DTC C1311/11: Open in Main Relay 1 Circuit; DTC C1312/12: Short in Main Relay 1 Circuit [10/2014 - ]: Procedure
- PERFORM ACTIVE TEST USING TECHSTREAM (ABS MAIN RELAY)
- Connect the Techstream to the DLC3.
- Turn the power switch on (IG).
- Select the Active Test on the Techstream (Refer to DATA LIST / ACTIVE TEST [10/2014 - 10/2015]
or DATA LIST / ACTIVE TEST [10/2015 - ]
).ABS/VSC/TRAC
Tester Display Test Part Control Range Diagnostic Note ECB* Main Relay ABS main relay Relay ON/OFF - *: Electronically Controlled Brake System
- Select the Data List on the Techstream (Refer to DATA LIST / ACTIVE TEST [10/2014 - 10/2015]
or DATA LIST / ACTIVE TEST [10/2015 - ]
).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
- Check that the condition of the ABS main relay observed on the Techstream changes according to Techstream operation.
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
Result:
B
See step 4
Result:
A
See step 2
- CHECK HARNESS AND CONNECTOR (BS TERMINAL)
- Turn the power switch off.
- Make sure that there is no looseness at the locking part and the connecting part of the connector.
- Disconnect the A51 skid control ECU (brake booster with master cylinder assembly) connector.
- Measure the voltage according to the value (s) in the table below.
Standard Voltage
Tester Connection Condition Specified Condition A51-15 (BS) - Body ground Always 11 to 14 V TEXT IN ILLUSTRATION*a Front view of wire harness connector
(to Skid Control ECU (Brake Booster with Master Cylinder Assembly))
Result:
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (BS CIRCUIT)
Result:
OK
See step 3
- Turn the power switch off.
- RECONFIRM DTC
- Reconnect the A51 skid control ECU (brake booster with master cylinder assembly) connector.
- Clear the DTCs (Refer to DTC CHECK / CLEAR [10/2014 - ] ).
- Turn the power switch on (IG).
- Check if the same DTC is output (Refer to DTC CHECK / CLEAR [10/2014 - ]
).
Result
Result Proceed to DTCs C1311/11 and C1312/12 are not output. A DTCs C1311/11 and/or C1312/12 are output. B
Result:
A
USE SIMULATION METHOD TO CHECK
(Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2014 - 10/2015] or HOW TO PROCEED WITH TROUBLESHOOTING [10/2015 - ] )
Result:
B
REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY
(Refer to REMOVAL [10/2014 - ] )
- CHECK HARNESS AND CONNECTOR (BI TERMINAL)
- Turn the power switch off.
- Make sure that there is no looseness at the locking part and the connecting part of the connector.
- Disconnect the A51 skid control ECU (brake booster with master cylinder assembly) connector.
- Measure the voltage according to the value (s) in the table below.
Standard Voltage
Tester Connection Condition Specified Condition A51-14 (BI) - Body ground Always 11 to 14 V TEXT IN ILLUSTRATION*a Front view of wire harness connector
(to Skid Control ECU (Brake Booster with Master Cylinder Assembly))
Result:
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (BI CIRCUIT)
Result:
OK
See step 5
- Turn the power switch off.
- CHECK HARNESS AND CONNECTOR (BS TERMINAL)
- Measure the voltage according to the value (s) in the table below.
Standard Voltage
Tester Connection Condition Specified Condition A51-15 (BS) - Body ground Always 11 to 14 V TEXT IN ILLUSTRATION*a Front view of wire harness connector
(to Skid Control ECU (Brake Booster with Master Cylinder Assembly))
Result:
OK
REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY
(Refer to REMOVAL [10/2014 - ] )
Result:
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (BS CIRCUIT)
- Measure the voltage according to the value (s) in the table below.