Lexus RX (RX 350L, RX450h) 2016-2022 Repair Manual: ABS Malfunction (C1296)

DESCRIPTION

If a malfunction in the speed sensor signal circuit or acceleration sensor (airbag sensor assembly*1 or yaw rate sensor assembly*2) circuit is detected, the 4WD ECU assembly stores this DTC.

The airbag sensor assembly has a built-in acceleration sensor.*1

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

C1296

ABS Malfunction

When one of the following conditions is met:

  • A wheel speed sensor malfunction is received from the skid control ECU (brake actuator assembly)
  • An acceleration sensor (airbag sensor assembly*1 or yaw rate sensor assembly*2) malfunction is received from skid control ECU (brake actuator assembly)
  • Vehicle stability control system (Speed sensor circuit)
  • Skid control ECU (Brake actuator assembly)
  • Acceleration sensor (airbag sensor assembly) circuit*1
  • Acceleration sensor (yaw rate sensor assembly) circuit*2
  • 4WD ECU assembly
  • *1: w/ Optitron Meter Type
  • *2: w/ TFT Meter Type

WIRING DIAGRAM

Refer to DTC C1337.

Click here

CAUTION / NOTICE / HINT

NOTICE:

When the 4WD ECU assembly is replaced with a known good one from another vehicle, it is necessary to perform calibration.

Click here

HINT:

Check the condition of each related circuit connector before troubleshooting.

Click here

PROCEDURE

1.

CHECK FOR DTC (VEHICLE STABILITY CONTROL SYSTEM)

(a) Clear the DTCs.

Chassis > Brake/EPB > Clear DTCs

(b) Turn the engine switch off.

(c) Drive the vehicle, accelerate to a speed of 20 km/h (12 mph) or more, and check if any DTCs related to a speed sensor or acceleration sensor are output.

Chassis > Brake/EPB > Trouble Codes

Result

Proceed to

Vehicle stability control system DTC (speed sensor or acceleration sensor DTC) is not output

A

Vehicle stability control system DTC (speed sensor or acceleration sensor DTC) is output

B

B

REPAIR CIRCUIT INDICATED BY OUTPUT CODE (VEHICLE STABILITY CONTROL SYSTEM)

A

2.

READ VALUE USING TECHSTREAM (WHEEL SPEED)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Chassis / Four Wheel Drive / Data List.

(e) Read the value displayed on the Techstream.

Chassis > Four Wheel Drive > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

FR Wheel Speed

Front wheel speed sensor RH reading

Min.: 0 km/h (0 mph)

Max.: 326 km/h (202 mph)

Vehicle stopped: 0 km/h (0 mph)

No large fluctuations when driving at a constant speed.

FL Wheel Speed

Front wheel speed sensor LH reading

Min.: 0 km/h (0 mph)

Max.: 326 km/h (202 mph)

Vehicle stopped: 0 km/h (0 mph)

No large fluctuations when driving at a constant speed.

RR Wheel Speed

Rear wheel speed sensor RH reading

Min.: 0 km/h (0 mph)

Max.: 326 km/h (202 mph)

Vehicle stopped: 0 km/h (0 mph)

No large fluctuations when driving at a constant speed.

RL Wheel Speed

Rear wheel speed sensor LH reading

Min.: 0 km/h (0 mph)

Max.: 326 km/h (202 mph)

Vehicle stopped: 0 km/h (0 mph)

No large fluctuations when driving at a constant speed.

Chassis > Four Wheel Drive > Data List

Tester Display

FR Wheel Speed

FL Wheel Speed

RR Wheel Speed

RL Wheel Speed

OK:

The speed value output from the speed sensor displayed on the Techstream is the same as the actual vehicle speed measured using a speedometer tester (calibrated chassis dynamometer).

NG

GO TO VEHICLE STABILITY CONTROL SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING)

OK

3.

READ VALUE USING TECHSTREAM (FORWARD AND REARWARD G)

(a) Enter the following menus: Chassis / Four Wheel Drive / Data List.

(b) Read the value displayed on the Techstream.

Chassis > Four Wheel Drive > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Forward and Rearward G

Forward and Rearward G

Min.: -25.10 m/s2

Max.: 24.90 m/s2

During acceleration/deceleration: Changes in accordance with acceleration

-

Chassis > Four Wheel Drive > Data List

Tester Display

Forward and Rearward G

OK:

The acceleration sensor (airbag ECU assembly*1 or yaw rate sensor assembly*2) output value is normal.

  • *1: w/ Optitron Meter Type
  • *2: w/ TFT Meter Type
OK

REPLACE 4WD ECU ASSEMBLY

NG

GO TO VEHICLE STABILITY CONTROL SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING)

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