Toyota Avalon (XX50): Diagnosis System. Diagnostic Trouble Code Chart. Dtc Check / Clear

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual / Brake / Brake Control / Dynamic Control Systems / Electronically Controlled Brake System(for Gasoline Model) / Diagnosis System. Diagnostic Trouble Code Chart. Dtc Check / Clear

Diagnosis System

DIAGNOSIS SYSTEM

DESCRIPTION

When troubleshooting a vehicle with a diagnosis system, the only difference from the usual troubleshooting procedure is connecting the Techstream to the vehicle and reading various data output from the skid control ECU (brake actuator assembly).

The skid control ECU (brake actuator assembly) records DTCs when it detects a malfunction in itself or in its circuits.

To check for DTCs, connect the Techstream to the DLC3 on the vehicle. The Techstream can be used to clear the DTCs, activate various actuators, and check the Freeze Frame Data and Data List.

(a) Check the battery voltage.

Standard Voltage:

11 to 14 V

If the voltage is below 11 V, recharge the battery before proceeding to the next step.

(b) Check the DLC3.

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DIAGNOSIS

(a) If a malfunction occurs in one part of the system, the skid control ECU (brake actuator assembly) illuminates the warning light corresponding to the malfunctioning system (ABS warning light, brake system warning light (red indicator) or slip indicator light).

(b) If a DTC is stored by the skid control ECU (brake actuator assembly) and the following conditions are met when the brake hold switch (electric parking brake switch assembly) is pressed, the brake hold operated indicator light blinks.

Vehicle Conditions:
1. The driver door is closed.
2. The driver seat belt is fastened.

The DTCs can be read by connecting the Techstream.

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(d) This system has a Test Mode (Signal Check) function.

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WARNING LIGHT AND INDICATOR LIGHT INITIAL CHECK

(a) When the engine switch is turned on (IG), check that the ABS warning light, brake system warning light (red indicator), VSC OFF indicator light, brake hold standby indicator light, brake hold operated indicator light and slip indicator light come on for approximately 3 seconds.

HINT:

When the brake fluid level is low or the vacuum inside the brake booster decreases, the brake system warning light (red indicator) comes on.
If the warning light and indicator light check result is not normal, proceed to troubleshooting for the ABS warning light, brake system warning light (red indicator), VSC OFF indicator light, slip indicator light, brake hold standby indicator light and brake hold operated indicator light circuits.
If any of the indicators remains on or does not come on, proceed to troubleshooting for the light circuits listed below.

Trouble Area	See Procedure
ABS warning light circuit (Remains on)
ABS warning light circuit (Does not come on)
Brake system warning light (red indicator) circuit (Remains on)
Brake system warning light (red indicator) circuit (Does not come on)
VSC OFF indicator light circuit (Remains on)
VSC OFF indicator light circuit (Does not come on)
Slip indicator light circuit (Remains on)
Slip indicator light circuit (Does not come on)
Brake hold standby indicator light circuit
Brake hold operated indicator light circuit

