Toyota Yaris: Vehicle Stability Control System / Check For Intermittent Problems

Toyota Yaris XP210 (2020-2022) Reapir and Service Manual / Brake / Brake Control / Dynamic Control Systems / Vehicle Stability Control System / 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 GTS.

(a) Follow the directions on the GTS 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 is turned to ON (initial check).
  • If Under intermittent remains displayed for one of the items on the GTS, check for continuity between the ECU and the item for which Under intermittent is displayed.
  • If a momentary interruption occurs and Under intermittent is displayed on the GTS, Under intermittent will remain displayed on the GTS for 1 second after the circuit returns to normal.
Chassis > Brake > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

FR Speed Open

Front speed sensor RH open detection

Under intermittent / Normal

Under intermittent: Momentary interruption detected

Normal: Momentary interruption not detected

-

FL Speed Open

Front speed sensor LH open detection

Under intermittent / Normal

Under intermittent: Momentary interruption detected

Normal: Momentary interruption not detected

-

RR Speed Open

Rear speed sensor RH open detection

Under intermittent / Normal

Under intermittent: Momentary interruption detected

Normal: Momentary interruption not detected

-

RL Speed Open

Rear speed sensor LH open detection

Under intermittent / Normal

Under intermittent: Momentary interruption detected

Normal: Momentary interruption not detected

-

EFI Communication Open

ECM communication open detection

Under intermittent / Normal

Under intermittent: ECM communication invalid state detected

Normal: ECM communication invalid state not detected

-

Yaw Rate Open

Yaw rate sensor open detection

Under intermittent / Normal

Under intermittent: Momentary interruption detected

Normal: Momentary interruption not detected

-

Deceleration Open

Acceleration sensor open detection

Under intermittent / Normal

Under intermittent: Momentary interruption detected

Normal: Momentary interruption not detected

-

Steering Open

Steering sensor open detection

Under intermittent / Normal

Under intermittent: Momentary interruption detected

Normal: Momentary interruption not detected

-

Master Cylinder Open

Master cylinder pressure sensor open detection

Under intermittent / Normal

Under intermittent: Momentary interruption detected

Normal: Momentary interruption not detected

-

FR Speed Sensor Voltage Open

Front speed sensor RH voltage open detection

Under intermittent / Normal

Under intermittent: Momentary interruption detected

Normal: Momentary interruption not detected

-

FL Speed Sensor Voltage Open

Front speed sensor LH voltage open detection

Under intermittent / Normal

Under intermittent / Normal

Under intermittent: Momentary interruption detected

Normal: Momentary interruption not detected

-

RR Speed Sensor Voltage Open

Rear speed sensor RH voltage open detection

Under intermittent / Normal

Under intermittent: Momentary interruption detected

Normal: Momentary interruption not detected

-

RL Speed Sensor Voltage Open

Rear speed sensor LH voltage open detection

Under intermittent / Normal

Under intermittent: Momentary interruption detected

Normal: Momentary interruption not detected

-

Yaw Rate Sensor Voltage Open

Yaw rate sensor voltage open detection

Under intermittent / Normal

Under intermittent: Momentary interruption detected

Normal: Momentary interruption not detected

-

Master Cylinder Pressure Sensor Power Supply Open

Master cylinder pressure sensor power supply voltage status

Under intermittent / Normal

Under intermittent: Momentary interruption detected

Normal: Momentary interruption not detected

-

Solenoid Power Supply Open

Solenoid power supply voltage status

Under intermittent / Normal

Under intermittent: Momentary interruption detected

Normal: Momentary interruption not detected

-

Motor Power Supply Open

Motor power supply voltage status

Under intermittent / Normal

Under intermittent: Momentary interruption detected

Normal: Momentary interruption not detected

-

Stop Switch Open

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

Under intermittent / Normal

Under intermittent: Momentary interruption detected

Normal: Momentary interruption not detected

-

Air Bag ECU Communication Open

Airbag sensor assembly open detection

Under intermittent / Normal

Under intermittent: Momentary interruption detected

Normal: Momentary interruption not detected

-

(b) Select the line graph display.

(c) Using the line graph, check whether the status is "Under intermittent" or "Normal".

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.

(d) While observing the screen, gently jiggle the connector or wire harness between the ECU and each sensors, or between ECUs.

OK:

Normal is displayed.

HINT:

  • If a momentary interruption occurs and Under intermittent is displayed on the GTS, Under intermittent will remain displayed on the GTS for 1 second after the circuit returns to normal.
  • 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.

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