DTC P1605: Rough Idling [08/2013 - ]: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
5. Read the DTCs.
   RESULT
   
   

   Result	Proceed to
   DTC P1605 is output	A
   DTC P1605 and other DTCs are output	B

   HINT: 

   If any DTCs other than P1605 are output, troubleshoot those DTCs first.

B → See step   3 

A: Go to next step 

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Turn the Techstream on.
4. Check the following freeze frame data to see if the engine was cold or warm when the freeze frame data was recorded.
   CONFIRMATION ITEM
   
   

   Coolant Temp

   Initial Engine Coolant Temp

5. Check the following freeze frame data to see if the vehicle was idling.
   CONFIRMATION ITEM
   
   

   Engine Speed

6. Check the following freeze frame data to see purge VSV operation when the freeze frame data was recorded.
   CONFIRMATION ITEM
   
   

   EVAP (Purge) VSV

   Evap Purge Flow

   Purge Density Learn Value

   EVAP Purge VSV

7. Check the following freeze frame data to see engine idle operating conditions recorded.
   CONFIRMATION ITEM
   
   

   Throttle Position

   ISC Flow

   ISC Position

   Idle Spark Advn Ctrl #1

   Idle Spark Advn Ctrl #2

   Idle Spark Advn Ctrl #3

   Idle Spark Advn Ctrl #4

   ISC Feedback Value

   ISC Learning Value

   Electric Load Feedback Value

   Air Conditioner FB Val

   Low Revolution Control

   MAP

   EGR Step Position

8. Check the following freeze frame data to see the engine load and electric load.
   CONFIRMATION ITEM
   
   

   Calculate Load

   Electric Fan Motor

9. Use this information to perform a simulation test.
10. Compare the "Normal Condition" in the Data List table (reference values) with the freeze frame data listed above and with the simulation test results to determine the problem cause.
    RESULT
    
    

    Result	Proceed to
    The problem cause can be determined	A
    The problem cause cannot be determined	B

B → See step   4 

A → REPAIR OR REPLACE MALFUNCTIONING PARTS