DTC C1311/11: Open in Main Relay 1 Circuit; DTC C1312/12: Short in Main Relay 1 Circuit; DTC C1313/13: Open in Main Relay 2 Circuit; DTC C1314/14: Short in Main Relay 2 Circuit: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Select the Active Test mode on the Techstream.
   CHECKING FOR ABS MAIN RELAY OPERATION SOUND
   
   

   Tester Display	Test Part	Control Range	Diagnostic Note
   ECB* Main Relay	ABS main relay	Relay ON / OFF	Operation of relay (clicking sound) can be heard
   ECB* Main Relay 2	ABS main relay 2	Relay ON / OFF	Operation of relay (clicking sound) can be heard

   *: Electronically Controlled Brake

4. 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 → See step   5 

OK: Go to next step 

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 

1. Remove the ABS MAIN1 relay and ABS MAIN2 relay.
   Fig 1: Inspecting ABS Main Relay

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Resistance

   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 

OK: Go to next step 

1. Disconnect the skid control ECU (A13, A15) connectors.
   Fig 2: Inspecting Skid Control ECU (DI Terminal)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the voltage according to the value(s) in the table below.

   Voltage

   Tester Connection	Specified Condition
   A13-39 (DI1) - Body ground	10 to 14 V
   A15-38 (DI2) - Body ground	10 to 14 V

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

OK: Go to next step 

1. Disconnect the skid control ECU (A13, A15) connectors.
   Fig 3: Checking Harness And Connector (Skid Control ECU To Engine Room No. 3 R/B)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Remove the ABS MAIN1 relay and ABS MAIN2 relay.
3. Measure the resistance according to the value(s) in the table below.

   Resistance

   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 MAIN1 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

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

   Resistance

   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 

OK: Go to next step 

1. Clear the DTC. Refer to DTC CHECK / CLEAR .
2. Turn the engine switch on (IG).
3. Check if the same DTCs are recorded. Refer to DTC CHECK / CLEAR .

   HINT: 

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

   Result

   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