DTC C1311/11: Open in Main Relay 1 Circuit; DTC C1312/12: Short in Main Relay 1 Circuit: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Select the Active Test on the Techstream. Refer to DATA LIST / ACTIVE TEST .
   ABS/VSC/TRAC
   
   

   Tester Display	Test Part	Control Range	Diagnostic Note
   ECB* Main Relay	ABS main relay	Relay ON/OFF	-

   *: Electronically Controlled Brake System

4. Select the Data List on the Techstream. Refer to DATA LIST / ACTIVE TEST .
   ABS/VSC/TRAC
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   ECB* Main Relay	ABS main relay / ON or OFF	ON: Relay on OFF: Relay off	-

   *: Electronically Controlled Brake System

5. Check the operating condition of the ABS main relay when operating it with the Techstream.

   Result

   Result	Proceed to
   ABS main relay in the Data List turns ON/OFF using the Active Test	A
   ABS main relay in the Data List does not change using the Active Test	B

B → See step   4 

A: Go to next step 

1. Turn the power switch off.
   Fig 1: Identifying A58 Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Make sure that there is no looseness at the locking part and the connecting part of the connector.
3. Disconnect the skid control ECU connector.
4. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   A58-15 (BS) - Body ground	Always	11 to 14 V

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to Skid Control ECU)

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (BS CIRCUIT) 

OK: Go to next step 

1. Reconnect the skid control ECU connector.
2. Clear the DTCs. Refer to DTC CHECK / CLEAR .
3. Turn the power switch on (IG).
4. Check if the same DTC is recorded. Refer to DTC CHECK / CLEAR .

   Result

   Result	Proceed to
   DTCs (C1311/11and C1312/12) are not output	A
   DTCs (C1311/11 and/or C1312/12) are output	B

B → See step   7 

A → See step   8 

1. Turn the power switch off.
   Fig 2: Identifying ABS & MAIN Fuses From The Engine Room Relay Block

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Remove the ABS MAIN fuses from the engine room relay block and junction block assembly.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   ABS MAIN NO. 1 (20 A) fuse	Always	Below 1 Ω
   ABS MAIN NO. 2 (7.5 A) fuse	Always	Below 1 Ω

   TEXT IN ILLUSTRATION
   
   

   *1	Engine Room Relay Block and Junction Block Assembly
   *2	ABS MAIN NO. 1 Fuse
   *3	ABS MAIN NO. 2 Fuse

NG → REPLACE ABS MAIN FUSES 

OK: Go to next step 

1. Install the ABS MAIN fuses.
   Fig 3: Identifying A58 Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Make sure that there is no looseness at the locking part and the connecting part of the connector.
3. Disconnect the skid control ECU connector.
4. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   A58-14 (BI) - Body ground	Always	11 to 14 V

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to Skid Control ECU)

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (BI CIRCUIT) 

OK: Go to next step 

1. Measure the voltage according to the value(s) in the table below.
   Fig 4: Identifying A58 Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   A58-15 (BS) - Body ground	Always	11 to 14 V

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to Skid Control ECU)

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (BS CIRCUIT) 

OK → See step   7