Rough Idling [11/2016 - ]: Procedure

1. Interview the customer for details about the conditions when the rough idle occurred.

   HINT: 

   Depending on the conditions when the rough idle occurred, a malfunction in one of the following areas is suspected.

   Problem Symptom	Suspected Area
   Improper running of the engine in particular by idling after it is started cold, and improper running is felt less after the engine speed is increased.	Possibly caused by excessive EGR due to defective closing of the EGR valve
   Hesitation or lack of power occurs during acceleration, regardless of whether engine is cold or warm	For low mileage vehicles (ODO reading of less than approximately 20000 km or yearly mileage of less than 2000 km): Fuel quality (degradation, water contamination, etc.) For high mileage vehicles (ODO reading of more than approximately 150000 km): Excessively lean air fuel ratio during acceleration due to deposits in intake system or combustion chamber caught temporarily on intake or exhaust valve or adherence of fuel to the deposits Abnormal mass air flow meter sub-assembly output due to existence of foreign matter Decrease in fuel injector assembly injection volume due to low quality fuel
   Engine stalls or is difficult to start immediately after engine stalled, regardless of whether engine is cold or warm	Deposits in intake system or combustion chamber caught temporarily on intake or exhaust valve

NEXT 

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

   Powertrain > Engine and ECT > Trouble Codes 

   Result

   Result	Proceed to
   DTCs are not output	A
   DTC is output (DTCs other than P1604 or P1605 are output)	B

Result:  2

B 

GO TO DTC CHART. Refer to  DIAGNOSTIC TROUBLE CODE CHART [11/2016 - 10/2017]  Refer to  DIAGNOSTIC TROUBLE CODE CHART [10/2017 - ] 

Result:  1

A 

See step  3

1. Check if the problem symptoms reported in the customer problem analysis recur.

   HINT: 

   If the problem symptoms do not recur, attempt to reproduce the conditions when the malfunction occurred based on the result of the customer problem analysis.

   Result

   Result	Proceed to
   The problem symptom recurs	A
   The problem symptom does not recur (occurred in the past)	B

Result:  2

B 

CHECK FOR INTERMITTENT PROBLEMS. Refer to  CHECK FOR INTERMITTENT PROBLEMS [11/2016 - ] 

Result:  1

A 

See step  4

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 / Data List / ISC Learning Value.

   Powertrain > Engine and ECT > Data List 

   Tester Display
   ISC Learning Value

5. Read the value displayed on the Techstream.

   Result

   Result	Proceed to
   Less than 8.4 L/s	A
   Other than above	B

Result:  2

B 

See step  18

Result:  1

A 

See step  5

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 / Data List / Short FT B1S1, Long FT B1S1, Short B2S1 and Long FT B2S1.

   Powertrain > Engine and ECT > Data List 

   Tester Display
   Short FT B1S1
   Long FT B1S1
   Short FT B2S1
   Long FT B2S1

5. Read the value displayed on the Techstream.

   Result

   Data List	Result	Proceed to
   Short FT B1S1 (B2S1) + Long FT B1S1 (B2S1)	-20% or higher, or less than 20%	A
   	Other than above	B

   HINT: 

