Toyota Tacoma (2015-2018) Service Manual: 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 and reading various data output from the vehicle's skid control ECU (brake actuator assembly).
The skid control ECU (brake actuator assembly) records DTCs when the ECU detects a malfunction in the ECU itself or in its circuits.
To check the DTCs, connect the Techstream to the DLC3 on the vehicle. The Techstream enables you to clear the DTCs, activate the various actuators, and check the Freeze Frame Data and Data List.
(a) Check the battery voltage.
Standard voltage:
11 to 14 V
If the voltage is below 11 V, recharge the battery before proceeding to the next step.
(b) Check the DLC3 (See page .gif)
).
2. DIAGNOSIS
(a) If the skid control ECU (brake actuator assembly) detects a malfunction, the ABS warning, brake warning and/or slip indicator lights will come on in order to warn the driver.
(b) The DTCs are simultaneously stored in memory. The DTCs can be read by connecting
SST between terminals TC and CG of the DLC3 and observing the blinking pattern of
the ABS warning and slip indicator lights, or by connecting the Techstream (See
page ).
(c) This system has a Test Mode (signal check) function (See page
).
3. WARNING LIGHT AND INDICATOR LIGHT INITIAL CHECK
(a) When the ignition switch is turned to ON, check that the ABS warning, brake warning, and slip indicator lights come on for approximately 3 seconds.
HINT:
- When the brake fluid level is low, the brake warning light comes on.
- If any of the indicators remains on or does not come on, proceed to troubleshooting for the light circuits listed below.
|
Trouble Area |
See procedure |
|---|---|
|
ABS warning light circuit (Remains on) |
|
|
ABS warning light circuit (Does not come on) |
|
|
Brake warning light circuit (Remains on) |
|
|
Brake warning light circuit (Does not come on) |
|
|
Slip indicator light circuit (Remains on) |
|
|
Slip indicator light circuit (Does not come on) |
|
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 ...
Terminals Of Ecu
TERMINALS OF ECU
Text in Illustration
*a
Component without harness connected
(Skid Control ECU [Brake Actuator Assembly])
-
-
Ter ...
Other materials:
Initialization
INITIALIZATION
1. INITIALIZE SLIDING ROOF SYSTEM
NOTICE:
Before starting this operation, make sure that the guide rails are not
deformed and there is no foreign matter on the guide rails.
When the sliding roof glass sub-assembly or sliding roof drive cable
sub-assembly is adju ...
On-vehicle Inspection
ON-VEHICLE INSPECTION
PROCEDURE
1. CHECK BATTERY CONDITION
NOTICE:
If the battery is weak or if the engine is difficult to start, recharge the battery
and perform inspections again before returning the vehicle to the customer.
(a) Check the battery for damage or deformation. If severe damage, ...
Problem Symptoms Table
PROBLEM SYMPTOMS TABLE
NOTICE:
Before replacing the ECM, refer to Registration.
w/o Smart Key System: Click here
w/ Smart Key System: Click here
When the millimeter wave radar sensor assembly is replaced with a new
one, adjustment of the radar sensor beam axis must be ...
