Terminals Of Ecu

CHECK BATTERY VOLTAGE
1. Check the battery voltage.
  Standard voltage:
  
  11 to 14 V

SKID CONTROL ECU INSPECTION

Measure the voltage between each terminal or between each terminal and the body ground.
Connect the Techstream to the DLC3, and check the communication condition with the skid control ECU.

Using an oscilloscope, check the pulse generated between each terminal or between each terminal and body ground.

NOTE: Inspection should be performed from the back of the connector with the connector connected to the skid control ECU.

Fig 1: Identifying Skid Control ECU Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

HINT:

Inspect the ECU from the wire harness side while the connector is connected.

TERMINAL DESCRIPTION AND SPECIFIED CONDITION

Terminal No. (Symbols)

Wiring Color

Terminal Description

Condition

Specified Condition

A58-1 (SFRR) - Body ground

G - Body ground

Front decrease solenoid RH output

Apprax. 1.5 seconds after turning engine switch on (IG)

11 to 14 V

A58-2 (SRLR) - Body ground

L - Body ground

Rear decrease solenoid LH output

Approx. 1.5 seconds after turning engine switch on (IG)

11 to 14 V

A58-3 (MR) - Body ground

L-W - Body ground

ABS motor relay output

Engine switch on (IG)

11 to 14 V

A58-4 (FLO) - Body ground⁽¹⁾, ⁽²⁾

R-L - Body ground

Front wheel speed signal LH output

While driving

Pulse generation (see dwaveform 1)

A58-5 (FRO) - Body ground⁽¹⁾, ⁽²⁾

G-W - Body ground

Front wheel speed signal RH output

While driving

Pulse generation (see dwaveform 1)

A58-6 (RRO) - Body ground⁽²⁾

P - Body ground

Rear wheel speed signal RH output

While driving

Pulse generation (see dwaveform 1)

A58-7 (FR-) - Body ground

V-Body ground

Front wheel speed sensor RH input

Vehicle speed (forward or backward) input

Pulse generation (see ewaveform 2)

A58-8 (FR+) - Body ground

P - Body ground

Front wheel speed sensor power supply RH output

Engine switch on (IG)

11 to 14 V

A58-9 (FL+) - Body ground

B - Body ground

Front wheel speed sensor power supply LH output

Engine switch on (IG)

11 to 14 V

A58-10 (FL-) - Body ground

Y - Body ground

Front wheel speed sensor LH input

Vehicle speed (forward or backward) input

Pulse generation (see ewaveform 2)

A58-11 (R+) - Body ground

G-R - Body ground

ABS solenoid relay power supply

Engine switch on (IG)

11 to 14 V

A58-12 (SRRR) - Body ground

BR - Body ground

Rear decrease solenoid RH output

Approx. 1.5 seconds after turning engine switch on (IG)

11 to 14 V

A58-13(SFLR) - Body ground

Y - Body ground

Front decrease solenoid RH output

Approx. 1.5 seconds after turning engine switch on (IG)

11 to 14 V

A58-14 (SSEL) - Body ground

GR - Body ground

Solenoid characteristic identification input 1

Engine start

Low: 0 V (Normal)
Middle: 3.7 to 8.26 V
High: 7.8 to 14 V

A58-15 (RLO) - Body ground⁽²⁾

L - Body ground

Rear wheel speed signal LH output

While driving

Pulse generation (see dwaveform 1)

A58-16 (SEL2) - Body ground

R - Body ground

Solenoid characteristic identification input 2

Engine start

Low: 0 V (Normal)
Middle: 3.7 to 8.26 V
High: 7.8 to 14 V

A58-18 (FSW+) - Body ground

G-R - Body ground

Brake pedal load sensing switch input

Stop light switch OFF → ON (Brake pedal depressed → released)

950 to 1050 Ω → 203 to 223 Ω

A58-22 (GND3) - Body ground

W-B - Body ground

Skid control ECU ground 3

Always

Below 1 Ω

K93-1 (IG1) - Body ground

O - Body ground

IG1 power supply

Engine switch on (IG)

11 to 14 V

K93-3 (RL-) - Body ground

Y - Body ground

Rear wheel speed sensor LH input

Vehicle speed (forward or backward) input

Pulse generation (see ewaveform 2)

K93-4 (RL+) - Body ground

L - Body ground

Rear wheel speed sensor power supply LH output

Engine switch on (IG)

11 to 14 V

K93-5 (RR+) - Body ground

R - Body ground

Rear wheel speed sensor power supply RH output

Engine switch on (IG)

11 to 14 V

K93-6 (RR-) - Body ground

G - Body ground

Rear wheel speed sensor RH input

Vehicle speed (forward or backward) input

Pulse generation (see ewaveform 2)

K93-7 (CSW) - Body ground

V - Body ground

VSC OFF switch input

VSC OFF switch ON → OFF

Below 1Ω → 10 kΩ or higher

K93-8 (CANH) - Body ground

BR - Body ground

CAN communication line H

Engine switch off

54 to 67 Ω

K93-9 (SP1) - Body ground

V - Body ground

Speed signal output for combination meter

While driving

Pulse generation (see fwaveform 3)

K93-10 (STP) - Body ground

R - Body ground

Stop light switch input

Stop light switch ON → OFF (Brake pedal depressed → released)

11 to 14 V → Below 1.5 V

K93-11 (BZ) - Body ground

Y - Body ground

Skid control buzzer output

Engine switch on (IG), buzzer sound → not sound

Below 1 V → 11 to 14 V

K93-12 (D/G) - Body ground

SB - Body ground

Diagnosis tester communication line

Engine switch on (IG)

