Reference Inspection Using Oscilloscope Preparation

a. Remove the translate ECU.

b. Connect the oscilloscope to the terminal VSC+ (4) and GND (14) of the translate ECU harness side connector.

2001 BRAKES ABS With EBD & Trac & VSC System - Diagnostics - Sequoia

Hilux Ecu Oscilloscope
Fig. 89: Checking Translate ECU Communication CHECK:

Start the engine, and check the signal waveform.

OK: Check and replace translate ECU.

NG: GO TO NEXT STEP

2. Check for open and short circuit in harness and connector between EACH OF TERMINALS VSC+ AND VSC- OF TRANSLATE ECU AND SKID CONTROL ECU .

NG: Repair or replace harness or connector.

OK: Check and replace skid control ECU.

DTC 44: NEO SIGNAL

CIRCUIT DESCRIPTION

The translate ECU receives engine revolution speed signals (NEO signal) from the ECM.

2001 BRAKES ABS With EBD & Trac & VSC System - Diagnostics - Sequoia

DTC No

DTC Detecting Condition

Trouble Area

44

1131 voltage is 8.5 V or mare, vehicle speed is 30 km/h 01 more, and open or short condition in circuit for engine speed signal continues for 10 soc. undor normal commu nlcation between engine and skid control ECU

• Translate ECU

Fig. 90: DTC 44 NEO Signal Circuit Description WIRING DIAGRAM

Short Circuit Ecu
Fig. 91: DTC 44 NEO Signal Circuit Diagram

INSPECTION PROCEDURE

1. Check for open and short circuit in harness and connector between TERMINAL NEO OF TRANSLATE ECU AND TERMINAL NEO OF ECM .

NG: Repair or replace harness and connector.

OK: GO TO NEXT STEP

2. Check voltage between terminal NEO (13) of translate ECU and body ground.

PREPARATION:

Remove the translate ECU with connectors still connected. CHECK:

a. Turn the ignition switch ON.

b. Measure the voltage between terminal 13 of the translate ECU and body ground under the engine conditions below.

2001 BRAKES ABS With EBD & Trac & VSC System - Diagnostics - Sequoia

Abs Vsc Trc
Fig. 92: Checking Voltage Between Terminal NEO (13) Of Translate ECU & Body Ground
VOLTAGE CHECK

Engine condition

Voltage

OFF (IG ON)

3 - 6 V or below 1 V

ON (Idling)

3 - 6 V <--> below 1 V (Pulse)

2001 BRAKES ABS With EBD & Trac & VSC System - Diagnostics - Sequoia

Fig. 93: Pulse Formation Diagram

NG: Check and replace ECM. OK: Check and replace translate ECU.

If the same code is still output after the DTC is deleted, check the contact condition of each connection.

DTC 53: ECM COMMUNICATION CIRCUIT MALFUNCTION CIRCUIT DESCRIPTION

The circuit is used to send TRAC & VSC control information from the translate ECU to the ECM (TRC+, TRC-), and engine control information from the ECM to the translate ECU (ENG+, ENG-).

DTC No.

DTC Detecting Condition

Trouble Area

When any of tiie following 1. through 3. is delected at IG1

voltage of 8.5 V or more and engine speed of 500 rpm or

more:

53

1. Signal cannot be received continuously for 5 sec. or more.

2. Condition that signal cannot be received from ECM at least once with in 5 sec. occurs 10 times or more wilhin 60 sec

3. Condition that signal cannot be sent to ECM at least once within 5 sec, occurs 10 times or more within 60

• Translate ECU

G02810MS

G02810MS

Fig. 94: DTC 53 ECM Communication Circuit Malfunction Description WIRING DIAGRAM

2001 BRAKES ABS With EBD & Trac & VSC System - Diagnostics - Sequoia

Abs Wire Oscilloscope
Fig. 95: DTC 53 ECM Communication Circuit Malfunction Wiring Diagram

INSPECTION PROCEDURE

1. Check translate ECU communication.

REFERENCE: INSPECTION USING OSCILLOSCOPE PREPARATION:

a. Remove the translate ECU.

b. Connect the oscilloscope to each of the terminals ENG+ or TRC+ and GND of the translate ECU harness side connector.

2001 BRAKES ABS With EBD & Trac & VSC System - Diagnostics - Sequoia

Oscilloscope Wiring Diagram
Fig. 96: Checking Translate ECU Communication CHECK:

Start the engine, and check the signal waveform.

OK: Check and replace translate ECU.

NG: GO TO NEXT STEP

2. Check for open and short circuit in harness and connector between EACH OF TERMINALS ENG+, ENG-, TRC+ AND TRC- OF TRANSLATE ECU AND ECM .

NG: Repair or replace harness or connector.

OK: Check and replace ECM.

DTC NON CODE: TRANSLATE ECU MALFUNCTION

CIRCUIT DESCRIPTION

2001 BRAKES ABS With EBD & Trac & VSC System - Diagnostics - Sequoia

DTC No.

DTC Detecting Condition

Trouble Area

Non code

Transtate ECU internal malfunction is detected.

• Brake warning light circuit

• Tc terminal circuit

• Translate ECU

G02a10252

G02a10252

Fig. 97: DTC Non Code Translate ECU Malfunction Circuit Description INSPECTION PROCEDURE

1. Check the BRAKE warning light circuit (See BRAKE Warning Light Circuit ).

NG: Repair or replace the BRAKE warning light circuit. OK: GO TO NEXT STEP

2. Check the Tc terminal circuit (See Tc Terminal Circuit ).

NG: Repair or replace the Tc terminal circuit. OK: Check and replace translate ECU.

DTC ALWAYS ON*: MALFUNCTION IN SKID CONTROL ECU

*: ABS warning light CIRCUIT DESCRIPTION

DTC No.

DTC Detecting Condition

Trouble Area

Always ON

When any of the following is detected: T Malfunction in ECU internal circuit is identified. 2. ECU power source voltage is too high.

• Charging system

• Power source circuit

• ABS warning light circuit

• Skid control ECU

GO2S10ÏS3

GO2S10ÏS3

Fig. 98: DTC Always On Malfunction In Skid Control ECU Circuit Description

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