   • "Total FT" is used to detect an abnormal air fuel ratio. As the value of "Total FT" is corrected by the ECM before it is displayed in the Data List, the displayed value may not be equal to the sum of the measured "Short FT" and "Long FT".
   • An abnormally lean or rich tendency can be checked by reading the following Data List items: A/F Learn Value Idle, A/F Learn Value Low, A/F Learn Value Mid1, A/F Learn Value Mid2, A/F Learn Value High, A/F Learn Val Low (Dual), A/F Learn Val Mid1 (Dual), A/F Learn Val Mid2 (Dual) and A/F Learn Val High (Dual). (For vehicles equipped with a V type engine, check that both banks have the same correction tendency. If the correction of either bank is -20% or less or +20% or more, the air fuel ratio sensor or heated oxygen sensor of that bank may be malfunctioning.)
   • The following may cause a lean air fuel ratio (an operating range in which the air fuel ratio learned value correction is +20% or more):
     1. Decrease in fuel injector assembly injection volume
     2. Decrease in mass air flow meter sub-assembly output (due to existence of foreign matter)
     3. Air leaks in intake system after mass air flow meter sub-assembly
     4. Decrease in fuel pressure (at fuel filter, fuel pump, fuel main valve assembly or fuel suction plate sub-assembly)
   • On vehicles which the learning value for each operating range can be checked, if the value of "A/F Learn Value High" or "A/F Learn Val High (Dual)"only is corrected to the positive side, a malfunction in the fuel system (clogging of the fuel pump or fuel filter) is suspected.
   • On vehicles which the learning value for each operating range can be checked, if the value of "A/F Learn Value Idle", "A/F Learn Value Low" or "A/F Learn Val Low (Dual)" only is corrected to the positive side, an air leak after the mass air flow meter sub-assembly is suspected.
   • The following may cause a rich air fuel ratio (an operating range in which the air fuel ratio learned value correction is -20% or less):
     1. Increase in the fuel injector assembly injection volume
     2. Purge VSV system

Result:  2

B 

See step  15

Result:  1

A 

See step  6

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Turn the Techstream on.
4. Put the engine in inspection mode (maintenance mode).

   Powertrain > Hybrid Control > Utility 

   Tester Display
   Inspection Mode

5. Start the engine.

   HINT: 

   Reproduce the vehicle conditions when the malfunction occurred (such as after the engine is warmed up or after a cold start).

6. Enter the following menus: Powertrain / Engine and ECT / Active Test / D-4S (Fuel Cut) / Data List / Engine Speed.

   Powertrain > Engine and ECT > Active Test 

   Active Test Display
   D-4S (Fuel Cut)

   Data List Display
   Engine Speed

7. According to the display on the Techstream, perform the Active Test and check for a malfunctioning cylinder.

   HINT: 

   • Perform fuel-cut of port injection and direct injection for each cylinder and check the change in the engine speed.
   • If the engine speed of a cylinder does not change while performing the Active Test, it can be determined that the cylinder is malfunctioning.
   • If the engine speed of all cylinders change while performing the Active Test, it can be determined that multiple cylinders are malfunctioning.
   • A cylinder for which the Data List item "Cylinder Misfire Count" increases may be malfunctioning.

   Result

   Result	Proceed to
   One cylinder is malfunctioning	A
   Multiple or all cylinders are malfunctioning, or the malfunctioning cylinder cannot be determined.	B

Result:  2

B 

See step  13

Result:  1

A 

See step  7

HINT: 

If the vehicle does not support the Active Test "Check the Cylinder Compression", measure the compression pressure. If the compression pressure is normal, go to step 8.

1. Warm up the engine.
2. Turn the power switch off.
3. Connect the Techstream to the DLC3.
4. Turn the power switch on (IG).
5. Turn the Techstream on.
6. Put the engine in inspection mode (maintenance mode).

   HINT: 

   Do not start the engine.

   Powertrain > Hybrid Control > Utility 

   Tester Display
   Inspection Mode

7. Enter the following menus: Powertrain / Engine and ECT / Active Test / Check the Cylinder Compression / Data List / Engine Speed of Cly #1 to #6 and Av Engine Speed of All Cly.

   Powertrain > Engine and ECT > Active Test 

   Active Test Display
   Check the Cylinder Compression

   Data List Display
   Engine Speed of Cyl #1
   Engine Speed of Cyl #2
   Engine Speed of Cyl #3
   Engine Speed of Cyl #4
   Engine Speed of Cyl #5
   Engine Speed of Cyl #6
   Av Engine Speed of All Cyl

   HINT: 

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

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

   HINT: 

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

9. While the engine is not running, press the Active button to change Check the Cylinder Compression to "ON".

   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.

10. Crank the engine.

    HINT: 

    Continue to crank the engine until the values change from the default value (51199 rpm).

