Toyota Tacoma (2015-2018) Service Manual: Data List / Active Test

Toyota Tacoma (2015-2018) Service Manual / Steering Column / Steering Lock System / Data List / Active Test

DATA LIST / ACTIVE TEST

1. READ 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 may be discovered before parts or wiring is disturbed. Reading the Data List information early in troubleshooting is one way to save diagnostic time.

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.

(a) Turn the engine switch off.

(b) Connect the Techstream to the DLC3.

(d) Turn the Techstream on.

(e) Enter the following menus: Body Electrical / (desired system) / Data List.

(f) According to the display on the Techstream, read the Data List.

(g) Using the Techstream, confirm the Data List items to help determine the cause of the problem.

NOTICE:

The steering lock ECU (steering lock actuator or UPR bracket assembly) communicates with the Techstream through the certification ECU (smart key ECU assembly) which uses CAN communication. If the CAN communication system or certification ECU (smart key ECU assembly) is malfunctioning, Data List items may not be normal.
When using the Techstream with the engine switch off, connect the Techstream to the vehicle and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the Techstream and the vehicle begins. Then select the vehicle type under manual mode and enter the following menus: Body Electrical / Smart Key. While using the Techstream, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the Techstream and the vehicle.

Power Source Control

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
Shift P Signal	Shift position (P) signal / ON or OFF	ON: Shift lever in P OFF: Shift lever not in P	Use this item to determine if the shift position switch is malfunctioning. The engine cannot be started when this item is "OFF".
Steering Unlock Switch	State of steering unlock sensor signal output from steering lock ECU (steering lock actuator or UPR bracket assembly) / ON or OFF	ON: Steering unlocked OFF: Steering locked	This item can be used to determine the cause of problems when the steering does not lock or unlock. HINT: The steering is considered locked when the lock sensor is ON and the unlock sensor is OFF. The steering is considered unlocked when the lock sensor is OFF and the unlock sensor is ON.
Str Lock/ Unlock Wait T-Out	Steering lock or unlock malfunction / Yes or No	Yes: Steering lock/unlock timed out (Lock bar stuck, etc.) No: Steering locks/ unlocks normally within specified time	The engine cannot be started when this item is "Yes".

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

Shift P Signal

Shift position (P) signal /

ON or OFF

ON: Shift lever in P

OFF: Shift lever not in P

Use this item to determine if the shift position switch is malfunctioning.
The engine cannot be started when this item is "OFF".

Steering Unlock Switch

State of steering unlock sensor signal output from steering lock ECU (steering lock actuator or UPR bracket assembly) /

ON or OFF

ON: Steering unlocked

OFF: Steering locked

This item can be used to determine the cause of problems when the steering does not lock or unlock.

HINT:

The steering is considered locked when the lock sensor is ON and the unlock sensor is OFF.
The steering is considered unlocked when the lock sensor is OFF and the unlock sensor is ON.

Str Lock/ Unlock Wait T-Out

Steering lock or unlock malfunction /

Yes or No

Yes: Steering lock/unlock timed out (Lock bar stuck, etc.)

No: Steering locks/ unlocks normally within specified time

The engine cannot be started when this item is "Yes".

