DTC P1605-00: Rough Idling [10/2015 - ]: Procedure

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

   Powertrain > Engine > Trouble Codes 

   Result

   Result	Proceed to
   Only DTC P1605-00 is output	A
   DTCs other than P1605-00 are output	B

   HINT: 

   • If any DTCs other than P1605-00 are output, troubleshoot those DTCs first.
   • Using freeze frame data, confirm the conditions the moment the DTC was stored and after the DTC was stored. This information can be useful when troubleshooting.

Result: 

B 

GO TO DTC CHART. Refer to  DIAGNOSTIC TROUBLE CODE CHART [10/2015 - 08/2016]  , or refer to  DIAGNOSTIC TROUBLE CODE CHART [08/2016 - 11/2017]  , or refer to  DIAGNOSTIC TROUBLE CODE CHART [11/2017 - 10/2018]  , or refer to  DIAGNOSTIC TROUBLE CODE CHART [10/2018 - 11/2019]  , or refer to  DIAGNOSTIC TROUBLE CODE CHART [11/2019 - 09/2020]  , or refer to  DIAGNOSTIC TROUBLE CODE CHART [09/2020 - 10/2022]  , or refer to  DIAGNOSTIC TROUBLE CODE CHART [10/2022 - ] 

Result: 

A 

See step  2

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the Techstream on.
4. Using the Techstream, confirm the vehicle conditions recorded in the freeze frame data which were present when the DTC was stored.

   Refer to FREEZE FRAME DATA [10/2015 - 11/2017] , or refer to FREEZE FRAME DATA [11/2017 - 10/2018] , or refer to FREEZE FRAME DATA [10/2018 - 11/2019] , or refer to FREEZE FRAME DATA [11/2019 - 09/2020] , or refer to FREEZE FRAME DATA [09/2020 - 10/2022] , or refer to FREEZE FRAME DATA [10/2022 - ]

   Result

   Freeze Frame Data Item for DTC P1605-00		Suspected Area	Action	Proceed to
   Rough Idle Cylinder #1 to #4 Plural Cylinders Rough Idle	Compression Leakage Count
   "One of Rough Idle Cylinder #1 to #4 is ON" and "Plural Cylinders Rough Idle is OFF"	4 or less	Spark plug Ignition coil assembly Port fuel injector assembly Direct fuel injector assembly	Go to ROUGH IDLING (from step 7)	A
   Plural Cylinders Rough Idle is ON	4 or less	Mass air flow meter sub-assembly Port fuel injector assembly Direct fuel injector assembly Fuel system (low or high pressure) Air fuel ratio sensor	Go to ROUGH IDLING (from step 15)	B
   "One of Rough Idle Cylinder #1 to #4 are ON" or "Plural Cylinders Rough Idle is ON"	5 or more	Pressure loss from valve damage, deposits jamming the valve etc.	Check compression and clean deposits in combustion chamber and intake system.	C

Result: 

B 

See step  4

Result: 

C 

See step  5

Result: 

A 

See step  3

1. Perform troubleshooting from Rough Idling step 7 (PERFORM ACTIVE TEST USING TECHSTREAM (CHECK THE CYLINDER COMPRESSION)) and onward.

   Refer to PROCEDURE - Step 7 [10/2015 - 11/2017] , or refer to PROCEDURE - Step 7 [11/2017 - 10/2018] , or refer to PROCEDURE - Step 7 [10/2018 - 11/2019] , or refer to PROCEDURE - Step 7 [11/2019 - ]

   Result

   Proceed to
   NEXT

Result: 

NEXT 

GO TO ROUGH IDLING. Refer to  Rough Idling [10/2015 - 11/2017]  , or refer to  Rough Idling [11/2017 - 10/2018]  , or refer to  Rough Idling [10/2018 - 11/2019]  , or refer to  Rough Idling [11/2019 - ] 

1. Perform troubleshooting from Rough Idling step 15 (READ VALUE USING TECHSTREAM (MASS AIR FLOW SENSOR)) and onward.

   Refer to PROCEDURE - Step 15 [10/2015 - 11/2017] , or refer to PROCEDURE - Step 15 [11/2017 - 10/2018] , or refer to PROCEDURE - Step 15 [10/2018 - 11/2019] , or refer to PROCEDURE - Step 15 [11/2019 - ]

