Toyota Avalon Service & Repair Manual: Check For Intermittent Problems

Toyota Avalon 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.

(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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Toyota Avalon Service & Repair Manual: Check For Intermittent Problems

Calibration

Data List / Active Test

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