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.

2009 Toyota Sienna CEFACTORY OEM SERVICE PROCEDURE

Inspection Procedure

WARNING: This page is about a different car, the 2009 Toyota Corolla. However, it is still accessible from the selected car via links, so may be relevant.

CHECK ENGINE CONTROL SYSTEM

Check if the engine control system DTC is output (See DTC CHECK / CLEAR for 2AZ-FE, or DTC CHECK / CLEAR for 2ZR-FE).

Result

RESULT CHART

Result	Proceed to
DTC is not output (for 2AZ-FE)	A
DTC is not output (for 2ZR-FE)	B
DTC is output (for 2AZ-FE)	C
DTC is output (for 2ZR-FE)	D

B: REPLACE ECM (for 2ZR-FE) (See REMOVAL )

C: INSPECT ENGINE CONTROL SYSTEM (for 2AZ-FE) (See DIAGNOSTIC TROUBLE CODE CHART )

D: INSPECT ENGINE CONTROL SYSTEM (for 2ZR-FE) (See DIAGNOSTIC TROUBLE CODE CHART )

A: REPLACE ECM (for 2AZ-FE) (See REMOVAL )

Chapter Navigation

Return to Chapter: DTC C1201/51 Engine Control System Malfunction

Factory Service Tools

Use the Manual With the Right Hardware

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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.