Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: Check For Intermittent Problems

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual / Brake / Brake Control / Dynamic Control Systems / Electronically Controlled Brake System(for Hv Model) / Check For Intermittent Problems

CHECK FOR INTERMITTENT PROBLEMS

CHECK FOR INTERMITTENT PROBLEMS

HINT:

A momentary interruption (open circuit) in the connectors and/or wire harnesses between the sensors and ECUs can be detected using the Data List function of the Techstream.

(a) Turn the power switch off.

(b) Connect the Techstream to the DLC3.

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

(d) Turn the Techstream on.

(e) Follow the directions on the Techstream to display the Data List and select areas where momentary interruptions should be monitored.

HINT:

  • A momentary interruption (open circuit) cannot be detected for 3 seconds after the power switch is turned on (IG) (initial check).
  • If Error remains displayed for one of the items on the Techstream, check for continuity between the ECU and the item for which Error is displayed.
  • If a momentary interruption occurs and Error is displayed on the Techstream, Error will remain displayed on the Techstream for 1 second after the circuit returns to normal.
Chassis > ABS/VSC/TRAC > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

FR Speed Open

Front speed sensor RH open detection

Error or Normal

Error: Momentary interruption

Normal: Normal

-

FL Speed Open

Front speed sensor LH open detection

Error or Normal

Error: Momentary interruption

Normal: Normal

-

RR Speed Open

Rear speed sensor RH open detection

Error or Normal

Error: Momentary interruption

Normal: Normal

-

RL Speed Open

Rear speed sensor LH open detection

Error or Normal

Error: Momentary interruption

Normal: Normal

-

Yaw Rate Open

Yaw rate sensor open detection

Error or Normal

Error: Momentary interruption

Normal: Normal

-

Deceleration Open

Acceleration sensor open detection

Error or Normal

Error: Momentary interruption

Normal: Normal

-

Steering Open

Steering angle sensor open detection

Error or Normal

Error: Momentary interruption

Normal: Normal

-

Stroke Open

Brake pedal stroke sensor open detection

Error or Normal

Error: Momentary interruption

Normal: Normal

-

Stroke2 Open

Brake pedal stroke sensor 2 open detection

Error or Normal

Error: Momentary interruption

Normal: Normal

-

Accumulator Open

Accumulator pressure sensor open detection

Error or Normal

Error: Momentary interruption

Normal: Normal

-

HV Communication Open

Hybrid vehicle communication open detection

Error or Normal

Error: Momentary interruption

Normal: Normal

-

FR Speed Sensor Voltage Open

Front speed sensor RH voltage open detection

Error or Normal

Error: Momentary interruption

Normal: Normal

-

FL Speed Sensor Voltage Open

Front speed sensor LH voltage open detection

Error or Normal

Error: Momentary interruption

Normal: Normal

-

RR Speed Sensor Voltage Open

Rear speed sensor RH voltage open detection

Error or Normal

Error: Momentary interruption

Normal: Normal

-

RL Speed Sensor Voltage Open

Rear speed sensor LH voltage open detection

Error or Normal

Error: Momentary interruption

Normal: Normal

-

Yaw Rate Sensor Voltage Open

Yaw rate sensor voltage open detection

Error or Normal

Error: Momentary interruption

Normal: Normal

-

Reaction Force Pressure Sensor Open

Reaction force pressure sensor open detection

Error or Normal

Error: Momentary interruption

Normal: Normal

-

Servo Pressure Sensor Open

Servo pressure sensor open detection

Error or Normal

Error: Momentary interruption

Normal: Normal

-

Air Bag ECU Communication Open

Airbag ECU assembly communication open detection

Error or Normal

Error: Momentary interruption

Normal: Normal

-

(f) While observing the screen, gently jiggle the connectors or wire harnesses between the ECUs and sensors, or between ECUs.

OK:

Normal is displayed.

HINT:

If the display changes, this indicates that there has been a momentary interruption (open circuit) in the connector and/or wire harness. In this case, repair or replace the connectors and/or wire harnesses as one of them is faulty.

    Calibration

    Data List / Active Test

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