11. Monitor the engine speed (Engine Speed of Cyl and Av Engine Speed of All Cyl) displayed on the Techstream.
    NOTE:

    • If the Check the Cylinder Compression Active Test needs to be performed after it is changed to "ON" and performed once, press the Exit button to return to the Active Test menu screen. Then perform the Check the Cylinder Compression Active Test again.
    • As soon as the measurements are obtained, stop the Active Test.

    HINT: 

    • At first, the Techstream display will show each cylinder's engine speed measurement to be extremely high. After the engine has started, each cylinder's engine speed measurement will change to the actual engine speed.
    • If the cylinder engine speed values (Engine Speed Cylinder #1 to #6) 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 "ON" and crank the engine again within 1 second.
12. Stop the engine and change the Active Test "Check the Cylinder Compression" to "ON" after the engine stops.
    NOTE:

    • When performing the Active Test, DTC P1604 (startability malfunction) may be stored.
    • After performing the Active Test, make sure to check and clear the DTCs.
13. Push the snapshot button to turn the snapshot function off.
14. Read the value.

    HINT: 

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

    Result

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

Result:  2

B 

See step  12

Result:  1

A 

See step  8

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Turn the Techstream on.
4. Put the engine in inspection mode (maintenance mode).

   Powertrain > Hybrid Control > Utility 

   Tester Display
   Inspection Mode

5. Start the engine and warm it up until the engine coolant temperature 75°C (167°F) or higher with all the accessories switched off.
6. Idle the engine.
7. Enter the following menus: Powertrain / Engine and ECT / Active Test / D-4S (Injection Volume).

   Powertrain > Engine and ECT > Active Test 

   Tester Display
   D-4S (Injection Volume)

8. According to the display on the Techstream, perform the Active Test and check the vehicle conditions when increasing and decreasing the fuel injection volume.

   HINT: 

   • Increase and decrease the fuel injection volume of the port injection and direct injection simultaneously and check the vehicle condition.
   • Change the fuel injection volume between the minimum and maximum range of correction (e.g. -12.5% to 24.8%).

   Result

   Result	Proceed to
   Malfunction is still present even if the fuel injection volume is changed	A
   Malfunction disappears when the fuel injection volume is changed	B

Result:  2

B 

See step  11

Result:  1

A 

See step  9

1. Check the ignition system.

   HINT: 

   • Interchange the ignition coil assembly and spark plug of the malfunctioning cylinder with those of a known good cylinder and check if the malfunctioning cylinder returns to normal.
   • If the spark plug of the malfunctioning cylinder is abnormally wet with fuel even after the ignition coil assembly and spark plug are replaced, a leaking fuel injector assembly is suspected.

   Result

   Result	Proceed to
   The malfunctioning cylinder does not return to normal	A
   The malfunctioning cylinder returned to normal	B

Result:  2

B 

See step  23

Result:  1

A 

See step  10

1. Check the power source circuit, wire harness and connectors.

NEXT 

See step  23

1. Replace the fuel injector assembly of the malfunctioning cylinder.

   HINT: 

   • If the air fuel ratio learned value is corrected to the positive side for all operating ranges due to low fuel injector assembly injection volume, replace the fuel injector assemblies of all cylinders.
   • Perform "Inspection After Repair" after replacing the fuel injector assembly.

     Refer to INITIALIZATION [11/2016 - ]

   • When the symptom tends to improve by decreasing the fuel injection amount, blockage of the EGR port causes EGR distribution to worsen, EGR becomes excessive on the cylinders with little EGR port blockage, and this may lead to unsatisfactory firing.

NEXT 

See step  24

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

NEXT 

See step  23

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Turn the Techstream on.
4. Put the engine in inspection mode (maintenance mode).

   Powertrain > Hybrid Control > Utility 

   Tester Display
   Inspection Mode

5. Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher.

   HINT: 

   The A/C switch and all accessory switches should be off.

6. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the EGR Step Position / Data List / MAP and Throttle Idle Position.

