a malfunction is detected in the vehicle stability control
system.
DTC No.
Detection Item
DTC Detection Condition
Trouble Area
MIL
P157800
Brake System
While the igni ...
Data List / Active Test
DATA LIST / ACTIVE TEST
NOTICE:
In the table below, the values listed under "Normal Condition" are reference
values. Do not depend solely on these reference values when deciding whether a part
is faulty or not.
HINT:
Using the Techstream to read the Data List allows the values or s ...
Ptc Heater Relay
Components
COMPONENTS
ILLUSTRATION
Inspection
INSPECTION
PROCEDURE
1. INSPECT PTC HEATER RELAY
(a) Check the resistance.
(1) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
C ...