Diagnostic Trouble Code Chart

DIAGNOSTIC TROUBLE CODE CHART

Vehicle Stability Control System

DTC No.	Detection Item	Link
C1201	Engine Control System Malfunction
C1224	NE Signal Circuit
C1225	SA1 Solenoid Circuit
C1226	SA2 Solenoid Circuit
C1227	SA3 Solenoid Circuit
C1228	STR Solenoid Circuit
C1231	Steering Angle Sensor Circuit
C1234	Yaw Rate Sensor
C1237	Speed Sensor Rotor Faulty
C1241	Low or High Power Supply Voltage
C1246	Master Cylinder Pressure Sensor
C1249	Open Circuit in Stop Light Switch Circuit
C1288	Error in Matching of ECUs
C1300	Skid Control ECU Malfunction
C1330	Open Circuit in Right Front Speed Sensor Circuit
C1331	Open Circuit in Left Front Speed Sensor Circuit
C1332	Open Circuit in Right Rear Speed Sensor Circuit
C1333	Open Circuit in Left Rear Speed Sensor Circuit
C1336	Zero Point Calibration of Deceleration Sensor undone
C1380	Stop Light Relay Malfunction
C1381	Abnormal Power Supply Voltage in Yaw Rate and/or Deceleration Sensor
C1417	IG1 Voltage Supply too High
C1419	Deceleration Sensor Internal Circuit
C1420	Malfunction in Deceleration Sensor
C1425	Open in Stop Light Switch Circuit
C1426	Stop Switch OFF Stuck
C1428	Motor Circuit
C1432	Steering Angle Sensor Power Source Voltage
C1433	Steering Angle Sensor Internal Circuit
C1434	Steering Angle Sensor Output
C1435	Yaw Rate Sensor Internal Circuit
C1436	Malfunction in Yaw Rate Sensor
C1439	Steering Angle Sensor Initialization Incomplete
C1445	Vehicle Driven with Steering Angle Sensor not Initialized
C1448	Yaw Rate Sensor Output Value Malfunction
C1464	Front Speed Sensor RH Circuit
C1465	Front Speed Sensor LH Circuit
C1466	Rear Speed Sensor RH Circuit
C1467	Rear Speed Sensor LH Circuit
C1468	SFR Solenoid Circuit
C1469	SFL Solenoid Circuit
C146A	SRR Solenoid Circuit
C146B	SRL Solenoid Circuit
C146C	Open Circuit in ABS Motor Relay Circuit
C146E	Open Circuit in ABS Solenoid Relay Circuit
C1472	Deceleration Sensor
C1474	Forward and Rearward G Sensor
C147D	Air Bag Circuit
U0073	Control Module Communication Bus Off
U0100	Lost Communication With ECM/PCM "A"
U0123	Lost Communication With Yaw Rate Sensor Module
U0126	Lost Communication With Steering Angle Sensor Module
U0142	Lost Communication with Body Control Module "B"
U0151	Lost Communication With Restraints Control Module

Dtc Check / Clear

DTC CHECK / CLEAR

DTC CHECK/CLEAR (When Using TECHSTREAM)

(a) Check for DTCs.

(1) Turn the engine switch off.

(2) Connect the Techstream to the DLC3.

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

(4) Turn the Techstream on.

(5) Read the DTCs following the prompts on the Techstream. Enter the following menus: Chassis / ABS/VSC/TRAC/EPB / Trouble Codes.

Chassis > ABS/VSC/TRAC/EPB > Trouble Codes

(6) Check the details of the DTCs.

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NOTICE:

The vehicle stability control system outputs DTCs for the following system. When DTCs other than those in Diagnostic Trouble Code Chart for the vehicle stability control system are output, refer to Diagnostic Trouble Code Chart for the relevant system.

System	Proceed to
Electric Parking Brake System

(b) Clear the DTCs.

(1) Turn the engine switch off.

(2) Connect the Techstream to the DLC3.

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

(4) Turn the Techstream on.

(5) Operate the Techstream to clear the codes. Enter the following menus: Chassis / ABS/VSC/TRAC/EPB / Trouble Codes.

Chassis > ABS/VSC/TRAC/EPB > Clear DTCs

(6) Press the DTC clear button.

END OF DTC CHECK/CLEAR

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

(b) Check that the ABS warning, slip indicator and brake hold operated indicator* lights go off within approximately 3 seconds of turning the engine switch on (IG).

*: The brake hold switch (electric parking brake switch assembly) is pressed under the following vehicle conditions.

Vehicle Conditions:
1. The driver door is closed.
2. The driver seat belt is fastened.

Data List / Active Test

Excessive Brake Pedal Travel (No Fluid Leaks and No Air in System). Fail-safe Chart. Freeze Frame Data

See More:

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