Check For Intermittent Problems

HINT: 

A momentary interruption (open circuit) in the connectors and/or wire harnesses between the sensors and ECUs can be detected using the ECU Data List function of the Techstream.

1. Turn the ignition switch off.
2. Connect the Techstream to the DLC3.
3. Turn the ignition switch to ON.
4. Turn the Techstream on.
5. Follow the directions on the Techstream to display the Data List and select areas where momentary interruptions 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 Error remains displayed, check for continuity between the ECUs and the sensors, or between ECUs.
   • Error will remain displayed on the Techstream for 1 second after the harness signal changes from a momentary interruption (open circuit) 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	Normal	-
   FL Speed Open	Front speed sensor LH open detection / Error or Normal	Normal	-
   RR Speed Open	Rear speed sensor RH open detection / Error or Normal	Normal	-
   RL Speed Open	Rear speed sensor LH open detection / Error or Normal	Normal	-
   EFI Communication Open	EFI communication open detection / Error or Normal	Normal	-
   Yaw Rate Open	Yaw rate sensor open detection / Error or Normal	Normal	-
   Deceleration Open	Acceleration sensor open detection / Error or Normal	Normal	-
   Steering Open	Steering angle sensor open detection / Error or Normal	Normal	-
   Master Cylinder Open	Master cylinder pressure sensor open detection / Error or Normal	Normal	-
   IG Voltage Value Decreased	IG voltage value decrease detection / Error or Normal	Normal	-
   IG Voltage Value Increased	IG voltage value increase detection / Error or Normal	Normal	-
   FR Speed Sensor Voltage Open	Front speed sensor RH voltage open detection / Error or Normal	Normal	-
   FL Speed Sensor Voltage Open	Front speed sensor LH voltage open detection / Error or Normal	Normal	-
   RR Speed Sensor Voltage Open	Rear speed sensor RH voltage open detection / Error or Normal	Normal	-
   RL Speed Sensor Voltage Open	Rear speed sensor LH voltage open detection / Error or Normal	Normal	-
   M/C Pressure Sensor Noise	Master cylinder pressure sensor noise detection / Error or Normal	Normal	-
   Yaw Rate Sensor Voltage Open	Yaw rate sensor voltage open detection / Error or Normal	Normal	-
   EFI Communication Invalid	EFI communication invalid detection / Error or Normal	Normal	-

6. While observing the screen, gently jiggle the connectors or wire harnesses between the ECUs and sensors or between ECUs.

   OK

   Normal is displayed.

   HINT: 

   The connector and/or wire harness has a momentary interruption (open circuit) if the display changes. Repair or replace the connectors and/or wire harnesses as one of them is faulty.