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| Because individual injectors have different injection characteristics, the engine-ECU
corrects injection time for each cylinder to improve injection accuracy. For this reason, when the injector or engine-ECU is replaced, injector correction data
must be registered afterwards in the engine-ECU using the Multi Use Tester III (M.U.T.-III). Correction data is converted into an identification code consisting of 30 alphanumeric
characters and printed on the injector connector.
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| 1.
When replacing the engine-ECU, connect the current engine-ECU to the body harness.
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| 2.
After the ignition switch is in "LOCK" (OFF) position, connect the M.U.T.-III to the
diagnosis connector.
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| 3.
Turn the ignition switch to "ON" position.
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| 4.
Select SPECIAL FUNCTION from the function menu.
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| 5.
When the current engine-ECU is still mounted, read and register the injector identification
code as follows: (1)Select Read Injector ID Code (for engine-ECU replacement) from the SPECIAL FUNCTION
menu. (2)Select Write and Save Injector ID Code from the menu to read data from the current
engine-ECU and save the data if it could be read normally. (3)Mount the new engine-ECU on the vehicle. (4)Select SPECIAL FUNCTION from the function menu. (5)Select Write Injector ID Code (for engine-ECU replacement) from the SPECIAL FUNCTION
menu. (6)Select SAVED INJECTOR ID WRITING from the Write Injector ID Code menu to write the
data, which was saved previously, to the engine-ECU.
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![](../../../img/00/ZK603428AA00ALL.png)
| 6.
If the injector has been replaced or data has not been read from the current engine-ECU,
register the injector identification code as follows: (1)Select Write Injector ID Code from the SPECIAL FUNCTION menu. (2)If the injector was replaced, specify whether to write to every cylinder or a specific
cylinder. (3)Select the write mode from the menu, enter the identification code printed on the injector,
and execute writing.
caution | Even if the number of the cylinder to be registered does not
match the actual injector mounting location, registration ends normally. Specify the cylinder
number correctly.
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note | The identification code is displayed in order of the frame numbers when it is read.
| 7.
Makes sure that the engine warning lamp that is on changes to blinking, indicating
the registration is complete.
note | When the injector is replaced, executing the write operation also clears the values of
small injection quantity learning.
| 8.
Execute small injection quantity learning. Refer to , the SMALL INJECTION QUANTITY LEARNING
PROCEDURE for the learning procedure. 9.
Confirm that the engine warning lamp is off. Confirm also that the diagnosis code is not stored.
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