11 to 14 V

K93-13 (TS) - Body ground

Y - Body ground

Sensor check activation input

Engine switch on (IG), terminals TS and CG of DLC3 connect → disconnect

Below 1.5 V → 11 to 14 V

K93-14 (PKB) - Body ground

Y - Body ground

Parking brake switch input

Engine switch on (IG), parking brake switch ON → OFF

Below 1 Ω → 10 kΩ or higher

K93-15 (WFSE) - Body ground

P - Body ground

ECU program rewrite input

K93-16 (CANL) - Body ground

Y - Body ground

CAN communication line L

Engine switch off

54 to 67 Ω

A57-1 (MRF) - Body ground

LG-B - Body ground

ABS motor fail safe relay output

Approx. 1.5 seconds after turning engine switch on (IG)

Below 1 V

A57-2 (SR) - Body ground

R-Y - Body ground

ABS solenoid relay output

Approx. 1.5 seconds after turning engine switch on (IG)

Below 1 V

A57-4 (PMC) - Body ground

W - Body ground

Master cylinder pressure sensor input

Engine switch on (IG), brake pedal released

0.3 to 0.8 V

A57-6 (E2) - Body ground

R - Body ground

Master cylinder pressure sensor ground

Always

Below 1 Ω

A57-7 (RRA+) - Body ground

L-Y - Body ground

Rear holding solenoid (+) RH output

Approx. 1.5 seconds after turning engine switch on (IG)

11 to 14 V

A57-8 (FLA-) - Body ground

P-L - Body ground

Front holding solenoid (-) LH output

Approx. 1.5 seconds after turning engine switch on (IG)

11 to 14 V

A57-9 (RLA+) - Body ground

L-R - Body ground

Rear holding solenoid (+) LH output

Approx. 1.5 seconds after turning engine switch on (IG)

11 to 14 V

A57-10 (FRA-) - Body ground

P - Body ground

Front holding solenoid (-) RH output

Approx. 1.5 seconds after turning engine switch on (IG)

11 to 14 V

A57-11 (SM2+) - Body ground

R-B - Body ground

Master cut linear solenoid 2 (+) output

Approx. 1.5 seconds after turning engine switch on (IG)

Below 1 V

A57-12 (SM1-) - Body ground

G-B - Body ground

Master cut linear solenoid 1 (-) output

Approx. 1.5 seconds after turning engine switch on (IG)

Below 1 V

A57-13 (AST) - Body ground

Y - Body ground

Linear solenoid power supply

Approx. 1.5 seconds after turning engine switch on (IG)

11 to 14 V

A57-14 (GND2) - Body ground

W-B - Body ground

Skid control ECU ground 2

Always

Below 1 Ω

A57-15 (MT) - Body ground

W-R - Body ground

ABS motor relay test input

Approx. 1.5 seconds after turning engine switch on (IG)

Below 1 V

A57-18 (VCM) - Body ground

B - Body ground

Master cylinder pressure sensor power supply output

Engine switch on (IG)

4.5 to 5.5 V

A57-19 (FSS) - Body ground

Shielded - Body ground

Master cylinder pressure sensor shielded ground

Always

Below 1 Ω

A57-20 (RRA-) - Body ground

Y-G - Body ground

Rear holding solenoid (-) RH output

Approx. 1.5 seconds after turning engine switch on (IG)

11 to 14 V

A57-21 (FLA+) - Body ground

V - Body ground

Front holding solenoid (+) LH output

Approx. 1.5 seconds after turning engine switch on (IG)

11 to 14 V

A57-22 (RLA-) - Body ground

L-W - Body ground

Rear holding solenoid (-) LH output

Approx. 1.5 seconds after turning engine switch on (IG)

11 to 14 V

A57-23 (FRA+) - Body ground

LG - Body ground

Front holding solenoid (+) RH output

Approx. 1.5 seconds after turning engine switch on (IG)

11 to 14 V

A57-24 (SM2-) - Body ground

LG-B - Body ground

Master cut linear solenoid 2 (-) output

Approx. 1.5 seconds after turning engine switch on (IG)

Below 1 V

A57-25 (SM1+) - Body ground

G-W - Body ground

Master cut linear solenoid 1 (+) output

Approx. 1.5 seconds after turning engine switch on (IG)

Below 1 V

A57-26 (GND1) - Body ground

W-B - Body ground

Skid control ECU ground 1

Always

Below 1 Ω

⁽¹⁾	for headlight beam level control or AFS

⁽²⁾

for 4WD

Waveform 1 (Reference): Using an oscilloscope:

WAVEFORM REFERENCE CHART

Item	Condition
Tool setting	5 V/DIV., 5 ms./DIV.
Vehicle condition	While driving at approximately 20 km/h (12 mph)

HINT:

As the vehicle speed (wheel speed) becomes faster, the cycle becomes shorter.

Fig 2: Waveform 1 Graph

Waveform 2 (Reference): Using an oscilloscope:

WAVEFORM REFERENCE CHART

Item	Condition
Tool setting	0.5 V/DIV., 2 ms./DIV.
Vehicle condition	Moving forward or backward

HINT:

As the vehicle speed (wheel speed) becomes faster, the cycle becomes shorter.

Fig 3: Waveform 2 Graph

Waveform 3 (Reference): Using an oscilloscope:

WAVEFORM REFERENCE CHART

Item	Condition
Tool setting	5 V/DIV., 50 ms./DIV.
Vehicle condition	While driving at approximately 20 km/h (12 mph)

HINT:

As the vehicle speed (wheel speed) becomes faster, the cycle becomes shorter.

Fig 4: Waveform 3 Graph