Lexus NX: Linear Solenoid Valve Offset Learning undone (C1345,C1368)

Lexus NX Service Manual / Brake / Brake Control / Dynamic Control Systems / Electronically Controlled Brake System / Linear Solenoid Valve Offset Learning undone (C1345,C1368)

DESCRIPTION

The skid control ECU (brake booster with master cylinder assembly) stores and corrects the individual differences in the brake pedal stroke sensor assembly, actuator solenoids, and stroke simulator solenoid. Perform initialization and calibration of the linear solenoid valve if any of these parts is replaced.

The skid control ECU (brake booster with master cylinder assembly) receives the shift position P signal from the hybrid vehicle control ECU through the CAN communication system.

These DTCs are cleared when the linear valve offset learning results are normal.

DTC No.

Detection Item

INF Code

DTC Detection Condition

Trouble Area

Note

C1345

Linear Solenoid Valve Offset Learning undone

-

Linear valve offset learning undone.

Perform linear valve offset learning and check for DTCs. If no DTCs are output again, the valve is normal.

-

C1368

Linear Solenoid Valve Offset

-

Offset learned value out of specification.

  • Perform linear valve offset learning and check for DTCs. If no DTCs are output again, the valve is normal.
  • Brake actuator (Brake booster with master cylinder assembly)

-

CAUTION / NOTICE / HINT

NOTICE:

When replacing the brake actuator (brake booster with master cylinder assembly), perform initialization and calibration of the linear solenoid valve.

Click here

HINT:

When C1451 is output together with C1345 and/or C1368, inspect and repair the trouble areas indicated by C1451 first.

Click here

PROCEDURE

1.

CHECK DTC

(a) Clear the DTCs.

Click here

Chassis > ABS/VSC/TRAC > Clear DTCs

(b) Turn the power switch off.

(c) Turn the power switch on (IG).

(d) Check the DTCs (electronically controlled brake system and hybrid control system) that are output.

for Electronically Controlled Brake System: Click here

for Hybrid Control System: Click here

Chassis > ABS/VSC/TRAC > Trouble Codes Powertrain > Hybrid Control > Trouble Codes

Result

Proceed to

DTCs (except C1345, C1368 and hybrid control system DTCs) are not output.

A

Hybrid control system DTCs are output.

B

DTCs (except C1345 and/or C1368) are output.

C

HINT:

Before performing initialization and calibration of the linear solenoid valve, C1203/95 will be output.

B

INSPECT HYBRID CONTROL SYSTEM

C

REPAIR CIRCUITS INDICATED BY OUTPUT DTCS

A

2.

PERFORM INITIALIZATION AND CALIBRATION OF LINEAR SOLENOID VALVE

(a) Turn the power switch off.

(b) Perform initialization and calibration of the linear solenoid valve.

Click here

Chassis > ABS/VSC/TRAC > Utility

Tester Display

ECB Utility

NEXT

3.

RECONFIRM DTC

(a) Turn the power switch off.

(b) Clear the DTCs.

Click here

Chassis > ABS/VSC/TRAC > Clear DTCs

(c) Turn the power switch off.

(d) Turn the power switch on (IG).

(e) Check if the same DTC is output.

Click here

Chassis > ABS/VSC/TRAC > Trouble Codes

Result

Proceed to

DTCs C1345 and C1368 are not output.

A

DTCs C1345 and/or C1368 are output.

B

A

END

B

REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY

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