Last Modified: 04-05-2023 6.11:8.1.0 Doc ID: RM100000000VIVE
Model Year Start: 2016 Model: Sienna Prod Date Range: [12/2015 - 11/2017]
Title: BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: CHECK FOR INTERMITTENT PROBLEMS; 2016 - 2017 MY Sienna [12/2015 - 11/2017]

CHECK FOR INTERMITTENT PROBLEMS

1. 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 ECU Data List function of the Techstream.

(a) Turn the ignition switch off.

(b) Connect the Techstream to the DLC3.

(c) Turn the ignition switch to ON.

(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 ignition switch is turned to ON (initial check).
  • If the Error display remains displayed, check for continuity between the ECUs and the sensors, or between ECUs.
  • The Error display on the Techstream will remain displayed for 1 second after the harness signal changes from momentary interruption (open circuit) to normal condition.

ABS/VSC/TRAC

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

-

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

-

Master Cylinder Open

Master cylinder pressure sensor open detection /

Error or Normal

Error: Momentary interruption

Normal: Normal

-

IG Voltage Value Decreased

IG1 voltage value decrease detection /

Error or Normal

Error: Voltage low

Normal: Normal

-

IG Voltage Value Increased

IG1 voltage value increase detection /

Error or Normal

Error: Voltage high

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

-

M/C Pressure Sensor Noise

Master cylinder pressure sensor noise detection /

Error or Normal

Error: Malfunction

Normal: Normal

-

Brake Pedal Switch Open

Brake pedal load sensing switch 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

-

EFI Communication Invalid

ECM communication invalid detection /

Error or Normal

Error: Invalid

Normal: Normal

-

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

OK:

Normal display appears.

HINT:

The connector and/or wire harness has a momentary interruption (open circuit) if the display changes. Repair or replace the connectors and/or wire harnesses as one of them is faulty.