Last Modified: 01-30-2024 6.11:8.1.0 Doc ID: RM10000000214RF
Model Year Start: 2022 Model: RAV4 Prod Date Range: [12/2021 -           ]
Title: BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (w/o Vacuum Brake Booster): C123D00; IG2 Malfunction; 2022 - 2024 MY RAV4 RAV4 HV [12/2021 -        ]

DTC

C123D00

IG2 Malfunction

DESCRIPTION

Refer to DTC C110E14.

Click here 2022 - 2024 MY RAV4 RAV4 HV [12/2021 -        ]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (w/o Vacuum Brake Booster): C110E14; Brake Booster Motor "A" Supply Voltage Circuit Short to Ground or Open+

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Note

C123D00

IG2 Malfunction

When communication with the hybrid vehicle control ECU is normal or the vehicle speed is 10 km/h (6 mph) or more, and the IG1 terminal voltage is 10.2 V or more, the IG2 terminal voltage is less than 2.8 V for 4 seconds or more.

  • Open or short in IG2 circuit
  • Improperly connected connector, deformation or corrosion of terminals
  • No. 1 skid control ECU (brake booster with master cylinder assembly)

Comes on

  • SAE Code: C123E (Case 1)
  • Output ECU: Both skid control ECUs

C123D00 DTC Detection Conditions

 

Vehicle Condition

Pattern 1

Pattern 2

Diagnosis Condition

When communication with the hybrid vehicle control ECU is normal

-

The vehicle speed is 10 km/h (6 mph) or more

-

Malfunction Status

The IG1 terminal voltage is 10.2 V or more, the IG2 terminal voltage is less than 2.8 V

Detection Time

4 seconds or more.

4 seconds or more.

Number of Trips

1 trip

1 trip

HINT:

DTC will be output when conditions for either of the patterns in the table above are met.

MONITOR DESCRIPTION

During normal operation, the voltage at IG1 and IG2 change mutually; however, if the voltages do not change mutually such as when IG1 is on and IG2 is off, the No. 2 skid control ECU (brake actuator assembly) judges that there is an open in the IG2 circuit and illuminates the MIL and stores this DTC.

MONITOR STRATEGY

Related DTCs

C123E (Case 1): Brake system voltage input open circuit

Required Sensors/Components(Main)

No. 2 skid control ECU (brake actuator assembly)

Required Sensors/Components(Related)

Speed sensor

No. 2 skid control ECU (brake actuator assembly)

Frequency of Operation

Continuous

Duration

3.996 seconds

MIL Operation

Immediately

Sequence of Operation

None

TYPICAL ENABLING CONDITIONS

Monitor runs whenever the following DTCs are not stored

C1241: Brake system voltage input out of range low

Both of the following conditions are met

A and B

A. IG1 voltage

Higher than 10.2 V

B. Either of the following conditions is met

-

The second highest speed sensor output value

Higher than 10 km/h (6.21 mph)

Communication status with hybrid control system

Valid

TYPICAL MALFUNCTION THRESHOLDS

IG2 voltage

Less than 2.8 V

COMPONENT OPERATING RANGE

Both of the following conditions are met

-

IG1 voltage

Higher than 10.2 V

IG2 voltage

3.8 V or more

CONFIRMATION DRIVING PATTERN

NOTICE:

When performing the normal judgment procedure, make sure that the driver door is closed and is not opened at any time during the procedure.

HINT:

  • After repair has been completed, clear the DTC and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.
  • When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.
  1. Connect the GTS to the DLC3.
  2. Turn the ignition switch to ON and turn the GTS on.
  3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  4. Turn the ignition switch off.
  5. Turn the ignition switch to ON (READY) and turn the GTS on.
  6. Wait for 4 seconds or more. [*]

    HINT:

    [*]: Normal judgment procedure.

    The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.

  7. Enter the following menus: Chassis / Brake/EPB / Utility / All Readiness.
  8. Check the DTC judgment result.

    HINT:

    • If the judgment result shows NORMAL, the system is normal.
    • If the judgment result shows ABNORMAL, the system has a malfunction.
    • If the judgment result shows INCOMPLETE, perform driving pattern again.

WIRING DIAGRAM

Refer to DTC C110E14.

Click here 2022 - 2024 MY RAV4 RAV4 HV [12/2021 -        ]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (w/o Vacuum Brake Booster): C110E14; Brake Booster Motor "A" Supply Voltage Circuit Short to Ground or Open

CAUTION / NOTICE / HINT

NOTICE:

  • Inspect the fuses for circuits related to this system before performing the following procedure.
  • Before performing troubleshooting, make sure to confirm that the auxiliary battery voltage is normal.

    Click here 2019 - 2024 MY RAV4 RAV4 HV [11/2018 -        ]; INTRODUCTION: HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS: HOW TO PROCEED WITH TROUBLESHOOTING

  • After replacing the No. 1 skid control ECU (brake booster with master cylinder assembly), perform "Calibration" after performing "Reset Memory".

    Click here 2022 - 2024 MY RAV4 RAV4 HV [12/2021 -        ]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (w/o Vacuum Brake Booster): UTILITY

PROCEDURE

1.

CHECK HARNESS AND CONNECTOR (IG2 TERMINAL)

(a) Make sure that there is no looseness at the locking part and the connecting part of the connector.

OK:

The connector is securely connected.

*a

Front view of wire harness connector

(to No. 1 Skid Control ECU (Brake Booster with Master Cylinder Assembly))

(b) Disconnect the A104 No. 1 skid control ECU (brake booster with master cylinder assembly) connector.

(c) Check both the connector case and the terminals for deformation and corrosion.

OK:

No deformation or corrosion.

(d) Turn the ignition switch to ON.

(e) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Condition

Specified Condition

A104-42 (IG2) - Body ground

Ignition switch ON

11 to 14 V

Result

Proceed to

11 to 14 V.

A

Below 11 V.

B

A

REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY 2022 MY RAV4 RAV4 HV [12/2021 - 10/2022]; BRAKE SYSTEM (OTHER): BRAKE BOOSTER (w/o Vacuum Brake Booster): REMOVAL 2023 MY RAV4 RAV4 HV [10/2022 - 10/2023]; BRAKE SYSTEM (OTHER): BRAKE BOOSTER (w/o Vacuum Brake Booster): REMOVAL 2024 MY RAV4 RAV4 HV [10/2023 -        ]; BRAKE SYSTEM (OTHER): BRAKE BOOSTER (w/o Vacuum Brake Booster): REMOVAL

B

REPAIR OR REPLACE HARNESS OR CONNECTOR