Toyota Avalon Service & Repair Manual: Check For Intermittent Problems

CHECK FOR INTERMITTENT PROBLEMS

CHECK FOR INTERMITTENT PROBLEMS

HINT:

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

(a) Turn the engine switch off.

(b) Connect the Techstream to the DLC3.

(c) Turn the engine 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 interruption should be monitored.

HINT:

  • A momentary interruption (open circuit) cannot be detected for 3 seconds after the engine 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/EPB > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

EFI Communication Open

EFI communication 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

-

IG Voltage Value Decreased

+BS voltage value decrease detection

Error or Normal

Error: Voltage low

Normal: Normal

-

IG Voltage Value Increased

+BS voltage value increase detection

Error or Normal

Error: Voltage high

Normal: Normal

-

(f) While observing the screen, gently jiggle the connector or wire harness between the ECU 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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