Lexus ES manuals

Lexus ES: Left Front Wheel ABS Hold Solenoid Control Circuit Short to Battery (C12A512,...,C12B049)

Lexus ES (XZ10) Service Manual / Brake / Brake Control / Dynamic Control Systems / Electronically Controlled Brake System (for Gasoline Model) / Left Front Wheel ABS Hold Solenoid Control Circuit Short to Battery (C12A512,...,C12B049)

DESCRIPTION

The ABS solenoid relay and solenoid valves are built into the brake actuator assembly.

The front solenoid valve LH controls the brake fluid pressure of the front wheel cylinder LH of the vehicle.

When this DTC is stored, the fail-safe function operates and the ABS solenoid relay is turned off to prevent the solenoid valves from operating.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

C12A512

Left Front Wheel ABS Hold Solenoid Control Circuit Short to Battery

A short to +B in the solenoid circuit is detected during the self test.

Skid control ECU (brake actuator assembly)

C12A514

Left Front Wheel ABS Hold Solenoid Control Circuit Short to Ground or Open

An open or short in the solenoid circuit is detected during the self test.

Skid control ECU (brake actuator assembly)

C12A51C

Left Front Wheel ABS Hold Solenoid Control Circuit Voltage Out of Range

  • A current leak in the solenoid circuit is detected during the self test.
  • The solenoid operation request signal and solenoid operation feedback signal do not match for a certain period of time.

Skid control ECU (brake actuator assembly)

C12A51E

Left Front Wheel ABS Hold Solenoid Control Circuit Resistance Out of Range

An abnormal resistance in the solenoid circuit is detected during the self test.

Skid control ECU (brake actuator assembly)

C12A549

Left Front Wheel ABS Hold Solenoid Control Internal Electronic Failure

An internal malfunction in the solenoid circuit is detected during the self test.

Skid control ECU (brake actuator assembly)

C12B012

Left Front Wheel ABS Release Solenoid Control Circuit Short to Battery

A short to +B in the solenoid circuit is detected during the self test.

Skid control ECU (brake actuator assembly)

C12B014

Left Front Wheel ABS Release Solenoid Control Circuit Short to Ground or Open

An open or short in the solenoid circuit is detected during the self test.

Skid control ECU (brake actuator assembly)

C12B01C

Left Front Wheel ABS Release Solenoid Control Circuit Voltage Out of Range

  • A current leak in the solenoid circuit is detected during the self test.
  • The solenoid operation request signal and solenoid operation feedback signal do not match for a certain period of time.

Skid control ECU (brake actuator assembly)

C12B01E

Left Front Wheel ABS Release Solenoid Control Circuit Resistance Out of Range

An abnormal resistance in the solenoid circuit is detected during the self test.

Skid control ECU (brake actuator assembly)

C12B049

Left Front Wheel ABS Release Solenoid Control Internal Electronic Failure

An internal malfunction in the solenoid circuit is detected during the self test.

Skid control ECU (brake actuator assembly)

DTC Detection Conditions: C12A514
 

Vehicle Condition

Pattern 1

Pattern 2

Diagnosis Condition

-

-

-

Malfunction Status

An open in the solenoid circuit is detected during the self test.

-

A short in the solenoid circuit is detected during the self test.

-

Detection Time

-

-

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.

DTC Detection Conditions: C12A51C
 

Vehicle Condition

Pattern 1

Pattern 2

Diagnosis Condition

-

-

-

Malfunction Status

A current leak in the solenoid circuit is detected during the self test.

-

The solenoid operation request signal and solenoid operation feedback signal do not match for a certain period of time.

-

Detection Time

-

-

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.

DTC Detection Conditions: C12B014
 

Vehicle Condition

Pattern 1

Pattern 2

Diagnosis Condition

-

-

-

Malfunction Status

An open in the solenoid circuit is detected during the self test.

-

A short in the solenoid circuit is detected during the self test.

-

Detection Time

-

-

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.

DTC Detection Conditions: C12B01C
 

Vehicle Condition

Pattern 1

Pattern 2

Diagnosis Condition

-

-

-

Malfunction Status

A current leak in the solenoid circuit is detected during the self test.

-

The solenoid operation request signal and solenoid operation feedback signal do not match for a certain period of time.

-

Detection Time

-

-

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.

CAUTION / NOTICE / HINT

NOTICE:

After replacing the skid control ECU (brake actuator assembly), perform acceleration sensor zero point calibration and store system information memorization.

Click here

PROCEDURE

1.

REPLACE BRAKE ACTUATOR ASSEMBLY

(a) Replace the skid control ECU (brake actuator assembly).

Click here

NEXT

END

READ NEXT:

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SEE MORE:

 Installation

INSTALLATION CAUTION / NOTICE / HINT NOTICE: This procedure includes the installation of small-head bolts. Refer to Small-Head Bolts of Basic Repair Hint to identify the small-head bolts. Click here PROCEDURE 1. INSTALL VACUUM PUMP ASSEMBLY (a) When reusing the vacuum pump assembly: (1) Install

 On-vehicle Inspection

ON-VEHICLE INSPECTION PROCEDURE 1. SECURE VEHICLE (a) Fully apply the parking brake and chock a wheel. CAUTION: Make sure to apply the parking brake and chock a wheel before performing this procedure. If the vehicle is not secure and the shift lever is moved to N, the vehicle may suddenly move,

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