Lexus NX: Different Diameter Tire Malfunction (C1348)

DESCRIPTION

If the hybrid vehicle control ECU receives a signal from the skid control ECU (brake booster with master cylinder assembly) that the AWD system is malfunctioning, the hybrid vehicle control ECU outputs this DTC.

DTC No.

Detection Item

INF Code

DTC Detection Condition

Trouble Area

Note

C1348

Different Diameter Tire Malfunction

216

Large difference between front and rear tire revolution when driving straight ahead at a constant speed of 30 km/h or higher

  • Incorrect tire size
  • Tire air pressure not adjusted correctly
  • Speed sensor system
  • Hybrid vehicle control ECU

HINT:

Destination ECU: Hybrid vehicle control ECU

PROCEDURE

1.

CHECK TIRE SIZE

(a) Check the tire sizes to ensure that the front and rear tire sizes are not different.

Click here

HINT:

If different tire sizes are discovered, replace the tires so that the tire sizes are the same on all 4 wheels.

(b) Adjust the air pressure in the tires.

Click here

NEXT

2.

RECONFIRM DTC

(a) Clear the DTCs.

Click here

Powertrain > Hybrid Control > Clear DTCs

(b) Turn the power switch off.

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

(d) Drive the vehicle at a constant speed of 30 km/h or higher for several minutes.

(e) Check if the same DTC is output.

Click here

Powertrain > Hybrid Control > Trouble Codes

(f) Check that no electronically controlled brake system speed sensor DTCs are output.

Click here

Chassis > ABS/VSC/TRAC > Trouble Codes

HINT:

  • If C1348 and electronically controlled brake system DTCs are output simultaneously, check and repair the trouble areas in the electronically controlled brake system.

    Click here

  • When a DTC has been stored, the vehicle condition when the DTC was stored can be determined from the freeze frame data.

    Hybrid Control System: Click here

    Electronically Controlled Brake System: Click here

Result

Proceed to

DTCs not output

A

Electronically controlled brake system speed sensor DTCs are output

B

Only C1348 is output

C

A

USE SIMULATION METHOD TO CHECK

B

REPAIR CIRCUITS INDICATED BY OUTPUT DTCS

C

REPLACE HYBRID VEHICLE CONTROL ECU

READ NEXT:

 Accumulator Pressure Sensor (C1365)

DESCRIPTION The accumulator pressure sensor is built into the brake actuator (brake booster with master cylinder assembly). The skid control ECU (brake booster with master cylinder assembly) detects t

 Stop Light Relay Malfunction (C1380)

DESCRIPTION Upon receiving the hill-start assist control, dynamic radar cruise control, brake hold control or trailer sway control operating signal from the skid control ECU (brake booster with master

 Abnormal Power Supply Voltage in Yaw Rate and/or Deceleration Sensor (C1381)

DESCRIPTION This DTC is stored when the skid control ECU (brake booster with master cylinder assembly) receives a sensor supply voltage malfunction signal from the yaw rate and acceleration sensor (ai

SEE MORE:

 System Description

SYSTEM DESCRIPTION The power steering system generates torque through the operation of the motor and the reduction gear installed on the column shaft in order to assist steering effort. The power steering ECU assembly determines the direction and the amount of assist power in accordance with ve

 Vehicle Identification Malfunction (C1789)

DESCRIPTION When the absorber control ECU has not acquired the vehicle identification information, DTC C1789 is stored. When the vehicle identification information is correctly acquired, this DTC is cleared. Vehicle identification information is automatically acquired when the system enters test

© 2016-2025 Copyright www.lexunx.com