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 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.
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
ABS/VSC/TRAC
ABS/VSC/TRAC DATA LISTTester 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.