   Result

   Proceed to
   NEXT

Result: 

NEXT 

GO TO ROUGH IDLING. Refer to  Rough Idling [10/2015 - 11/2017]  , or refer to  Rough Idling [11/2017 - 10/2018]  , or refer to  Rough Idling [10/2018 - 11/2019]  , or refer to  Rough Idling [11/2019 - ] 

1. Warm up the engine.
2. Turn the engine switch off.
3. Connect the Techstream to the DLC3.
4. Turn the engine switch on (IG).
5. Turn the Techstream on.
6. Enter the following menus: Powertrain / Engine / Active Test / Check the Cylinder Compression / Data List / Compression / Engine Speed Cylinder #1 to #4 and Average Engine Speed of All Cylinder.

   Powertrain > Engine > Active Test 

   Active Test Display
   Check the Cylinder Compression

   Data List Display
   Engine Speed Cylinder #1
   Engine Speed Cylinder #2
   Engine Speed Cylinder #3
   Engine Speed Cylinder #4
   Average Engine Speed of All Cylinder

   HINT: 

   To display the entire Data List, press the pull down menu button next to Primary. Then select Compression.

7. Push the snapshot button to turn the snapshot function on.

   HINT: 

   Using the snapshot function, data can be recorded during the Active Test.

8. While the engine is not running, press the Active test button to change Check the Cylinder Compression to "Start".

   HINT: 

   After performing the above procedure, Check the Cylinder Compression will start. Fuel injection for all cylinders is prohibited and each cylinder engine speed measurement enters standby mode.

9. Crank the engine for about 10 seconds.
10. Monitor the engine speed (Engine Speed Cylinder #1 to #4 and Average Engine Speed of All Cylinder) displayed on the Techstream.

    HINT: 

    • At first, the Techstream will display extremely high cylinder engine speed values. After approximately 10 seconds of engine cranking, the engine speed measurement of each cylinder will change to the actual engine speed.
    • If the cylinder engine speed values (Engine Speed Cylinder #1 to #4) displayed in the Data List do not change from an extremely high value, return to the Active Test menu screen, change "Check the Cylinder Compression" to "Start" and crank the engine again within 1 second.
    NOTE:

    • Do not crank the engine continuously for 20 seconds or more.
    • If it is necessary to crank the engine again after Check the Cylinder Compression has been changed to "Start" and the engine has been cranked once, press Exit to return to the Active Test menu screen. Then change Check the Cylinder Compression to "Start" and crank the engine.
    • Use a fully-charged battery.
11. Stop cranking the engine, and then change "Check the Cylinder Compression" to "Stop" after the engine stops.
    NOTE:

    • If the Active Test is changed to "Stop" while the engine is being cranked, the engine will start.
    • When performing the Active Test, DTC P1604-00 (Startability Malfunction) may be stored.
    • After performing the Active Test, make sure to check and clear DTCs.
12. Push the snapshot button to turn the snapshot function off.
13. Select "Stored Data" on the Techstream screen, select the recorded data and display the data as a graph.

    HINT: 

    If the data is not displayed as a graph, the change of the values cannot be observed.

14. Read the value.

    HINT: 

    • If the value of Data List item "Engine Speed Cylinder #1 to #4" of a cylinder is higher than other cylinders, the cylinder may be malfunctioning.
    • If the value of Data List item "Engine Speed Cylinder #1 to #4" is high for only one cylinder, compression loss is suspected.

    Result

    Result	Proceed to
    There is no variation in "Engine Speed Cylinder #1 to #4" (All cylinders display approximately the same value for "Engine Speed Cylinder #1 to #4")	A
    There is variation in "Engine Speed Cylinder #1 to #4" (Only one cylinder displays a value for "Engine Speed Cylinder #1 to #4" that differs considerably)	B

Result: 

A 

CLEAN OFF ANY DEPOSITS 

Result: 

B 

See step  6

1. Measure the cylinder compression pressure. If the compression pressure of a cylinder is low, inspect the engine assembly and repair or replace parts as necessary.

   Refer to PROCEDURE - Step 10 [10/2015 - 09/2020] , or refer to PROCEDURE - Step 10 [09/2020 - ]

   Result

   Proceed to
   NEXT

Result: 

NEXT 

END