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 by using the ECU Data List function of the 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.
ABS/VSC/TRAC:Tester 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- EFI Communication Open EFI communication open detection / Error or Normal Error: Momentary interruption
Normal: Normal- Yaw Rate Open Yaw rate sensor open detection / Error or Normal Error: Momentary interruption
Normal: Normal- Deceleration Open Deceleration sensor open detection / Error or Normal Error: Momentary interruption
Normal: Normal- Steering Open Steering angle sensor open detection / Error or Normal Error: Momentary interruption
Normal: Normal- Master Cylinder Open Master cylinder pressure sensor open detection / Error or Normal Error: Momentary interruption
Normal: Normal- IG Voltage Value Decreased IG voltage value decrease detection / Error or Normal Error: Momentary interruption
Normal: Normal- IG Voltage Value Increased IG voltage value increase detection / Error or Normal Error: Momentary interruption
Normal: Normal- FR Speed Sensor Voltage Open FR speed sensor voltage open detection / Error or Normal Error: Momentary interruption
Normal: Normal- FL Speed Sensor Voltage Open FL speed sensor voltage open detection / Error or Normal Error: Momentary interruption
Normal: Normal- RR Speed Sensor Voltage Open RR speed sensor voltage open detection / Error or Normal Error: Momentary interruption
Normal: Normal- RL Speed Sensor Voltage Open RL speed sensor voltage open detection / Error or Normal Error: Momentary interruption
Normal: Normal- M/C Pressure Sensor Noise Master cylinder pressure sensor noise detection / Error or Normal Error: Momentary interruption
Normal: Normal- Brake Pedal Switch Open* Brake pedal load sensing switch open detection / Error or Normal Error: Momentary interruption
Normal: Normal- Yaw Rate Sensor Voltage Open Yaw rate sensor voltage open detection / Error or Normal Error: Momentary interruption
Normal: Normal- EFI Communication Invalid EFI communication invalid detection / Error or Normal Error: Momentary interruption
Normal: Normal- *: w/ Booster Failure Compensation
- While observing the screen, gently jiggle the connector or wire harness between the ECU and sensors, or between ECUs. If the display changes, the connector and/or wire harness is in momentary interruption (open circuit). Repair or replace the connector and/or wire harness, as one of them is faulty.