Toyota Yaris: 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.
| 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.
How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT HINT: *: Use the GTS. PROCEDURE 1. VEHICLE BROUGHT TO WORKSHOP
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Front Seat Belt Pretensioners
The front seat belt pretensioners are designed to deploy in moderate or severe frontal, near frontal collisions.
In addition, the pretensioners operate when a side collision or a rollover accident is detected. The pretensioners operate differently depending on what types of air bags are equipped. For more details about the seat belt pretensioner operation, refer to the SRS Air Bag Deployment Criteria.
