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 [09/2014 - ]: Procedure

1. Make sure that there is no looseness at the locking part and the connecting part of the connectors.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

2. Disconnect the skid control ECU assembly connectors.
3. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   A14-43 (+BI1) - Body ground	Always	11 to 14 V
   A16-38 (+BI2) - Body ground	Always	11 to 14 V
   A14-29 (+BI3) - Body ground	Always	11 to 14 V
   A16-22 (+BI4) - Body ground	Always	11 to 14 V

   TEXT IN ILLUSTRATION
   
   

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

Result:  NG

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR (+BI CIRCUIT) 

Result:  OK

OK 

See step  2

1. Reconnect the skid control ECU assembly connectors.
2. Clear the DTCs (See page. Refer to DTC CHECK / CLEAR [09/2014 - ] ).
3. Turn the power switch on (IG).
4. Check if the same DTC is output (See page. Refer to DTC CHECK / CLEAR [09/2014 - ] ).

   Result

   Result	Proceed to
   DTCs (C1311/11, C1312/12, C1313/13 and C1314/14) are not output	A
   DTCs (C1311/11, C1312/12, C1313/13 and/or C1314/14) are output	B

Result:  A

A 

CHECK FOR INTERMITTENT PROBLEMS 

(See page. Refer to HOW TO PROCEED WITH TROUBLESHOOTING [09/2014 - 10/2015] Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2015 - ] )

Result:  B

B 

REPLACE SKID CONTROL ECU ASSEMBLY 

(See page. Refer to REMOVAL [09/2014 - ] )