   Powertrain > Engine and ECT > Active Test 

   Active Test Display
   Control the EGR Step Position

   Data List Display
   MAP
   Throttle Idle Position

7. Confirm that the Throttle Idle Position is ON and check the MAP values in the Data List while performing the Active Test.

   HINT: 

   • Do not leave the EGR valve open for 10 seconds or more during the Active Test.
   • Be sure to return the EGR valve to step 0 when the Active Test is completed.
   • Do not open the EGR valve 30 steps or more during the Active Test.

   Result

   Result	Proceed to
   MAP increases by less than 10 kPa (1.45 psi) when the EGR valve is fully closed (0 step)	A
   MAP increases by 10 kPa (1.45 psi) or more when the EGR valve is fully closed (0 step)	B

   HINT: 

   • While performing the Active Test, if the increase in the value of MAP is small, the EGR valve assembly may be a malfunctioning.
   • Even if the EGR valve assembly is malfunctioning, rough idling or an increase in the value of MAP may occur while performing the Active Test. However, the amount that the value of MAP increases will be smaller than normal.

Result:  1

B 

See step  15

Result:  2

A 

See step  14

1. Replace the EGR valve assembly.

   Refer to REMOVAL [11/2016 - ]

   HINT: 

   Perform "Inspection After Repair" after replacing the EGR valve assembly.

   Refer to INITIALIZATION [11/2016 - ]

NEXT 

See step  24

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Turn the Techstream on.
4. Put the engine in inspection mode (maintenance mode).

   Powertrain > Hybrid Control > Utility 

   Tester Display
   Inspection Mode

5. Start the engine and warm it up until the engine coolant temperature 75°C (167°F) or higher with all the accessories switched off.
6. Enter the following menus: Powertrain / Engine and ECT / Data List / MAF.

   Powertrain > Engine and ECT > Data List 

   Tester Display
   MAF

7. According to the display on the Techstream.

   HINT: 

   During charge control, the engine speed is set at idle. Therefore, the engine speed does not increase when depressing the accelerator pedal. In this case, read the Data List item after charge control has completed.

   Result

   Result	Proceed to
   Idling (without load): 3.0 to 5.0 gm/sec	A
   Engine speed 2500 rpm (without load): 8.0 to 12.5 gm/sec
   Other than above	B

Result:  2

B 

See step  22

Result:  1

A 

See step  16

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Turn the Techstream on.
4. Put the engine in inspection mode (maintenance mode).

   Powertrain > Hybrid Control > Utility 

   Tester Display
   Inspection Mode

5. Start the engine and warm it up until the engine coolant temperature 75°C (167°F) or higher with all the accessories switched off.
6. Idle the engine for 5 minutes or more with the shift lever in P.
7. Idle the engine.
8. Enter the following menus: Powertrain / Engine and ECT / Active Test / D-4S (Injection Volume) / Data List / AFS Voltage B1S1, AFS Voltage B2S1, O2S B1S2 and O2S B2S2.

   Powertrain > Engine and ECT > Active Test 

   Active Test Display
   D-4S (Injection Volume)

   Data List Display
   AFS Voltage B1S1
   AFS Voltage B2S1
   O2S B1S2
   O2S B2S2

9. According to the display on the Techstream, perform the Active Test and check the vehicle conditions when increasing and decreasing the fuel injection volume of port injection and direct injection.
   NOTE:

   • The air fuel ratio sensor has an output delay of a few seconds and the heated oxygen sensor has a maximum output delay of approximately 20 seconds.
   • Read the output voltage immediately after warming up the air fuel ratio sensor and heated oxygen sensor to avoid an inaccurate reading due to a sensor cooling.

   HINT: 

   • Increase and decrease the fuel injection volume of the port injection and direct injection simultaneously and check the vehicle condition.
   • Change the fuel injection volume between -12.5% and 12.5%.