Smart Key

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
# Codes	Number of trouble codes / 0 to 255	Number of stored DTCs displayed	-
Immobiliser	State of immobiliser system determined by certification ECU (smart key ECU assembly) / Set or Unset	Set: Immobiliser set (engine start prohibited) (engine switch off) Unset: Immobiliser unset (engine start permitted) (engine switch on (ACC) or on (IG))	When the immobiliser cannot be unset, this item can be used to determine whether the certification ECU (smart key ECU assembly) is part of the problem. The engine cannot be started when this item displays "Set". HINT: The state of the immobiliser (whether it is set or unset) can be determined through the certification ECU (smart key ECU assembly). If this item displays "Set", the communication between the certification ECU (smart key ECU assembly) and steering lock ECU (steering lock actuator or UPR bracket assembly) can be determined to be normal. The security indicator light operation is only linked with the state of the immobiliser (set/unset), and is not related to the steering lock operation (lock/ unlock), when the immobiliser is set, the security indicator light blinks.
Steering Lock Sleep Cond	steering lock ECU (steering lock actuator or UPR bracket assembly) sleep availability / Yes or No	Yes: Sleep available No: Sleep not available	-
Steering Lock Start Cond	steering lock ECU (steering lock actuator or UPR bracket assembly) wake up signal status / Yes or No	Yes: Wake up signal sent No: Wake up signal not sent	-
Engine Start Condition	State of engine start permission signal determined by steering lock ECU (steering lock actuator or UPR bracket assembly) sent to certification ECU (smart key ECU assembly) / OK or NG	OK: Engine start permitted NG: Engine start prohibited	When this item displays "OK", the certification ECU (smart key ECU assembly) has received an unlock confirmation signal from the steering lock ECU (steering lock actuator or UPR bracket assembly) and has permitted fuel injection and engine combustion. The engine cannot be started when this item displays "NG".
Sensor Value	Record of malfunction of lock or unlock sensor in steering lock ECU (steering lock actuator or UPR bracket assembly) (DTC B2781 is output) / OK or NG(Past)	OK: No record of lock/ unlock sensor malfunction in steering lock ECU (steering lock actuator or UPR bracket assembly) NG(Past): Record of lock/ unlock sensor in steering lock ECU (steering lock actuator or UPR bracket assembly) turning ON at same time exists	When this item displays "NG", the sensor inside the steering lock ECU (steering lock actuator or UPR bracket assembly) may be malfunctioning, or there may be a mechanical malfunction.
Power Supply Short	Record of malfunction of signal sent to steering lock motor (steering lock actuator assembly) from certification ECU (smart key ECU assembly) (short circuit) (DTC B2782 is output) / OK or NG(Past)	OK: No record of malfunction (short circuit) NG(Past): Record of malfunction (short circuit) exists	This item records malfunctions in the circuit between the certification ECU (smart key ECU assembly) and steering lock motor (steering lock actuator assembly).
Motor Driver Short	Record of malfunction of motor activation circuit in steering lock ECU (steering lock actuator or UPR bracket assembly) (short circuit) (DTC B2781 is output) / OK or NG(Past)	OK: No record of malfunction (short circuit) NG(Past): Record of malfunction (short circuit) exists	This item records malfunctions in the motor activation circuit inside the steering lock ECU (steering lock actuator or UPR bracket assembly) (short circuit).
Lock/Unlock Receive	Reception state of steering lock or unlock request signal from certification ECU (smart key ECU assembly) / Yes or No	Yes: Record of receiving lock or unlock request signal exists No: No record of receiving lock or unlock request signal	-
Lock Bar Stuck Error	Record of lock bar not properly unlocking after being commanded to unlock for certain amount of time / OK or NG(Past)	OK: No record of stuck lock bar NG(Past): Record of stuck lock bar exist	-
Engine Start Request	Reception state of engine start permission signal determined by steering lock ECU (steering lock actuator or UPR bracket assembly) sent to certification ECU (smart key ECU assembly) / OK or NG	OK: Receiving signal NG: Not receiving signal	When this item displays "OK", the certification ECU (smart key ECU assembly) has received an unlock confirmation signal from the steering lock ECU (steering lock actuator or UPR bracket assembly) and has permitted fuel injection and engine combustion. The engine cannot be started when this item displays "NG".
L Code Check	Verification result between certification ECU (smart key ECU assembly) and steering lock ECU (steering lock actuator or UPR bracket assembly) / OK or NG	OK: Verification result normal NG: Verification result abnormal	When a malfunction is present: The ID code for the certification ECU (smart key ECU assembly) or steering lock ECU (steering lock actuator or UPR bracket assembly) is not registered or the certification ECU (smart key ECU assembly) or steering lock ECU (steering lock actuator or UPR bracket assembly) is malfunctioning. The steering cannot be locked. The steering cannot be unlocked (the engine cannot be started).
Unlock Request Receive	Reception state of steering unlock request signal by certification ECU (smart key ECU assembly) / OK or NG HINT: The reception state is maintained for 10 seconds. When 10 seconds or more have elapsed after receiving the signal, the item changes to "NG".	OK: Within 10 seconds of turning engine switch on (IG) or on (ACC) or starting engine NG: Except above	If the unlock signal has not been received, the engine cannot be started. If this item does not change to "OK" even though the steering unlock conditions are met, the certification ECU (smart key ECU assembly) may be malfunctioning.
Lock Request Receive	Reception state of steering lock request signal by certification ECU (smart key ECU assembly) / OK or NG HINT: The reception state is maintained for 10 seconds. When 10 seconds or more have elapsed after receiving the signal, the item changes to "NG".	OK: Within 10 seconds of opening any door with engine switch off and shift lever in P NG: Except above	If this item does not change to "OK" even though the steering lock conditions are met, the certification ECU (smart key ECU assembly) may be malfunctioning.
L Code Check(Past)	Verification result between certification ECU (smart key ECU assembly) and steering lock ECU (steering lock actuator or UPR bracket assembly) (Past) / OK or NG(Past)	OK: Verification result normal NG(Past): Verification result abnormal (Past)	-
Steering Lock	State of whether steering lock ECU (steering lock actuator or UPR bracket assembly) determined steering is locked / Set or Unset	Set: Steering locked Unset: Steering unlocked	If this item displays "Unset", the steering does not lock.
Steering Unlock	State of whether steering lock ECU (steering lock actuator or UPR bracket assembly) determined steering is unlocked / Set or Unset	Set: Steering unlocked Unset: Steering locked	If this item displays "Unset", the steering does not unlock (engine cannot be started).
Engine Start Indicator	Smart warning light / ON or OFF	Customization status displayed	-
Open in IG2	History of IG2 input of the steering lock ECU (steering lock actuator or UPR bracket assembly) / OK or NG(Past)	OK: History of open in IG2 exists NG(Past): No history of open in IG2 exists	When OK is displayed, the steering lock ECU (steering lock actuator or UPR bracket assembly) has an IG2 input circuit malfunction.

