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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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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.
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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.
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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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