Toyota Tacoma manuals

Toyota Tacoma 2015-2018 Service Manual: Terminals Of Ecu

TERMINALS OF ECU

1. CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

(a) Disconnect the C27 and C29 certification ECU (smart key ECU assembly) connectors.

(a) Disconnect the C27 and C29 certification ECU (smart key ECU assembly) connectors.

(b) Measure the voltage and resistance according to the value(s) in the table below.

HINT:

Measure the values on the wire harness side with the connector disconnected.

Tester Connection

Input/ Output

Wiring Color

Terminal Description

Condition

Specified Condition

Related Data List Item

C27-12 (STA) - C29-11 (E)

Input

Y - W-B

When starting the engine, this monitors the voltage sent from terminal STAR to the starter relay to judge whether the engine is "being started".

20°C (68°F)

106.78 to 115.98 Ω

-

C27-10 (STAR) - Body ground

Input/ Output

V - Body ground

Outputs voltage to the starter relay

  • Outputs voltage (12 V) to the starter relay when starting the engine. (Max. 30 sec. Turns off when an engine speed of 500 rpm or more continues for 500 ms or more.)

HINT:

When Hi is selected, a start request signal (STAR) will not be output even though a start request signal (STSW) is input.

Shift lever in any position other than P or N → Shift lever in P or N (at 20°C (68°F))

10 kΩ or higher → 107.05 to 116.33 Ω

-

Receives neutral start switch (P, N position detection) signal

  • Monitors whether the neutral start switch is on (P or N) or off (other than P or N). Applies voltage via a resistor (large) in the certification ECU (smart key ECU assembly). When the neutral start switch is on, due to the starter relay coil resistance (small) using some of the voltage, the voltage at terminal STAR will be low (2.7 V or less), and when the neutral start switch is off, the voltage will be high (9 V or more).

Perform the following operations except while the engine is cranking:

  • Shift lever in any position other than P or N → Shift lever in P or N (at 20°C (68°F))

30 kΩ or higher → 107.05 to 116.33 Ω

Neutral SW/ Clutch SW

C27-14 (NE) - Body ground

Input

BE - Body ground

Engine speed signal

Always

10 kΩ or higher

Engine Conditio n

C27-2 (STP1) - Body ground

Input

L - Body ground

Stop light switch signal

Brake pedal depressed → Brake pedal released

9 V or higher → 1 V or less

Stop Light Switch1

C29-10 (+B) - C29-11 (E)

Input

P - W-B

Power source

Always

11 to 14 V

-

C29-23 (SLP) - C29-11 (E)

Input

BE - W-B

Steering lock position signal

Steering locked

10 kΩ or higher

Steering Unlock Switch

C29-22 (P) - C29-11 (E)

Input

V - W-B

P position signal

Shift lever in P → Shift lever not in P

30 kΩ or higher → Below 200 Ω

Shift P Signal

C29-11 (E) - Body ground

-

W-B - Body ground

GND

Always

Below 1 Ω

-

C29-18 (SSW2) - Body ground

Input

GR - Body ground

SSW2 contact signal

HINT:

Backup for SSW1. Behaves the same way as SSW1.

Engine switch pushed → Engine switch not pushed

Below 15 Ω → 10 kΩ or higher

Start Switch2

C29-16 (SSW1) - Body ground

Input

BE - Body ground

SSW1 contact signal

Engine switch pushed → Engine switch not pushed

Below 15 Ω → 10 kΩ or higher

Start Switch1

C29-9 (ACCD) - Body ground

Output

R - Body ground

ACC signal

20°C (68°F)

130.92 to 190.74 Ω

ACC Relay Monitor

C27-3 (IG1D) - Body ground

Output

B - Body ground

IG signal

20°C (68°F)

87.32 to 127.14 Ω

IG Relay Monitor (Outside )

C27-4 (CUTB) - C29-11 (E)

Input

GR - W-B

Dark current cut pin*1

Always

11 to 14 V

-

C29-5 (SPD) - Body ground

Input

V - Body ground

Vehicle speed signal

Always

30 kΩ or higher

Vehicle Speed Signal

  • *1: In order to prevent the vehicle battery from being depleted when the vehicle is shipped long distances, a fuse that cuts unnecessary electrical load while the vehicle is being shipped is set in the circuit. If the fuse is removed, the circuit becomes open. If the fuse that is between the vehicle battery and terminal CUTB is removed and the circuit is open, the certification ECU (smart key ECU assembly) changes to a certain control mode (example: the transmission of electric waves every 0.25 seconds that form the detection area stops).

(c) Reconnect the C27 and C29 certification ECU (smart key ECU assembly) connectors.

(d) Measure the voltage and check for pulses according to the value(s) in the table below.

Tester Connection

Input/ Output

Wiring Color

Terminal Description

Condition

Specified Condition

Related Data List Item

C27-12 (STA) - C29-11 (E)

Input

Y - W-B

When starting the engine, this monitors the voltage sent from terminal STAR to the starter relay to judge whether the engine is "being started".

