Check For Intermittent Problems
WARNING: This page is about a different car, the 2008 Toyota Yaris. 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 by using the ECU data list function of a Techstream.
- Turn the ignition switch off and connect the Techstream to the DLC3.
- Turn the ignition switch to ON.
- Follow the prompts on the Techstream to display the Data List and select areas where a 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 the status remains on the ERROR display, check for continuity between the ECU and the sensors, or between ECUs.
- The ERROR display on the Techstream remains on for 1 second after the harness signal changes from a momentary interruption (open circuit) to normal condition.
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
DATA LIST REFERENCETester Display Measurement Item/Range Normal Condition Diagnostic Note FR Speed Open FR speed sensor open detection / ERROR or NORMAL ERROR: Momentary interruption
NORMAL: Normal- FL Speed Open FL speed sensor open detection / ERROR or NORMAL ERROR: Momentary interruption
NORMAL: Normal- RR Speed Open RR speed sensor open detection / ERROR or NORMAL ERROR: Momentary interruption
NORMAL: Normal- RL Speed Open RL speed sensor open detection / ERROR or NORMAL ERROR: Momentary interruption
NORMAL: Normal-
- While observing the screen, gently jiggle the connector or wire harness between the ECU and sensors, or between ECUs.
OK:
Display does not change.
HINT:
The connector and/or wire harness have a momentary interruption (open circuit) if the display changes. Repair or replace the connector and wire harness if either of them is faulty.