Check For Intermittent Problems [02/2019 - 12/2021]

HINT: 

A momentary interruption (open circuit) in the connectors and/or wire harnesses between the sensors and ECUs can be detected using the 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 for one of the items on the Techstream, check for continuity between the ECU and the item for which Error is displayed.
   • If a momentary interruption occurs and Error is displayed on the Techstream, Error will remain displayed on the Techstream for 1 second after the circuit returns to normal.

   Chassis > ABS/VSC/TRAC > Data List 

   Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
   FR Speed Open	Front speed sensor RH open detection	Error or Normal	Error: Momentary interruption detected Normal: Momentary interruption not detected	After a momentary interruption occurs, if there is no momentary interruption for 1 second, it switches from "Error" to "Normal". Related DTC: C1464
   FL Speed Open	Front speed sensor LH open detection	Error or Normal	Error: Momentary interruption detected Normal: Momentary interruption not detected	After a momentary interruption occurs, if there is no momentary interruption for 1 second, it switches from "Error" to "Normal". Related DTC: C1465
   RR Speed Open	Rear speed sensor RH open detection	Error or Normal	Normal: Momentary interruption not detected Normal: Momentary interruption not detected	After a momentary interruption occurs, if there is no momentary interruption for 1 second, it switches from "Error" to "Normal". Related DTC: C1466
   RL Speed Open	Rear speed sensor LH open detection	Error or Normal	Error: Momentary interruption detected Normal: Momentary interruption not detected	After a momentary interruption occurs, if there is no momentary interruption for 1 second, it switches from "Error" to "Normal". Related DTC: C1467
   Yaw Rate Open	Yaw rate sensor open detection	Error or Normal	Error: Momentary interruption detected Normal: Momentary interruption not detected	After a momentary interruption occurs, if there is no momentary interruption for 1 second, it switches from "Error" to "Normal". Related DTC: U0123
   Deceleration Open	Acceleration sensor open detection	Error or Normal	Error: Momentary interruption detected Normal: Momentary interruption not detected	After a momentary interruption occurs, if there is no momentary interruption for 1 second, it switches from "Error" to "Normal". Related DTC: U0124
   Steering Open	Steering sensor open detection	Error or Normal	Error: Momentary interruption detected Normal: Momentary interruption not detected	After a momentary interruption occurs, if there is no momentary interruption for 1 second, it switches from "Error" to "Normal". Related DTC: U0126
   Master Cylinder Open	Regulator pressure sensor open detection	Error or Normal	Error: Momentary interruption detected Normal: Momentary interruption not detected	After a momentary interruption occurs, if there is no momentary interruption for 1 second, it switches from "Error" to "Normal". Related DTC: C1246
   Stroke Open	Brake pedal stroke sensor assembly open detection	Error or Normal	Error: Momentary interruption detected Normal: Momentary interruption not detected	After a momentary interruption occurs, if there is no momentary interruption for 1 second, it switches from "Error" to "Normal". Related DTC: C1247
   FR Wheel Cylinder Open	Wheel cylinder pressure sensor open detection	Error or Normal	Error: Momentary interruption detected Normal: Momentary interruption not detected	After a momentary interruption occurs, if there is no momentary interruption for 1 second, it switches from "Error" to "Normal". Related DTC: C1364
   Accumulator Open	Accumulator pressure sensor open detection	Error or Normal	Error: Momentary interruption detected Normal: Momentary interruption not detected	After a momentary interruption occurs, if there is no momentary interruption for 1 second, it switches from "Error" to "Normal". Related DTC: C1365
   HV Communication Open	Hybrid vehicle communication open detection	Error or Normal	Error: Hybrid vehicle control ECU assembly communication invalid state detected Normal: Hybrid vehicle control ECU assembly communication invalid state not detected	After hybrid vehicle control ECU assembly communication invalid state occurs, if there no further invalid state occurs, it switches from "Error" to "Normal". Related DTC: U0293
   Air Bag ECU Communication Open	Airbag ECU assembly communication open detection	Error or Normal	Error: Momentary interruption detected Normal: Momentary interruption not detected	After a momentary interruption occurs, if there is no momentary interruption for 1 second, it switches from "Error" to "Normal". Related DTC: U0151

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: 

   If the display changes, this indicates that there has been a momentary interruption (open circuit) in the connector and/or wire harness. In this case, repair or replace the connectors and/or wire harnesses as one of them is faulty.