Note. If a malfunction occurs and the engine ECU registers an incorrect injector correction code, the engine may start to jerk or idle unevenly. It can also cause engine malfunction and shorten engine life.
Note. When replacing the engine ECU, enter the override codes for all engine injectors into the new ECU.
Note. Before replacing the engine ECU, read and save the correction codes of all injectors stored in the old ECU using the handheld diagnostic tool II.
Note. After installing a new engine ECU, enter the saved correction codes into it using the handheld diagnostic tool II.
Note. Switch off the ignition and wait at least 30 C.
Note. Ignition ON, then clear DTC P1601 using the Handheld Diagnostic Tool II.
To optimize fuel injection performance, the engine ECU adjusts the injection timing for each cylinder. The engine ECU stores and uses the injector correction values, which are indicated as a 30-character alphanumeric code on the top of the injector.
When replacing an injector, the correction code for the new injector is entered into the engine ECU. When replacing the engine ECU, the correction codes for all injectors must be entered into the new ECU.
After replacing the engine ECU, DTC P1601 will be output when the ignition is turned on. The injector correction codes must be registered in the engine ECU. to clear the DTC, first set the correction codes, then turn off the ignition and wait at least 30 seconds.
Removing
Disconnect the negative battery terminal.
Remove the glove box cover assembly.
Disconnect the 4 engine ECU connectors.
Remove the bolt and screw, then remove the engine ECU.
Remove the 2 screws and remove bracket #1 from the engine ECU.
Remove the 2 screws and remove bracket #2 from the engine ECU.
Install the engine ECU.
Tightening torque: 5.0 Nm for bolt, 3.0 Nm for screw.
Install the glove box cover assembly.
Connect the negative terminal to the battery terminal.
Tightening torque: 5.4 Nm.
Register injector correction codes.
Clear the DTC.
Switch off the ignition and wait at least 30 seconds.
Ignition ON, then clear DTC P1601 using the Handheld Diagnostic Tool II.