Terminals Of Ecu

Fig 1: Identifying ECU Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

ECU TERMINALS VOLTAGE

Symbols (Terminals No.)

Wiring Color

Terminal Description

Condition

Specified Condition

B - ES (C6-1 - C6-21)

L-Y - BR

Battery (+B circuit)

Always

10 to 14 V

C- ES (C6-2 - C6-21)

Y-B - BR

WATER COOL Indicator Light Signal

COOL indicator light OFF
COOL indicator light ON

Below 1 V
10 to 14 V

H - ES (C6-3 - C6-21)

Y-R - BR

WATER HOT Indicator Light Signal

HOT indicator light OFF
HOT indicator light ON

Below 1 V
10 to 14 V

VSCW - ES (C6-4 - C6-21)

BR-W - BR

VSC Indicator Light Signal

VSC indicator light OFF
VSC indicator light ON

10 to 14 V
Below 1 V

SLIP - ES (C6-5 - C6-21)

B-R - BR

Slip Indicator Light Signal

Slip indicator light OFF
Slip indicator light ON

10 to 14 V
Below 1 V

P - ES (C6-6 - C6-21)

R - BR

A/T P Indicator Light Signal

A/T P indicator light OFF
A/T P indicator light ON

Below 1 V
10 to 14 V

R - ES (C6-7 - C6-21)

R-W - BR

A/T R Indicator Light Signal

A/T R indicator light OFF
A/T R indicator light ON

Below 1 V
10 to 14 V

N - ES (C6-8 - C6-21)

GR- BR

A/T N Indicator Light Signal

A/T N indicator light OFF
A/T N indicator light ON

Below 1 V
10 to 14 V

D - ES (C6-9 - C6-21)

R-Y - BR

A/T D Indicator Light Signal

A/T D indicator light OFF
A/T D indicator light ON

Below 1 V
10 to 14 V

2- ES (C6-10 - C6-21)

G-R - BR

A/T 2 Indicator Light Signal

A/T 2 indicator light OFF
A/T 2 indicator light ON

Below 1 V
10 to 14 V

L- ES (C6-11 - C6-21)

G-W - BR

A/T L Indicator Light Signal

A/T L indicator light OFF
A/T L indicator light ON

Below 1 V
10 to 14 V

OFF - ES (C6-12 - C6-21)

G-O - BR

O/D OFF Indicator Light Signal

O/D OFF indicator light OFF
O/D OFF indicator light ON

10 to 14 V
Below 1 V

B- ES (C6-13 - C6-21)

G-B - BR

Left Turn Indicator Light Signal

Left turn indicator light OFF
Left turn indicator light ON

Below 1 V
10 to 14 V

- - ES (C6-14 - C6-21)

B-Y - BR

Hi Beam Indicator Light Signal

Hi beam indicator light OFF
Hi beam indicator light ON

10 to 14 V
Below 1 V

SW2 - ES (C6-15 - C6-21)

R-W - BR

DOOR Indicator Light Signal (Except Front LH Door)

DOOR indicator light OFF
DOOR indicator light ON

Below 1 V
10 to 14 V

CHG- - ES (C6-16 - C6-21)

Y - BR

CHARGE Indicator Light Signal

CHARGE indicator light OFF
CHARGE indicator light ON

10 to 14 V
Below 1 V

S - ES (C6-17 - C6-21)

G - BR

Oil Pressure Indicator Light Signal

Oil pressure indicator light OFF
Oil pressure indicator light ON

10 to 14 V
Below 1 V

B - ES (C6-18 - C6-21)

G-Y - BR

Right Turn Indicator Light Signal

Right turn indicator light OFF
Right turn indicator light ON

Below 1 V
10 to 14 V

TROP - ES (C6-19 - C6-21)

R-Y - BR

TRAC OFF Indicator Light Signal

TRAC OFF indicator light OFF
TRAC OFF indicator light ON

10 to 14 V
Below 1 V

EFI - ES (C6-20 - C6-21)

Y-G - BR

CHECK E/G Indicator Light Signal

CHECK E/G indicator light OFF
CHECK E/G indicator light ON

10 to 14 V
Below 1 V

ES - Body ground (C6-21 - Body ground)

