Toyota Sienna Service Manual: Precaution

1. INITIALIZATION

NOTICE:

•  Perform RESET MEMORY (AT initialization) when replacing the automatic transaxle assembly, engine assembly or ECM.
•  Perform REGISTRATION (VIN registration) when replacing the ECM.

HINT: Initialization cannot be completed by only removing the battery.

2. FOR USING INTELLIGENT TESTER

CAUTION: Observe the following items for safety reasons:

•  Before using the tester, read the instruction manual.
•  Prevent the tester cable from being caught on the pedals, shift lever and steering wheel when driving with the tester connected to the vehicle.
•  When driving the vehicle for testing purposes using the tester, two persons are required. One is for driving the vehicle, and the other operates the tester.

3. FOR USING BATTERY DURING INSPECTION

1.  While using the battery during inspection, do not bring the positive and negative tester probes too close to each other as a short circuit may occur.

4. COOLING FAN SYSTEM

NOTICE:

•  When the ignition switch is turned off and the engine temperature is high, the cooling fans may operate for approximately 3 minutes.
•  After turning the ignition switch off, keep hands and objects away from the fans when they are operating.

HINT: If all of the following are met for a certain period of time during a few minute period immediately before the engine is stopped, the electric fans will continue to operate for 3 minutes after the engine is stopped. This is performed to ensure restartability and stabilize idle speed.

•  The intelligent tester indicates a very high coolant temperature.
•  The intelligent tester indicates a high outside air temperature.
• The vehicle has been driven under high load (driving on an uphill or equivalent).

The following sensors are used for this control:

•  Coolant temperature sensor
•  Outside air temperature sensor
•  MAF sensor
•  Vehicle speed sensors