DTC C123A-00: IG1 Malfunction [12/2021 - ]: Procedure
- CHECK HARNESS AND CONNECTOR (IG1 TERMINAL)
- Make sure that there is no looseness at the locking part and the connecting part of the connector.
*a Front view of wire harness connector
(to No. 1 Skid Control ECU (Brake Booster with Master Cylinder Assembly))OK
The connector is securely connected.
- Disconnect the A104 No. 1 skid control ECU (brake booster with master cylinder assembly) connector.
- Check both the connector case and the terminals for deformation and corrosion.
OK
No deformation or corrosion.
- Turn the ignition switch to ON.
- Measure the voltage according to the value(s) in the table below.
Standard Voltage
Tester Connection Condition Specified Condition A104-31 (IG1) - Body ground Ignition switch ON 11 to 14 V Result
Result Proceed to 11 to 14 V. A Below 11 V. B
Result:
A
REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY. Refer to REMOVAL [12/2021 - 10/2022] , or refer to REMOVAL [10/2022 - 10/2023] , or refer to REMOVAL [10/2023 - ]
Result:
B
REPAIR OR REPLACE HARNESS OR CONNECTOR
- Make sure that there is no looseness at the locking part and the connecting part of the connector.