Check For Intermittent Problems
WARNING: This page is about a different car, the 2011 Toyota Avalon. However, it is still accessible from the selected car via links, so may be relevant.
- 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 in the ECU data list function of the Techstream.
- Turn the ignition switch off and connect the Techstream to the DLC3.
- Turn the ignition switch on (IG). 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 is turned on (IG) (initial check).
Tester Display Measurement Item/Range Normal Condition Diagnostic Note FR Speed Open FR speed sensor open detection / OPN DET or NORMAL OPN DET: Momentary interruption
NORMAL: Normal- FL Speed Open FL speed sensor open detection / OPN DET or NORMAL OPN DET: Momentary interruption
NORMAL: Normal- RR Speed Open RR speed sensor open detection / OPN DET or NORMAL OPN DET: Momentary interruption
NORMAL: Normal- RL Speed Open RL speed sensor open detection / OPN DET or NORMAL OPN DET: Momentary interruption
NORMAL: Normal- EFI Open EFI communication open detection / OPN DET or NORMAL OPN DET: Momentary interruption
NORMAL: Normal- Yaw Rate Open Yaw rate sensor open detection / OPN DET or NORMAL OPN DET: Momentary interruption
NORMAL: Normal- Deceleration Open G sensor open detection / OPN DET or NORMAL OPN DET: Momentary interruption
NORMAL: Normal- Steering Open Steering angle sensor open detection / OPN DET or NORMAL OPN DET: Momentary interruption
NORMAL: Normal- Master Cylinder 1 Open Master Cylinder pressure sensor 1 open detection / OPN DET or NORMAL OPN DET: Momentary interruption
NORMAL: Normal- - Harness Signal.
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
HINT:
- If the status remains on (OPN DET displayed), check the continuity between the ECU and the sensors, or between ECUs.
- The OPN DET display on Techstream remains on for 1 second after the harness signal changes from momentary interruption (open circuit) to normal condition.
- While observing the screen, gently jiggle the connector or wire harness between the ECU and sensors, or between ECUs.
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Result
OPN DET display does not change.
HINT:
The connector and/or wire harness will be in momentary interruption (open circuit) if the display changes. Repair or replace connector and/or wire harness as one of them is faulty.