Dtc P1601 Injector Correction Circuit Malfunction (Eeprom)

DESCRIPTION

INSPECTION PROCEDURE

LEARNING VALUES CONFIRMATION

REGISTER INJECTOR COMPENSATION CODE

LEARNING VALUES WRITE

LEARNING VALUES CONFIRMATION

PILOT QUANTITY LEARNING

CHECK DTC OUTPUT

REPLACE ECM

CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

DESCRIPTION

NOTICE:

1. When a injector assembly is replaced, the new injector compensation code must be input into the ECM. When the ECM is replaced, all of the existing injector compensation codes must be input into the new ECM.
   
2. Injector compensation codes are unique, 30-digit, alphanumeric values printed on the head portion of each injector assembly. If an incorrect 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.
   
3. When a injector assembly is replaced, perform pilot quantity learning. When the ECM is replaced, all of the existing injector pilot quantity learning values must be input into the new ECM.
   

HINT:

When replacing the ECM with a new one, if the injector compensation code and/or injector pilot quantity learning value are not entered, DTC P1601 will be stored.

1. Prior to replacing the ECM, use the intelligent tester to read and save each learning value and code from the original ECM (Toyota Fortuner RM0000012XK04AX.html).
   

2. After installing a new ECM, input the saved learning values and codes into the new ECM using the tester (Toyota Fortuner RM0000012XK04AX.html).
   

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

4. Wait for at least 30 seconds.
   

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

6. Clear the DTC P1601 stored in the ECM using the tester (Toyota Fortuner RM000000PDK0TWX.html).
   

   HINT:

   1. Each injector assembly 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 assembly.
      
   2. When you first turn the ignition switch to ON after replacing the ECM and one or more other components, DTC P1601 is stored. Manually clear the DTC upon completion of compensation code registration.
      
      

      Replacement Part	Utility Item
      ECM	Learning Values Save (Toyota Fortuner RM0000012XK04AX_02_0007.html) Learning Values Write (Toyota Fortuner RM0000012XK04AX_02_0008.html)
      Injector assembly	Input Injector Compensation Code (Toyota Fortuner RM0000012XK04AX_02_0003.html) Pilot Quantity Learning (Toyota Fortuner RM0000012XK04AX_02_0009.html)

INSPECTION PROCEDURE

NOTICE:

After replacing the ECM, the new ECM needs registration (Toyota Fortuner RM0000012XK04AX.html) and initialization (Toyota Fortuner RM000000TIN04KX.html).

1. Connect the intelligent tester to the DLC3.
   

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

   NOTICE:

   Do not start the engine.

3. Enter the following menus: Powertrain / Engine and ECT / Utility / Learning values confirmation (Toyota Fortuner RM0000012XK04AX_02_0006.html).
   
   

   Result

   Result	Proceed to
   The injector compensation codes are not input	A
   The injector compensation codes registered in the ECM are different than the codes imprinted on the injector assemblies	A
   The pilot quantity learning values are set to the default values	B
   Except above	C

   HINT:

   When the injector pilot quantity learning values are set to the default values, "7FFF" is displayed.

1. Register the injector compensation code (Toyota Fortuner RM0000012XK04AX_02_0003.html).
   

HINT:

When replacing the ECM, after performing "Learning Values Save" to save the learned values from the old ECM using the intelligent tester and replacing the old ECM with a new one, "Learning Values Write" was not performed using the intelligent tester causing this DTC to be output.

1. Install the old ECM.
   

2. Connect the intelligent tester to the DLC3.
   

3. Turn the ignition switch to ON and turn the intelligent tester on.
   

4. Enter the following menus: Powertrain / Engine and ECT / Utility / Learning values save (Toyota Fortuner RM0000012XK04AX_02_0007.html).
   

5. Remove the old ECM.
   

6. Install a new ECM.
   

7. Enter the following menus: Powertrain / Engine and ECT / Utility / Learning values write (Toyota Fortuner RM0000012XK04AX_02_0008.html).
   

1. Connect the intelligent tester to the DLC3.
   

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

   NOTICE:

   Do not start the engine.

3. Enter the following menus: Powertrain / Engine and ECT / Utility / Learning values confirmation (Toyota Fortuner RM0000012XK04AX_02_0006.html).
   
   

   Result

   Result	Proceed to
   The pilot quantity learning values are set to the default values	A
   Except above	B

   HINT:

   When the injector pilot quantity learning values are set to the default values, "7FFF" is displayed.

1. Perform the injector pilot quantity learning (Toyota Fortuner RM0000012XK04AX_02_0009.html).
   

1. Connect the intelligent tester to the DLC3.
   

2. Clear the DTCs (Toyota Fortuner RM000000PDK0TWX.html).
   

3. Turn the ignition switch off and leave the vehicle for 30 seconds or more.
   

4. Turn the ignition switch to ON for 1 second.
   

5. Enter the following menus: Powertrain / Engine and ECT / DTC.
   

6. Read the DTCs.
   

   Result

   Result	Proceed to
   No DTC is output	A
   P1601 is output	B

1. Replace the ECM (Toyota Fortuner RM0000043H100CX.html).
   

1. Connect the intelligent tester to the DLC3.
   

2. Clear the DTCs (Toyota Fortuner RM000000PDK0TWX.html).
   

3. Turn the ignition switch off and leave the vehicle for 30 seconds or more.
   

4. Turn the ignition switch to ON for 1 second.
   

5. Enter the following menus: Powertrain / Engine and ECT / DTC.
   

6. Confirm that the DTC is not output again.