| 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.
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