HINT:

Unlock operation conditions for the steering lock:

When the following condition is met, the unlock operation is performed:

The engine switch is on (ACC) or on (IG).

When the engine switch is turned on (ACC) or on (IG) and the key and certification ECU (smart key ECU assembly) are verified, the steering is unlocked.

When any of the following conditions are met, key verification is performed.

The brake pedal is depressed so that the engine can be started.
30 seconds have elapsed after opening and closing a door.
The engine switch is pressed.

Key verification occurs when the code emitted from the key and the code stored in the certification ECU (smart key ECU assembly) are compared to check that they match.

Certification ECU (smart key ECU assembly) verification occurs when the L code is verified while the engine is being started or the engine switch is being pushed. The steering lock ECU (steering lock actuator or UPR bracket assembly) uses the L code to determine whether the certification ECU (smart key ECU assembly) is authorized.

Lock operation conditions for the steering:

When the following conditions are met and the certification ECU (smart key ECU assembly) has been verified, the lock operation is performed.

The engine switch is off.
The shift lever is in P.
A door is opened or a door lock operation (door lock, wireless door lock or key-linked lock) is performed.

HINT:

The following example shows the behavior of various Data List items when the shift lever is in P, the brake pedal is not depressed, the vehicle is normal and the power source mode changes.

HINT:

Get into the vehicle while carrying the key. With the engine switch off, the shift lever in P and all the doors closed, perform the following procedures and check the power source mode.

*1: Without depressing the brake pedal, press the engine switch and check that the power source mode changes to on (ACC).
*2: Without depressing the brake pedal, press the engine switch and check that the power source mode changes to on (IG).
*3: Press the engine switch and check that the power source mode changes to off.
*4: Release the brake pedal, open the driver door and check that the steering locks.

Main Body

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
FL Door Courtesy SW	Front door courtesy light switch assembly LH / ON or OFF	ON: Front door LH open OFF: Front door LH closed	If this item does not change according to the actual state of the driver door, there is a malfunction in the door courtesy light switch or related part.

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

FL Door Courtesy SW

Front door courtesy light switch assembly LH /

ON or OFF

ON: Front door LH open

OFF: Front door LH closed

If this item does not change according to the actual state of the driver door, there is a malfunction in the door courtesy light switch or related part.

2. ACTIVE TEST

HINT:

Using the Techstream to perform Active Tests allows relays, VSVs, actuators and other items to be operated without removing any parts. This non-intrusive functional inspection can be very useful because intermittent operation may be discovered before parts or wiring is disturbed. Performing Active Tests early in troubleshooting is one way to save diagnostic time. Data List information can be displayed while performing Active Tests.

(a) Turn the engine switch off.

(b) Connect the Techstream to the DLC3.

(d) Turn the Techstream on.

(e) Enter the following menus: Body Electrical / Power Source Control / Active Test.

(f) According to the display on the Techstream, perform the Active Test.

Power Source Control

Tester Display	Test Part	Control Range	Diagnostic Note
P Supply for Steering Lock	Certification ECU (smart key ECU assembly)	OFF/ON HINT: OFF: Power is not supplied ON: Power is supplied	When performing this Active Test, make sure the following condition is met: The engine switch is on (IG).

Tester Display

Test Part

Control Range

Diagnostic Note

P Supply for Steering Lock

Certification ECU (smart key ECU assembly)

OFF/ON

HINT:

OFF: Power is not supplied

ON: Power is supplied

When performing this Active Test, make sure the following condition is met:

The engine switch is on (IG).

Terminals Of Ecu

TERMINALS OF ECU 1. TERMINAL INSPECTION Text in Illustration *a Component without harness connected (Steering Lock ECU (Steering Lock Actuator or UPR Bracket Assembly)) ...

Diagnostic Trouble Code Chart

DIAGNOSTIC TROUBLE CODE CHART Steering Lock System DTC Code Detection Item See page B2781 Open / Short in Steering Lock ECU ...

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