Inspection Procedure

NOTE: When replacing the skid control ECU, perform initialization of linear solenoid valve and calibration (see INITIALIZATION ).

PERFORM ACTIVE TEST USING TECHSTREAM (ABS MAIN RELAY)

Connect the Techstream to the DLC3.
Turn the engine switch on (IG).

Select the Active Test mode on the Techstream.

ABS/VSC/TRAC:

TESTER DISPLAY REFERENCE CHART

Tester Display

Test Part

Control Range

Diagnostic Note

ECB⁽¹⁾ Main Relay

ABS main relay

Relay ON/OFF

Operation of relay (clicking sound) can be heard

ECB⁽¹⁾ Main Relay 2

ABS main relay 2

Relay ON/OFF

Operation of relay (clicking sound) can be heard

⁽¹⁾	Electronically Controlled Brake

Check the operation sound of the ABS main relay when operating it with the Techstream.
OK:

The operation sound of the ABS main relay is heard.

NG : Go to step 5

OK : Go to Next Step

INSPECT FUSE (ABS1 AND ABS MAIN FUSES)
1. Remove the ABS1, ABS MAIN2 and ABS MAIN3 fuses from the engine room R/B (J/B) No.1.
2. Check the ABS1, ABS MAIN2 and ABS MAIN3 fuses.
  Resistance:
  
  Below 1 Ω (Continuity)
NG : REPLACE FUSE (ABS1 OR ABS MAIN FUSE)

OK : Go to Next Step

INSPECT ABS MAIN RELAY

Remove the ABS MAIN1 relay and ABS MAIN2 relay.

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

Resistance

RESISTANCE REFERENCE CHART

Tester Connection	Condition	Specified Condition
3-5	Always	10 kΩ or higher (No continuity)
3-5	Apply B+ between terminal 1 and 2	Below 1 Ω (Continuity)

NG : REPLACE ABS MAIN RELAY

Fig 1: Inspecting ABS Main Relay

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK : Go to Next Step

INSPECT SKID CONTROL ECU (Dl TERMINAL)

Disconnect the skid control ECU (A13, A15) connectors.

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

Voltage

VOLTAGE REFERENCE CHART

Tester Connection	Specified Condition
A13-39 (DM) - Body ground	10 to 14 V
A15-38 (DI2) - Body ground	10 to 14 V

NG : REPAIR OR REPLACE HARNESS OR CONNECTOR (Dl CIRCUIT)

Fig 2: Inspecting Skid Control ECU (DL Terminal)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK : Go to Next Step

CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU TO ENGINE ROOM NO.3 R/B)

Disconnect the skid control ECU (A13, A15) connectors.
Remove the ABS MAIN1 relay and ABS MAIN2 relay.

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

Resistance

RESISTANCE REFERENCE CHART

Tester Connection	Specified Condition
A13-2 (BS1) - ABS MAIN1 relay (3)	Below 1 Ω
A13-30 (R1+) - ABS MAIN1 relay (1)	Below 1 Ω
A13-38 (DO1) - ABS MAIM relay (5)	Below 1 Ω
A13-46 (R3+) - ABS MAIN1 relay (2)	Below 1 Ω
A15-2 (BS2) - ABS MAIN2 relay (3)	Below 1 Ω
A15-30 (R2+) - ABS MAIN2 relay (1)	Below 1 Ω
A15-39 (DO2) - ABS MAIN2 relay (5)	Below 1 Ω
A15-46 (R4+) - ABS MAIN2 relay (2)	Below 1 Ω

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

Resistance

RESISTANCE REFERENCE CHART

Tester Connection	Specified Condition
A13-2 (BS1) - Body ground	10 kΩ or higher
A13-30 (R1+) - Body ground	10 kΩ or higher
A13-38 (DO1) - Body ground	10 kΩ or higher
A13-46 (R3+) - Body ground	10 kΩ or higher
A15-2 (BS2) - Body ground	10 kΩ or higher
A15-30 (R2+) - Body ground	10 kΩ or higher
A15-39 (DO2) - Body ground	10 kΩ or higher
A15-46 (R4+) - Body ground	10 kΩ or higher

NG : REPAIR OR REPLACE HARNESS OR CONNECTOR

Fig 3: Checking Harness And Connector (Skid Control ECU To Engine Room No.3 R/B)

OK : Go to Next Step

RECONFIRM DTC

Clear the DTC (see DTC CHECK/CLEAR ).
Turn the engine switch on (IG).

Check if the same DTCs are recorded (see DTC CHECK/CLEAR ).

HINT:

Reinstall the sensors, connectors, etc. and restore the vehicle to its prior condition before rechecking for DTCs.

Result

RESULT REFERENCE

Display (DTC Output)	Proceed To
DTCs (C1311/11, C1312/12, C1313/13 and C1314/14) are not output	A
DTCs (C1311/11, C1312/12, C1313/13 and C1314/14) are output	B

B : REPLACE SKID CONTROL ECU

A : END