Inspection Procedure

1. Check if a CAN communication system DTC is output (See DIAGNOSIS SYSTEM )

   Result 

   RESULT REFERENCE
   
   

   Result	Proceed to
   DTC is not output	A
   DTC is output	B

B: INSPECT CAN COMMUNICATION SYSTEM  (See HOW TO PROCEED WITH TROUBLESHOOTING )

A: Go to next step 

1. Check if a multiplex communication system DTC is output (See DIAGNOSTIC TROUBLE CODE CHART )

   Result 

   RESULT REFERENCE
   
   

   Result	Proceed to
   DTC is not output	A
   DTC is output	B

B: INSPECT MULTIPLEX COMMUNICATION SYSTEM  (See DIAGNOSTIC TROUBLE CODE CHART )

A: Go to next step 

1. Check if the skid control ECU connector is securely connected

   OK: The connector is securely connected. 

NG: CONNECT CONNECTOR TO ECU CORRECTLY  (See ELECTRONIC CIRCUIT INSPECTION PROCEDURE )

OK: Go to next step 

1. Check the battery voltage

   Standard Voltage: 

   11 to 14 V 

NG: CHECK OR REPLACE CHARGING SYSTEM OR BATTERY (for 2UR-GSE)  (See ON-VEHICLE INSPECTION )

OK: Go to next step 

1. Disconnect the skid control ECU connector
2. Turn the engine switch on (IG).
3. Measure the voltage according to the value(s) in the table below

   Standard Voltage 

   STANDARD VOLTAGE
   
   

   Tester Connection	Switch Condition	Specified Condition
   J77-1 (IG1) - Body ground	Engine switch on (IG)	11 to 14 V

Fig 1: Identifying Skid Control ECU (IG1 Terminal)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (IG1 CIRCUIT) 

OK: Go to next step 

1. Turn the engine switch off
2. Disconnect the skid control ECU connectors.
3. Measure the resistance according to the value(s) in the table below

   Standard Resistance 

   STANDARD RESISTANCE
   
   

   Tester Connection	Condition	Specified Condition
   J78-26 (GND1) - Body ground	Always	Below 1 Ω
   J78-14 (GND2) - Body ground	Always	Below 1 Ω
   A35-22 (GND3) - Body ground	Always	Below 1 Ω

Fig 2: Identifying Skid Control ECU (GND1 Terminal)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (GND1 CIRCUIT) 

OK: Go to next step 

1. Reconnect the skid control ECU connectors
2. Connect the Techstream to the DLC3
3. Turn the engine switch on (IG)
4. Select the Data List mode on the Techstream (See DATA LIST / ACTIVE TEST  )

   ABS/VSC/TRAC 

   NORMAL CONDITION
   
   

   Tester Display	Measurement Item / Range	Normal Condition	Diagnostic Note
   Parking Brake SW	Parking brake switch / ON or OFF	ON Parking brake applied OFF Parking brake released	-

5. Using the Techstream, check that the switch condition on the Techstream display changes according to parking brake pedal operation

   OK: The Techstream displays ON or OFF according to parking brake pedal operation. 

NG: Go to step  11

OK: Go to next step 

1. Turn the engine switch off
2. Remove the reservoir filler cap and strainer.
3. Disconnect the brake fluid level warning switch connector
4. Measure the resistance according to the value(s) in the table below.

   HINT.

   A float is located inside the reservoir. Its position can be changed by increasing or decreasing the level of brake fluid.

   Standard Resistance 

   STANDARD RESISTANCE
   
   

   Tester Connection	Switch Condition	Specified Condition
   1 (+) - 2 (E)	Brake fluid level warning switch OFF (Float up)	1.9 to 2.1 kΩ
   1 (+) - 2 (E)	Brake fluid level warning switch ON (Float down)	Below 1 Ω

   Fig 3: Identifying Brake Fluid Level Warning Switch

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   HINT:

   If there are no problems after finishing the above check, adjust the brake fluid level to the MAX level

NG: REPLACE BRAKE MASTER CYLINDER RESERVOIR ASSEMBLY (BRAKE FLUID LEVEL WARNING SWITCH)  (See DISASSEMBLY )

OK: Go to next step 

1. Disconnect the combination meter connector
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance 

   STANDARD RESISTANCE
   
   

   Tester Connection	Condition	Specified Condition
   J35-15 (SW) - A16-1 (+)	Always	Below 1 Ω
   J35-15 (SW) - Body ground	Always	10 kΩ or higher
   A16-2 (E) - Body ground	Always	Below 1 Ω

Fig 4: Identifying Harness And Connector (Combination Meter - Brake Fluid Level Warning Switch)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Perform the Active Test of the combination meter (meter CPU) using the Techstream (See DATA LIST / ACTIVE TEST ).
2. Check the combination meter

   HINT.

   Reinstall the connectors and restore the vehicle to its prior condition before checking the combination meter.

   OK: The brake warning light turns on or off in accordance with the Techstream operation. 

   HINT.

   If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step before replacing the part (See PROBLEM SYMPTOMS TABLE  ).

NG: REPLACE COMBINATION METER ASSEMBLY  (See REMOVAL )

OK: REPLACE SKID CONTROL ECU  (See REMOVAL  )

1. Turn the engine switch off
2. Disconnect the parking brake switch connector
3. Measure the resistance according to the value(s) in the table below

   Standard Resistance 

   STANDARD RESISTANCE
   
   

   Tester Connection	Switch Condition	Specified Condition
   1 - Body ground	Parking brake switch ON (Switch pin free)	Below 1 Ω
   1 - Body ground	Parking brake switch OFF (Switch pin pushed in)	10 kΩ or higher

Fig 5: Identifying Parking Brake Switch
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE PARKING BRAKE SWITCH  (See REMOVAL )

OK: Go to next step 

1. Disconnect the skid control ECU connector
2. Measure the resistance according to the value(s) in the table below

   Standard Resistance 

   STANDARD RESISTANCE
   
   

   Tester Connection	Condition	Specified Condition
   J77-14 (PKB) - A25-1	Always	Below 1 Ω
   J77-14 (PKB) - Body ground	Always	10 kΩ or higher

   HINT.

   If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step before replacing the part (See PROBLEM SYMPTOMS TABLE  ).

   Fig 6: Identifying Harness And Connector (Skid Control ECU - Parking Brake Switch)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: REPLACE SKID CONTROL ECU  (See REMOVAL  )