Last Modified: 04-05-2023 6.11:8.1.0 Doc ID: RM1000000018KDV
Model Year Start: 2018 Model: Sienna Prod Date Range: [11/2017 -           ]
Title: BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: CHECK FOR INTERMITTENT PROBLEMS; 2018 - 2020 MY Sienna [11/2017 -        ]

CHECK FOR INTERMITTENT PROBLEMS

1. 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 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 interruption should be monitored.

HINT:

  • A momentary interruption (open circuit) cannot be detected for 3 seconds after the ignition switch turned to ON (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.

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

ECM 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

-

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

-

Master Cylinder Pressure Sensor Power Supply Open

Master cylinder pressure sensor power supply voltage status / Error or Normal

Error: Momentary interruption

Normal: Normal

-

Solenoid Power Supply Open

Solenoid power supply voltage status / Error or Normal

Error: Momentary interruption

Normal: Normal

-

Motor Power Supply Open

Motor power supply voltage status / Error or Normal

Error: Momentary interruption

Normal: Normal

-

Stop Switch Open

Momentary interruption (open circuit) status in wire harness between skid control ECU (brake actuator assembly) and stop light switch assembly status / Error or Normal

Error: Momentary interruption

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.