Terminals Of Ecu

WARNING: This page is about a different car, the 2006 Lexus IS 350. However, it is still accessible from the selected car via links, so may be relevant.

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

SKID CONTROL ECU INSPECTION

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

Using an oscilloscope, check that the pulse generates between each terminal or between each terminal and the 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 NO AND SPECIFIED CONDITION CHART

Symbols (Terminal No.)

Wiring Color

Terminal Description

Condition

Specified Condition

SFRR (A35-1) - Body ground

GR - Body ground

Front decrease solenoid RH output

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

10 to 14 V

SRLR (A35-2) - Body ground

R - Body ground

Rear decrease solenoid LH output

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

10 to 14 V

MR (A35-3) - Body ground

L-B - Body ground

Motor relay output

Engine switch on (IG)

10 to 14 V

FLO (A35-4) - Body ground (⁽¹⁾)

R-L - Body ground

Front wheel speed signal LH output

During the drive

Pulse generation (see WAVEFORM 1 )

FRO (A35-5) - Body ground (⁽¹⁾)

G-W - Body ground

Front wheel speed signal RH output

During the drive

Pulse generation (see WAVEFORM 1 )

FR- (A35-7) - Body ground

G - Body ground

Front wheel speed sensor RH input

Vehicle speed (forward or back) input

Pulse generation (see WAVEFORM 2 )

FR+ (A35-8) - Body ground

L - Body ground

Front wheel speed sensor power supply

RH output Engine switch on (IG)

10 to 14 V

FL+ (A35-9) - Body ground

P - Body ground

Front wheel speed sensor power supply

LH output Engine switch on (IG)

10 to 14 V

FL- (A35-10) - Body ground

L - Body ground

Front wheel speed sensor LH input

Vehicle speed (forward or back) input

Pulse generation (see WAVEFORM 2 )

R+ (A35-11) - Body ground

G - Body ground

Solenoid relay power supply

Engine switch on (IG)

10 to 14 V

SRRR (A35-12) - Body ground

W-L - Body ground

Rear decrease solenoid RH output

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

10 to 14 V

SFLR (A35-13) - Body ground

W - Body ground

Front decrease solenoid RH output

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

10 to 14 V

SSEL (A54-14) - Body ground

Y-B - 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

SEL2 (A35-16) - Body ground

B-L - 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

FSW+ (A35-18) - Body ground

G-B - Body ground

Brake pedal load sensing switch input

Stop light switch ON --> OFF (Brake pedal depressed --> released)

Approx. 1 kΩ --> Approx. 213 Ω

STP2 (A35-20) - Body ground

R-B - Body ground

Stop light control relay input

Stop light switch ON --> OFF (Brake pedal depressed --> released)

10 to 14 V --> Below 1.5 V

STPO (A35-21) - Body ground

L - Body ground

Stop light control relay output

Engine switch on (IG)

10 to 14 V

GND3 (A35-22) - Body ground

W-B - Body ground

Skid control ECU ground 3

Always

Below 1 Ω

IG1 (J77-1) - Body ground

B - Body ground

IG1 power supply

Engine switch on (IG)

10 to 14 V

RL- (J77-3) - Body ground

B - Body ground

Rear wheel speed sensor LH input

Vehicle speed (forward or back) input

Pulse generation (see WAVEFORM 2 )

RL+ (J77-4) - Body ground

LG - Body ground

Rear wheel speed sensor power supply LH output

Engine switch on (IG)

10 to 14 V

RR+ (J77-5) - Body ground

B - Body ground

Rear wheel speed sensor power supply RH output

Engine switch on (IG)

10 to 14 V

RR- (J77-6) - Body ground

G - Body ground

Rear wheel speed sensor RH input

Vehicle speed (forward or back) input

Pulse generation (see WAVEFORM 2 )

CSW (J77-7) - Body ground

P - Body ground

Traction OFF switch input

Traction OFF switch ON --> OFF

Below 1 Ω --> 10 kΩ or higher

CANH (J77-8) - Body ground

R - Body ground

CAN communication line H

Engine switch off

54 to 67 Ω

SP1 (J77-9) - Body ground

V - Body ground

Speed signal output for combination meter

During the drive

Pulse generation (see WAVEFORM 3 )

STP1 (J77-10) - Body ground

R - Body ground

Stop light switch input

Stop light switch ON --> OFF (Brake pedal depressed --> released)

