Dtc P1601 Injector Correction Circuit Malfunction (Eeprom)

Land Cruiser URJ200 URJ202 GRJ200 VDJ200 - 1VD-FTV ENGINE CONTROL

DESCRIPTION

INSPECTION PROCEDURE

CHECK FUEL INJECTOR COMPENSATION CODE

REPLACE ECM

PERFORM REGISTRATION OF FUEL INJECTOR COMPENSATION CODE

CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

DTC P1601 Injector Correction Circuit Malfunction (EEPROM)

DESCRIPTION

P1601
DTC Detection Drive PatternDTC Detection ConditionTrouble Area
Ignition switch ON for 1 secondsWhen either condition below is met (1 trip detection logic):
Fuel injector compensation code is not registered.
Wrong injector compensation code is registered.
Fuel injector compensation code
ECM
  • NOTICE:
When a fuel injector is replaced, the new fuel injector compensation code must be input into the ECM. When the ECM is replaced, all of the existing fuel injector compensation codes must be input into the new ECM.
Fuel injector compensation codes are unique, 30-digit, alphanumeric values printed on the head portion of each fuel injector. If an incorrect fuel injector compensation code is input into the ECM, the engine assembly may rattle or engine idling may become rough. In addition, engine failure may occur and the life of the engine may be shortened.
  • HINT:
  • When replacing the ECM with a new one, if the injector compensation codes are not entered, DTC P1601 will be stored.
When replacing the ECM with a new one, input all fuel injector compensation codes into the new ECM as follows:

Prior to replacing the ECM, use the intelligent tester to read and save each fuel injector compensation code from the original ECM ().

After installing a new ECM, input the saved compensation codes into the new ECM using the tester ().

Turn the ignition switch off and then turn the tester off.

Wait for at least 30 seconds.

Turn the ignition switch to ON and then turn the tester on.

Clear DTC P1601 stored in the ECM using the tester ().

  • HINT:
Each fuel injector has different fuel injection characteristics. In order to optimize the fuel injections, the ECM uses the compensation codes to balance the different fuel injections between each injector.
When you first turn ON the ignition switch after replacing the ECM or a fuel injector(s), DTC P1601 is stored. If a fuel injector was replaced, the compensation code for the new fuel injector will need to be registered in the ECM. If the ECM was replaced, the compensation codes for the fuel injectors must be registered to the new ECM. Manually clear the DTC upon completion of compensation code registration.

INSPECTION PROCEDURE

  • NOTICE:
  • After replacing the ECM, the new ECM needs registration () and initialization ().
  • HINT:
  • Read freeze frame data using the intelligent tester. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, and other data from the time the malfunction occurred.
1.CHECK FUEL INJECTOR COMPENSATION CODE

Read the fuel injector compensation codes ().

  • OK:
  • Compensation codes stored in the ECM match compensation codes of the installed fuel injectors.
NG
Go to step 3
OK
2.REPLACE ECM

Replace the ECM ().

NEXT
Go to step 4
3.PERFORM REGISTRATION OF FUEL INJECTOR COMPENSATION CODE

Perform registration of the fuel injector compensation code ().

NEXT
4.CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

Connect the intelligent tester to the DLC3.

Clear the DTCs ().

Turn the ignition switch off.

Turn the ignition switch off and leave the vehicle for 15 seconds.

Turn the ignition switch to ON for 1 second.

Confirm that the DTC is not output again.

  • HINT:
  • Perform the following procedure using the tester to determine whether or not the DTC judgment has been carried out.

Enter the following menus: Powertrain / Engine / Utility / All Readiness.

Input DTC P1601.

Check that STATUS is NORMAL. If STATUS is INCOMPLETE or UNKNOWN, idle the engine.

NEXT
END