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
2010 Scion tC L4-2.4L (2AZ-FE)SECTION Check for Intermittent Problems
2AZ-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: CHECK FOR INTERMITTENT PROBLEMS
HINT
Techstream only:
Inspect the vehicle's ECM using check mode. Intermittent problems are easier to detect with the Techstream when the ECM is in check mode. In check mode, the ECM uses 1 trip detection logic, which is more sensitive to malfunctions than normal mode (default), which uses 2 trip detection logic.
1. Clear the DTCs DTC Check / Clear.
2. Switch the ECM from normal mode to check mode using the Techstream Check Mode Procedure.
3. Perform a simulation test How To Proceed With Troubleshooting.
4. Check and wiggle the harnesses, connectors and terminals Electronic Circuit Inspection Procedure.
RENDER: 1.0x
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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.