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Last Modified: 11-27-2007 1.6 C
Service Category: Brake Section: Brake Control/Dynamic Control System
Model Year: 2008 Model: LX570 Doc ID: RM000001DXQ00GX
Title: BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: DESCRIPTION (2008 LX570)

DTC

C0278/11

Open or Short Circuit in ABS Solenoid Relay Circuit

DTC

C0279/12

Short to B+ in ABS Solenoid Relay Circuit

DESCRIPTION

The solenoid relay is built into the master cylinder solenoid.

This relay supplies power to each solenoid. If the initial check is OK, after the engine switch is turned on (IG), the relay turns on.

DTC Code

DTC Detection Condition

Trouble Area

C0278/11

When either of the following conditions is detected:

  1. Both of the following conditions continue for at least 0.2 seconds.
    1. IG voltage is between 9.5 V and 17 V.
    2. The relay contact is open when the relay is on.
  2. Both of the following conditions continue for at least 0.2 seconds.
    1. IG voltage is 9.5 V or less when the relay is on.
    2. The relay contact remains open.
  • ABS2 fuse
  • Solenoid relay
  • Harness or connector
  • Master cylinder solenoid (Skid control ECU)

C0279/12

The following condition continues for at least 0.2 seconds.

  • The relay contact is closed immediately after turning the engine switch on (IG) when the relay is off.
  • ABS2 fuse
  • Solenoid relay
  • Harness or connector
  • Master cylinder solenoid (Skid control ECU)

WIRING DIAGRAM

INSPECTION PROCEDURE

NOTICE:

When replacing the master cylinder solenoid, perform zero point calibration BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: CALIBRATION (2008 LX570) .

PROCEDURE

1.

INSPECT ABS2 FUSE

(a) Remove the ABS2 fuse from the engine room relay block.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

ABS2 fuse

Always

Below 1 Ω
OK

2.

INSPECT SKID CONTROL ECU (+BS TERMINAL)

(a) Install the ABS2 fuse.

(b) Disconnect the A24 skid control ECU connector.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

A24-31 (+BS) - Body ground

Always

11 to 14 V
OK

3.

INSPECT SKID CONTROL ECU (GND TERMINAL)

(a) Disconnect the A24 and A25 skid control ECU connectors.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A24-1 (GND1) - Body ground

Always

Below 1 Ω

A24-32 (GND2) - Body ground

Always

Below 1 Ω

A25-4 (GND3) - Body ground

Always

Below 1 Ω
OK

4.

RECONFIRM DTC

HINT:

These codes are stored when a problem is detected in the master cylinder solenoid.

The ABS solenoid relay is in the master cylinder solenoid.

Therefore, solenoid relay circuit inspection and relay unit inspection cannot be performed. Be sure to check if any DTC is output before replacing the master cylinder solenoid.

(a) Clear the DTCs BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: DTC CHECK / CLEAR (2008 LX570) .

(b) Drive the vehicle at a speed of approximately 32 km/h (20 mph) or more for 60 seconds or more.

(c) Check if the same DTCs are output BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: DTC CHECK / CLEAR (2008 LX570) .

HINT:

Reinstall the sensors, connectors, etc. and restore the previous vehicle conditions before rechecking for DTCs.

Result

Result

Proceed to

DTC is output.

A

DTC is not output.

B
A