BR - -

Body Ground

Always

Below 1 V

IG+ - ES (C6-23 - C6-21)

R-B - BR

IG1 Signal

Ignition switch OFF
Ignition switch ON

Below 1 V
10 to 14 V

SW - ES (C6-24 - C6-21)

R - BR

DOOR Indicator Light Signal (Front LH Door)

DOOR indicator light OFF
DOOR indicator light ON

Below 1 V
10 to 14 V

KSW - ES (C6-25 - C6-21)

Y- BR

Ignition Key Condition

Ignition key is inserted
Ignition key is not inserted

Below 1 V
10 to 14 V

ILL+ - ES (C6-26 - C6-21)

G - BR

Illumination Signal

Light control switch OFF
Light control switch TAIL or HEAD

Below 1 V
10 to 14 V

ILL- - ES (C6-27 - C6-21)

W-G - BR

Light Control Rheostat Signal

Light control rheostat switch Minimum
Light control rheostat switch Maximum

1.2 to 2 V
10 to 14 V

SI - ES (C6-28 - C6-21)

W-R - BR

Speed Signal Input

Ignition switch OFF
Ignition switch ON and slowly turn drive wheel

Below 1 V
Pulse generation (⁽¹⁾)

+S - ES (C6-29 - C6-21)

V-W - BR

Speed Signal Output

Ignition switch OFF
Ignition switch ON and slowly turn drive wheel

Pulse generation (⁽¹⁾)
Pulse generation (⁽¹⁾)

S - ES (C6-30 - C6-21)

B - BR

Tachometer Signal Input

Ignition switch OFF
Engine running

Below 1 V
Pulse generation (⁽²⁾)

L - ES (C6-31 - C6-21)

V - BR

Fuel Sender Gauge Signal

Fuel Level Full
Fuel Level Empty

Below 1 V
4 to 7 V

L - ES (C6-32 - C6-21)

W-R - BR

Driver Side Seat Belt Signal

Ignition switch ON and Driver Side Seat Belt unfastened
Ignition switch ON and Driver Side Seat Belt fastened

10 to 14 V
Below 1 V

SW - ES (C6-33 - C6-21)

O - BR

Front Passenger Side Seat Belt Signal

Ignition switch ON and Front Passenger Side Seat Belt unfastened
Ignition switch ON and Front Passenger Side Seat Belt fastened

10 to 14 V
Below 1 V

SW - ES (C6-34 - C6-21)

B-Y - BR

SRS Indicator Light Signal

SRS indicator light OFF
SRS indicator light ON

Below 1 V
10 to 14 V

LAPL - ES (C6-35 - C6-21)

G-W - BR

Passenger Seat Belt Warning Light Signal

Passenger Seat Belt Warning Light OFF
Passenger Seat Belt Warning Light ON

Below 1 V
10 to 14 V

B - ES (C6-36 - C6-21)

B - BR

Brake Fluid Level Warning Switch Signal

BRAKE indicator light OFF
BRAKE indicator light ON

10 to 14 V
Below 1 V

LP - ES (C6-37 - C6-21)

P - BR

ABS Indicator Light Signal

ABS indicator light OFF
ABS indicator light ON

Below 1 V
10 to 14 V

SW - ES (C6-38 - C6-21)

B-W - BR

BRAKE Indicator Light Signal

BRAKE indicator light OFF
BRAKE indicator light ON

Below 1 V
10 to 14 V

B - ES (C6-40 - C6-21)

B-R - BR

IG2 Signal

Ignition switch OFF
Ignition switch ON

Below 1 V
10 to 14 V

⁽¹⁾	Reference: Using oscilloscope:

⁽²⁾	Reference: Using oscilloscope:

Fig 2: Identifying Voltage Graph

TOOL SETTING AND VEHICLE SPEED

Item	Contents
Tool setting	5 V/ DIV, 20 ms/ DV
Vehicle condition	Driving at approx. 20 km/h (12 mph)

Fig 3: Identifying Waveform

TOOL SETTING AND VEHICLE SPEED

Item	Contents
Tool setting	5 V/ DIV, 10 ms/ DV
Vehicle condition	Engine idle speed