Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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 in the ECU data monitor function of the hand-held tester.
- Turn the power switch off and connect the hand-held tester to the DLC3.
- Turn the ignition switch on. Follow the on-screen directions on the hand-held tester 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 on (initial check).
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INTERMITTENT PROBLEMSItem Measurement Item Range (Display) Normal Condition SPDSEN FR FR speed sensor open detection OPEN or NORMAL NORMAL: Normal condition SPDSEN FL FL speed sensor open detection OPEN or NORMAL NORMAL: Normal condition SPD SEN RR RR speed sensor open detection OPEN or NORMAL NORMAL: Normal condition SPD SEN RL RL speed sensor open detection OPEN or NORMAL NORMAL: Normal condition TAWRATE SEN Yaw rate sensor open detection NORMAL: Normal condition DECELE SEN G sensor open detection NORMAL: Normal condition STEERING SEN Steering sensor open detection NORMAL: Normal condition M C SEN 1 Master Cylinder pressure sensor 1 open detection NORMAL: Normal condition M C SEN 2 Master Cylinder pressure sensor 1 open detection NORMAL: Normal condition STROKE SEN 1 Pedal stroke 1 open NORMAL: Normal condition FR W C SEN FR Wheel cylinder open NORMAL: Normal condition FL W/C SEN FR Wheel cylinder open NORMAL: Normal condition RR W/C SEN FR Wheel cylinder open NORMAL: Normal condition RL W/C SEN FR Wheel cylinder open NORMAL: Normal condition Item Measurement Item Range (Display) Normal Condition HVCOM HV communication open detection NORMAL: Normal condition ACC SEN Accumulator pressure sensor open detection NORMAL: Normal condition HINT:
- If the status remains on, check the continuity between the ECU and the sensors, or between ECUs.
- The OPEN display on the hand-held tester remains on for 1 second after the harness signal changes from momentary interruption (open circuit) to normal condition.
- While observing the screen, gently jiggle the connector or wire harness between the ECU and sensors, or between ECUs.
- Result: Open-screen display does not change.
HINT:
- The connector and or wire harness will be in momentary interruption (open circuit) if the chart fluctuates. Repair or replace connector and or wire harness as one of them is faulty.
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.