   Standard

   Techstream Display (Sensor)	Injection Volume	Voltage
   AFS Voltage B1S1 AFS Voltage B2S1 (Air fuel ratio)	12.5%	Below 3.1 V
   	-12.5%	Higher than 3.4 V
   O2S B1S2 O2S B2S2 (Heated oxygen)	12.5%	Higher than 0.55 V
   	-12.5%	Below 0.4 V

   Result

   Result	Proceed to
   Malfunction disappears when fuel injection volume is increased	A
   Malfunction is still present when fuel injection volume is increased, even if output voltage values are normal	B
   Output voltage values are abnormal	C

Result:  2

B 

See step  20

Result:  3

C 

See step  21

Result:  1

A 

See step  17

1. Replace the fuel injector assemblies of all cylinders.

   HINT: 

   Perform "Inspection After Repair" after replacing the fuel injector assembly.

   Refer to INITIALIZATION [11/2016 - ]

NEXT 

See step  24

1. Clean off any deposits from the inside of the throttle body with motor assembly.
2. Push open the throttle valve and wipe off any carbon from the valve and bore using a piece of cloth soaked in non-residue solvent.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *1	Throttle Body with Motor Assembly	*2	Bore
   *3	Valve	-	-
   *a	Reference	*b	Throttle Body with Motor Assembly Cross-section Diagram
   *c	When valve fully opened	*d	Do not directly apply cleaner
   *e	Deposits	-	-

   NOTE:

   • Make sure that the cloth or your fingers do not get caught in the valve.
   • Make sure that foreign matter does not enter the throttle valve.
   • Do not directly apply non-residue solvent to the throttle body with motor assembly or wash the throttle body with motor assembly. Cleaning solvent may leak into the motor from the shaft and cause problems such as rust or valve movement problems.
   • If there is coating material on the edge of the valve, be careful not to remove it.

   HINT: 

   The illustrations are for reference only. Actual parts may differ.

NEXT 

1. Perform "Inspection After Repair" after cleaning the throttle body with motor assembly.

   Refer to INITIALIZATION [11/2016 - ]

2. Connect the Techstream to the DLC3.
3. Turn the power switch on (IG).
4. Turn the Techstream on.
5. Put the engine in inspection mode (maintenance mode).

   Powertrain > Hybrid Control > Utility 

   Tester Display
   Inspection Mode

6. Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher.
7. Allow the engine to idle for 3 minutes or more and confirm that the engine speed is within the specified range.

   HINT: 

   If the engine is operated without performing learning value reset and idle learning after cleaning the deposits from the throttle body with motor assembly, the idle speed may increase.

NEXT 

See step  24

1. Inspect other related components.

   HINT: 

   If the malfunctioning part could not be determined by performing the preceding inspections, one of the following malfunctions is suspected.

   • Engine mount deterioration
   • Deposits in the intake manifold, intake air surge tank assembly or on an intake valve
   • EGR distribution worsens due to EGR port blockage
   • Delay in fuel supply due to adherence of the fuel to the deposits

NEXT 

See step  23

1. Replace the air fuel ratio sensor.

   Refer to REMOVAL [11/2016 - ]

   HINT: 

   Perform "Inspection After Repair" after replacing the air fuel ratio sensor.

   Refer to INITIALIZATION [11/2016 - ]

2. Replace the heated oxygen sensor.

   Refer to REMOVAL [11/2016 - ]

   HINT: 

   Perform "Inspection After Repair" after replacing the heated oxygen sensor.

   Refer to INITIALIZATION [11/2016 - ]

NEXT 

See step  24

1. Check for air leaks or blockage in the intake system components. If a connection problem or foreign matter is found, repair the connection or remove the foreign matter.

   HINT: 

   • If there is foreign matter in the intake system components, remove it before proceeding to the next step.
   • If there is no foreign matter in the intake system components, check for foreign matter in the mass air flow meter sub-assembly. If there is foreign matter in the mass air flow meter sub-assembly, remove it.

NEXT 

1. Repair or replace the malfunctioning part.
2. Perform "Inspection After Repair" after repairing or replacing the malfunctioning part.

   Refer to INITIALIZATION [11/2016 - ]

NEXT 

1. Check that the idle has returned to normal.

NEXT 

END