Lexus ES manuals

Lexus ES: Motor Circuit (C1428)

Lexus ES (XZ10) Service Manual / Brake / Brake Control / Dynamic Control Systems / Electronically Controlled Brake System (for Hv Model) / Motor Circuit (C1428)

DESCRIPTION

DTC No.

Detection Item

INF Code

DTC Detection Condition

Trouble Area

MIL

Note

C1428

Motor Circuit

611

1160
  • INF Code: 611
    • An open or short in the ABS motor circuit is detected for 2 seconds or more.
  • INF Code: 1160
    • The ABS motor voltage is 18.5 V or more for 0.2 seconds or more.

Brake actuator assembly

Comes on
  • INF Code 611: SAE Code C052B
  • INF Code 1160: SAE Code C052D (Case 2)
  • ABS DTC

MONITOR DESCRIPTION

The skid control ECU (brake booster with master cylinder assembly) monitors the voltage of the ABS motor. When the ABS motor relay is instructed to be off and the voltage of the ABS motor is at a value that is not possible when normal, the skid control ECU (brake booster with master cylinder assembly) judges that the circuit of the ABS motor is malfunctioning and illuminates the MIL and stores a DTC.

MONITOR STRATEGY

Related DTCs

C052B: ABS pump motor range/performance

C052D (Case 2): ABS pump motor circuit high

Required Sensors/Components(Main)

Brake actuator assembly

Required Sensors/Components(Related)

Skid control ECU (brake booster with master cylinder assembly)

Frequency of Operation

Continuous

Duration

0.2 seconds: C052D (Case 2)

2 seconds: C052B

MIL Operation

Immediately

Sequence of Operation

None

TYPICAL ENABLING CONDITIONS

All

Monitor runs whenever the following DTCs are not stored

None
C052B

Command to ABS motor relay

Off

TYPICAL MALFUNCTION THRESHOLDS

C052B

ABS pump motor voltage

Higher than 1.448 V, and less than 7.607 V
C052D (Case 2)

ABS pump motor voltage

18.57 V or more

COMPONENT OPERATING RANGE

C052B

Both of the following conditions are met

-

Command to ABS motor relay

Off

ABS pump motor voltage

1.448 V or less, or 7.607 V or more
C052D (Case 2)

ABS pump motor voltage

Less than 18.57 V

CONFIRMATION DRIVING PATTERN

  1. Connect the Techstream to the DLC3.
  2. Turn the power switch on (IG).
  3. Turn the Techstream on.
  4. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  5. Turn the power switch off.
  6. Turn the power switch on (IG).
  7. Turn the Techstream on.
  8. Wait 2 seconds.
  9. Enter the following menus: Chassis / ABS/VSC/TRAC / Trouble Codes.
  10. Read the DTCs.

    HINT:

    • If a DTC is output, the system is malfunctioning.
    • If a DTC is not output, perform the following procedure.
  11. If the DTCs are not output, perform a universal trip and check for permanent DTCs.

    Click here

    HINT:

    • If a permanent DTC is output, the system is malfunctioning.
    • If no permanent DTCs are output, the system is normal.

WIRING DIAGRAM

Refer to DTC C1427.

Click here

CAUTION / NOTICE / HINT

NOTICE:

After replacing the brake actuator assembly, perform linear solenoid valve offset learning, ABS holding solenoid valve learning, yaw rate and acceleration sensor zero point calibration and system information memorization after performing "Reset Memory".

Click here

PROCEDURE

1.

CHECK HARNESS AND CONNECTOR (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY - BRAKE ACTUATOR ASSEMBLY)

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

OK:

The connector is securely connected.

(b) Disconnect the A45 skid control ECU (brake booster with master cylinder assembly) connector.

(c) Disconnect the A54 brake actuator assembly connector.

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

OK:

No deformation or corrosion.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A45-40 (+BM) - A54-10 (+BM)

Always

Below 1 Ω

A45-40 (+BM) or A54-10 (+BM) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

2.

CHECK HARNESS AND CONNECTOR (GND TERMINAL)

(a) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

A54-1 (MGND) - Body ground

Always

Below 1 Ω

*a

Front view of wire harness connector

(to Brake Actuator Assembly)
OK

REPLACE BRAKE ACTUATOR ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (GND CIRCUIT)

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