HINT:

Whether the abnormality occurs in the DPNR catalyst thermal deterioration history data or in the injector compensation code can be determined by checking the Data List.

Toyota fault code list DTC P1601

DTC No.	DTC Detection Condition	Trouble Area
P1601	When either condition below is met: Injector compensation code is not registered (1 trip detection logic) Wrong injector compensation code is registered (1 trip detection logic)	Injector compensation code ECM
	When either condition below is met: The DPNR catalyst thermal deterioration history data in the ECM is still the initial value (1 trip detection logic) The DPNR catalyst thermal deterioration history data is not recorded correctly in the ECM (2 trip detection logic)

 

NOTICE:

After replacing the ECM, the new ECM needs registration and initialization.

1.CONFIRM ECM

1. Confirm if DTC P1601 was output because a new ECM was installed.

    

   Result:

   Result	Proceed to
   DTC P1601 was output due to new ECM being installed	A
   DTC P1601 was output due to original ECM malfunction	B

 

A	Go to step 15

B

2.CHECK DTC OUTPUT

1. Connect the intelligent tester to the DLC3.

2. Turn the ignition switch on (IG) and turn the tester ON.

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

4. Read the DTCs.

    

   Result:

   Display (DTC Output)	Proceed to
   P1601	A
   Other output	B

 

B	GO TO DTC CHART

A

3.CHECK DATA LIST (INJECTOR MEMORY ERROR AND DPNR CATALYST DETERIORATE)

1. Connect the intelligent tester to the DLC3.

2. Turn the ignition switch on (IG) and turn the tester ON.

3. Enter the following menus: Powertrain / Engine and ECT / Catalyst Memory Error and Injector Memory Error.

    

   Result:

   Item	Proceed to
   Catalyst Memory Error: Error Injector Memory Error: No Error	A
   Catalyst Memory Error: No Error Injector Memory Error: Error	B
   Catalyst Memory Error: Error Injector Memory Error: Error	C

 

B	Go to step 8
C	Go to step 12

A

4.READ INJECTOR COMPENSATION CODE

1. Using the intelligent tester, read the injector compensation code.

 

NEXT

5.REPLACE ECM AND EXHAUST MANIFOLD CONVERTER SUB-ASSEMBLY

1. Replace the ECM.

2. Replace the exhaust manifold converter sub-assembly.

 

NEXT

6.REGISTER INJECTOR COMPENSATION CODE

1. Input the injector compensation code read with the intelligent tester.

 

NEXT

7.CLEAR CATALYST RECORD

1. Clear the catalyst record of DPNR thermal deterioration.

 

NEXT
END

8.READ CATALYST RECORD OF DPNR THERMAL DETERIORATION

1. Read the catalyst record of DPNR thermal deterioration.

 

NEXT

9.REPLACE ECM

1. Replace the ECM.

 

NEXT

10.SET CATALYST RECORD OF DPNR THERMAL DETERIORATION

1. Set the catalyst record of DPNR thermal deterioration.

 

NEXT

11.REGISTER INJECTOR COMPENSATION CODE

1. Input the injector compensation code written on the injector.

 

NEXT
END

12.REPLACE ECM AND EXHAUST MANIFOLD CONVERTER SUB-ASSEMBLY

1. Replace the ECM.

2. Replace the exhaust manifold converter sub-assembly.

 

NEXT

13.REGISTER INJECTOR COMPENSATION CODE

1. Input the injector compensation code written on the injector.

 

NEXT

14.CLEAR CATALYST RECORD

1. Clear the catalyst record of DPNR thermal deterioration.

 

NEXT
END

15.CHECK DTC OUTPUT

1. Connect the intelligent tester to the DLC3.

2. Turn the ignition switch on (IG) and turn the tester ON.

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

4. Read the DTCs.

    

   Result:

   Display (DTC Output)	Proceed to
   P1601	A
   Other output	B

 

B	GO TO DTC CHART

A

16.CHECK DATA LIST (INJECTOR MEMORY ERROR AND DPNR CATALYST DETERIORATE)

1. Connect the intelligent tester to the DLC3.

2. Turn the ignition switch on (IG) and turn the tester ON.

3. Enter the following menus: Powertrain / Engine and ECT / Catalyst Memory Error and Injector Memory Error.

    

   Result:

   Item	Proceed to
   Catalyst Memory Error: Error Injector Memory Error: No Error	A
   Catalyst Memory Error: No Error Injector Memory Error: Error	B
   Catalyst Memory Error: Error Injector Memory Error: Error	C

 

B	Go to step 22
C	PERFORM PROCEDURE A AND B

A

17.CHECK EXHAUST MANIFOLD CONVERTER SUB-ASSEMBLY

1. Confirm if the exhaust manifold converter sub-assembly has been replaced or not during the current repair.

 

YES	Go to step 21

NO

18.CHECK IF DTC P1601 IS OUTPUT IN ORIGINAL ECM

1. Check if DTC P1601 was output in the original ECM.

 

YES	Go to step 21

NO

19.CHECK CATALYST RECORD OF DPNR THERMAL DETERIORATION

1. Read the catalyst record of DPNR thermal deterioration from old ECM.

2. Set the catalyst record of DPNR thermal deterioration to new ECM.

 

NEXT

20.CHECK IF DTC OUTPUT

1. Connect the intelligent tester to the DLC3.

2. Turn the ignition switch on (IG) and turn the tester ON.

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

4. Read the DTCs.

    

   Result:

   Display (DTC Output)	Proceed to
   P1601	A
   Not P1601	B

 

A	Go to step 19

B
END

21.CLEAR CATALYST RECORD

1. Clear the catalyst record of DPNR thermal deterioration.

 

NEXT
END

22.REGISTER INJECTOR COMPENSATION CODE

1. Input the injector compensation codes.

    

   HINT:

   1. If DTC P1601 was output in the previously installed ECM, input the injector code written on the injector in the new ECM.
   2. If DTC P1601 was not output in the previously installed ECM, input the injector code registered in the previously installed ECM to the new ECM.

 

NEXT

23.CHECK IF DTC OUTPUT

1. Connect the intelligent tester to the DLC3.

2. Turn the ignition switch on (IG) and turn the tester ON.

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

4. Read the DTCs.

    

   Result:

   Display (DTC Output)	Proceed to
   P1601	A
   Not P1601	B

 

A	REGISTER INJECTOR COMPENSATION CODE

B
END