CHECK FOR INTERMITTENT PROBLEMS
Tech Tips
A momentary interruption (open circuit) in the connectors and/or wire harness between the sensors and ECUs can be detected using the Data List function of the GTS.
Turn the engine switch off.
Connect the GTS to the DLC3.
Turn the engine switch on (IG).
Turn the GTS on.
Follow the directions on the GTS to display the Data List and select areas where momentary interruption should be monitored.
Tech Tips
A momentary interruption (open circuit) cannot be detected for 3 seconds after the engine switch is turned on (IG) (initial check).
If Error remains displayed for one of the items on the GTS, 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 GTS, Error will remain displayed on the GTS for 1 second after the circuit returns to normal.
| 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". |
| 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". |
| RR Speed Open | Rear 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". |
| 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". |
| EFI Communication Open | ECM 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". |
| 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". |
| 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". |
| Steering Open | Steering angle 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". |
| Master Cylinder Open | Master 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". |
| FR Speed Sensor Voltage Open | Front speed sensor RH voltage 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". |
| FL Speed Sensor Voltage Open | Front speed sensor LH voltage 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". |
| RR Speed Sensor Voltage Open | Rear speed sensor RH voltage 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". |
| RL Speed Sensor Voltage Open | Rear speed sensor LH voltage 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". |
| M/C Pressure Sensor Noise | Master cylinder pressure sensor noise detection | Error or Normal | Error: Noise detected Normal: Noise not detected |
After noise occurs, if there is no noise for 5 seconds, it switches from "Error" to "Normal". |
| Brake Pedal Switch Open | Brake pedal load sensing switch 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". |
| Yaw Rate Sensor Voltage Open | Yaw rate sensor voltage 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". |
| EFI Communication Invalid | ECM communication invalid detection | Error or Normal | Error: ECM communication invalid state detected Normal: ECM communication invalid state not detected |
After ECM communication invalid state occurs, if there no further invalid state occurs, it switches from "Error" to "Normal". |
| Master Cylinder Pressure Sensor Power Supply Open | Master cylinder pressure sensor power supply voltage status | 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". |
| Solenoid Power Supply Open | Solenoid power supply voltage status | 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". |
| Motor Power Supply Open | Motor power supply voltage status | 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". |
| Stop Switch Open | Momentary interruption (open circuit) status in wire harness between skid control ECU (brake actuator assembly) and stop light switch assembly status | 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". |
| Air Bag ECU Communication Open | Air bag ECU 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". |
While observing the screen, gently jiggle the connector or wire harness between the ECU and sensors, or between ECUs.
Tech Tips
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.