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. Remove the ABS1, ABS MAIN2 and ABS MAIN3 fuses from the engine room No. 1 relay block (junction block).
2. Check the ABS1, ABS MAIN2 and ABS MAIN3 fuses.

   Standard resistance

   Below 1 Ω

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 No. 3 Fan Relay

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

   Standard resistance

   Tester Connection	Specified Condition
   3 - 5	10 kΩ or higher (No continuity)
   3 - 5	Below 1 Ω (when battery voltage is applied to terminals 1 and 2)

NG → REPLACE ABS MAIN RELAY 

OK: Go to next step 

1. Disconnect the A13 and A15 ECU connectors.
   Fig 2: Identifying A13 And A15 Connectors Terminals

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

   Standard 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 A13 and A15 ECU connectors.
   Fig 3: Identifying A13 And A15 Connectors Terminals

   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.

   Standard 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
   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 power 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
   
   

   Condition	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 → See step   6 

A → END