Computers and Control Systems: Service Precautions

2GR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: PRECAUTION

1. INITIALIZATION

NOTICE:
* When disconnecting the negative (-) battery cable, initialize the following systems after the cable is reconnected.






* Perform RESET MEMORY (AT initialization) when replacing the automatic transaxle assembly, engine assembly or ECM (U151E , U151F Programming and Relearning).
* Perform REGISTRATION (VIN registration) when replacing the ECM Programming and Relearning.

HINT
Initialization cannot be completed by only removing the battery.

2. FOR USING TECHSTREAM

CAUTION:
Observe the following items for safety reasons:

* Before using the Techstream, read the instruction manual.
* Prevent the Techstream cable from being caught on the pedals, shift lever and steering wheel when driving with the Techstream connected to the vehicle.
* When driving the vehicle for testing purposes using the Techstream, two persons are required. One is for driving the vehicle, and the other operates the Techstream.
3. FOR USING BATTERY DURING INSPECTION

(a) 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. EXPRESSION OF IGNITION SWITCH

HINT
The type of ignition switch used on this model differs according to the specifications of the vehicle.

The expressions listed in the table below are used in this section.





5. COOLING FAN SYSTEM

CAUTION:
* 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.
* Techstream indicates a very high coolant temperature.
* Techstream 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
* Mass air flow meter
* Vehicle speed sensors