10 to 14 V --> Below 1.5 V

BZ (J77-11) - Body ground

L - Body ground

Skid control buzzer output

Engine switch on (IG), buzzer sound --> not sound

Below 1 V --> 10 to 14 V

D/G (J77-12) - Body ground

R - Body ground

Diagnosis tester communication line

Engine switch on (IG)

10 to 14 V

TS (J77-13) - Body ground

SB - Body ground

Sensor check activation input

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

Below 1.5 V --> 10 to 14 V

PKB (J77-14) - Body ground

R-B - Body ground

Parking brake switch input

Engine switch on (IG), parking brake switch ON --> OFF

Below 1 Ω --> 10 kΩ or higher

WFSE (J77-15) - Body ground

GR - Body ground

ECU program rewrite input

CANL (J77-16) - Body ground

W - Body ground

CAN communication line L

Engine switch off

54 to 67 Ω

MRF (J78-1) - Body ground

L-B - Body ground

Fail safe motor relay output

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

Below 1 V

SR (J78-2) - Body ground

V - Body ground

Solenoid relay output

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

Below 1 V

PMC (J78-4) - Body ground

R - Body ground

Master cylinder pressure sensor input

Engine switch on (IG), brake pedal released

0.3 to 0.8 V

E2 (J78-6) - Body ground

W - Body ground

Master cylinder pressure sensor ground

Always

Below 1 Ω

RRA+ (J78-7) - Body ground

L - Body ground

Rear holding solenoid (+) RH output

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

10 to 14 V

FLA- (J78-8) - Body ground

W - Body ground

Front holding solenoid (-) LH output

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

10 to 14 V

RLA+ (J78-9) - Body ground

G - Body ground

Rear holding solenoid (+) LH output

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

10 to 14 V

FRA- (J78-10) - Body ground

GR - Body ground

Front holding solenoid (-) RH output

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

10 to 14 V

SM2+ (J78-11) - Body ground

B - Body ground

Master cut linear solenoid 2 (+) output

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

Below 1 V

SM1- (J78-12) - Body ground

R - Body ground

Master cut linear solenoid 1 (-) output

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

Below 1 V

AST (J78-13) - Body ground

Y - Body ground

Linear solenoid power supply

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

10 to 14 V

GND2 (J78-14) - Body ground

W-B - Body ground

Skid control ECU ground 2

Always

Below 1 Ω

MT (J78-15) - Body ground

GR - Body ground

Motor relay test input

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

Below 1 V

VCM (J78-18) - Body ground

B - Body ground

Master cylinder pressure sensor power supply output

Engine switch on (IG)

4.5 to 5.5 V

FSS (J78-19) - Body ground

Master cylinder pressure sensor shielded ground

Always

Below 1 Ω

RRA- (J78-20) - Body ground

O - Body ground

Rear holding solenoid (-) RH output

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

10 to 14 V

FLA+ (J78-21) - Body ground

V - Body ground

Front holding solenoid (+) LH output

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

10 to 14 V

RLA- (J78-22) - Body ground

P - Body ground

Rear holding solenoid (-) LH output

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

10 to 14 V

FRA+ (J78-23) - Body ground

LG - Body ground

Front holding solenoid (+) RH output

Approx. 1.5 seconds after turning engine switch on (IG

10 to 14 V

SM2- (J78-24) - Body ground

BR - Body ground

Master cut linear solenoid 2 (-) output

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

Below 1 V

SM1+ (J78-25) - Body ground

SB - Body ground

Master cut linear solenoid 1 (+) output

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

Below 1 V

GND1 (J78-26) - Body ground

W-B - Body ground

Skid control ECU ground 1

Always

Below 1 Ω

⁽¹⁾

AFS

Waveform 1 (Reference): Using an oscilloscope:

ITEM CONDITION CHART

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

Fig 2: Identifying Reference Waveform 1

HINT:

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

Waveform 2 (Reference): Using an oscilloscope:

ITEM CONDITION CHART

Item	Condition
Tool setting	0.5 V/DIV., 2 ms./DIV.
Vehicle condition	Forward or back

Fig 3: Identifying Reference Waveform 2

HINT:

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

Waveform 3 (Reference): Using an oscilloscope:

ITEM CONDITION CHART

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

Fig 4: Identifying Reference Waveform 3

HINT:

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