With the brake pedal depressed, the engine switch is pressed and held (starter on) → After approximately 1 second has elapsed, the engine switch is released (starter off)

6 V or higher*1 → 1.0 V or less

-

C27-10 (STAR) - C29-11 (E)

Input/ Output

V - W-B

Outputs voltage to the starter relay

  • Outputs voltage (12 V) to the starter relay when starting the engine. (Max. 30 seconds Turns off when an engine speed of 500 rpm or more continues for 500 ms or more.)

HINT:

When Hi is selected, a start request signal (STAR) will not be output even though a start request signal (STSW) is input.

With the brake pedal depressed, the engine switch is pressed and held → After approximately 1 second has elapsed, the engine switch is released

6 V or higher*1 → 1.0 V or less

-

Receives neutral start switch (P, N position detection) signal

  • Monitors whether the neutral start switch is on (P or N) or off (other than P or N). Applies voltage via a resistor (large) in the certification ECU (smart key ECU assembly). When the neutral start switch is on, due to the starter relay coil resistance (small) using some of the voltage, the voltage at terminal STAR will be low (2.7 V or less), and when the neutral start switch is off, the voltage will be high (9 V or more).

Perform the following operations except while the engine is cranking:

  • Shift lever in any position other than P or N → Shift lever in P or N (at 20°C (68°F))

9 V or higher → 2.7 V or less

Neutral SW/ Clutch SW

C27-14 (NE) - C29-11 (E)

Input

BE - W-B

Engine speed signal

Idling (engine warmed up)

Pulse generation (See waveform 1)

Engine Conditio n

C27-2 (STP1) - C29-11 (E)

Input

L - W-B

Stop light switch signal

Brake pedal depressed → Brake pedal released

1 V or less → 9 V or higher

Stop Light Switch1

C29-23 (SLP) - C29-11 (E)

Input

BE - W-B

Steering lock position signal

Steering locked → Steering unlocked

11 to 14 V → 1.5 V or less

Steering Unlock Switch

C29-24 (SLR+) - C29-11 (E)

Output

Y - W-B

Steering lock motor operation command signal (Steering lock motor operation permission signal sent from the certification ECU (smart key ECU assembly))

When a door is opened, the steering lock motor will be operated if all of the following conditions are met:

  • The steering is unlocked.
  • The engine switch is off.
  • The shift lever is in P.

Pulse generation (See waveform 2)

-

C29-22 (P) - C29-11 (E)

Input

V - W-B

P position signal

Shift lever in P → Shift lever not in P

9 V or higher → 2.76 V or less

Shift P Signal

C29-18 (SSW2) - C29-11 (E)

Input

GR - W-B

SSW2 contact signal

HINT:

Backup for SSW1. Behaves the same way as SSW1.

Engine switch not pushed → Engine switch pushed

9 V or higher → 1 V or less

Start Switch2

C29-16 (SSW1) - C29-11 (E)

Input

BE - W-B

SSW1 contact signal

Engine switch not pushed → Engine switch pushed

9 V or higher → 1 V or less

Start Switch1

C29-9 (ACCD) - C29-11 (E)

Output

R - W-B

ACC signal

Engine switch off → Engine switch on (ACC)

1 V or less → 8.5 V or higher

ACC Relay Monitor

C27-3 (IG1D) - C29-11 (E)

Output

B - W-B

IG signal

Engine switch on (ACC) → Engine switch on (IG)

1 V or less → 9 V or higher

IG Relay Monitor (Outside )

C29-5 (SPD) - C29-11 (E)

Input

V - W-B

Vehicle speed signal

Vehicle being driven at approximately 5 km/h (3 mph)

Pulse generation (See waveform 3)

ACC Relay Monitor

  • *1: While the engine is cranking, the battery voltage may drop to approximately 6 V.

HINT:

  • The waveform of the steering lock actuator motor stopped can be checked without performing any particular operation.
  • The waveform of the steering lock actuator motor operating can be checked if either of the following operations is performed:
    • To unlock the steering, bring the electrical key transmitter sub-assembly into the cabin and turn the engine switch on (ACC) or on (IG).
    • To lock the steering, open a door with the engine switch off and the shift lever in P.

(e) Using an oscilloscope, check the waveform of the ECU.

NOTICE:

The oscilloscope waveform shown in the illustration is an example for reference only. Noise, chattering, etc. are not shown.

(1) Waveform 1

Item

Content

Tester Connection

C27-14 (NE) - C29-11 (E)

Tool Setting

2 V/DIV., 2 ms./DIV.

Condition

Idling (engine warmed up)

HINT:

The wavelength becomes shorter as the engine speed increases.

(2) Waveform 2

Item

Content

Tester Connection

C29-24 (SLR+) - C29-11 (E)

Tool Setting

2 V/DIV., 200 ms./DIV.

Condition

Steering lock motor stopped → Steering lock motor operating → Steering lock motor stopped

Text in Illustration

*a

Steering lock motor not operating

*b

Steering lock motor operating

(3) Waveform 3

Item

Content

Tester Connection

C29-5 (SPD) - C29-11 (E)

Tool Setting

5 V/DIV., 200 ms./DIV.

Condition

Vehicle being driven at approx. 5 km/h (3 mph)

HINT:

The wavelength becomes shorter as the engine speed increases.

2. CHECK STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPR BRACKET ASSEMBLY)

See page 3. CHECK ENGINE SWITCH

3. CHECK ENGINE SWITCH

See page Data List / Active Test

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