Check For Intermittent Problems
WARNING: This page is about a different car, the 2009 Toyota Corolla. 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 using the ECU Data List function of the Techstream.
- Turn the ignition switch off.
- Connect the Techstream to the DLC3.
- Turn the ignition switch to ON.
- Turn the Techstream on.
- 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 to ON (initial check).
- If the status remains on (ERROR displayed), 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 changed from momentary interruption (open circuit) to normal condition.
ABS/VSC/TRAC
ABS/VSC/TRAC REFERENCE CHARTTester 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:
NORMAL display appears.
HINT:
The connector and/or wire harness has a momentary interruption (open circuit) if the display changes. Repair or replace the connector and/or wire harness as one of them is faulty.