Inspection Procedure

WARNING: This page is about a different car, the 2008 Lexus IS F. However, it is still accessible from the selected car via links, so may be relevant.

HINT

If any DTCs other than misfire DTCs are output, troubleshoot those DTCs first.
Read freeze frame data using the Techstream The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction
If the misfire does not recur when the vehicle is brought to the workshop, reproduce the conditions stored in the ECM as freeze frame data
If the misfire still cannot be reproduced even though the conditions stored in the ECM as freeze frame data have been reproduced, one of the following factors is considered to be a possible cause of the problem
1. There was insufficient fuel in the tank
2. Improper fuel is used.
3. The spark plugs have been contaminated
4. The problem requires further diagnosis
After finishing repairs, check the misfire counts of the cylinders (Cylinder #1 Misfire Count to Cylinder #8 Misfire Count)
Be sure to confirm that no misfiring cylinder DTCs are set again by conducting the confirmation driving pattern after finishing repairs
For 8 cylinder engine, the ECM intentionally does not set the specific misfiring cylinder DTCs at high engine speed If misfires occur only in high engine speed areas, only DTC P0300 is set
In the event of DTC P0300 being present, perform the following operations
1. Clear DTCs (See DTC CHECK/CLEAR )
2. Start the engine and conduct the confirmation driving pattern.
3. Read the misfire count of each cylinder or DTC(s) using the Techstream
4. Repair the cylinder(s) that has a high misfiring count or is indicated by the DTC
5. After finishing repairs, conduct the confirmation driving pattern again, in order to verify that DTC P0300 is not set.
When one of Short FT #1, Long FT #1, Short FT #2 or Long FT #2 in the freeze frame data is outside the range of +1-20%, the air fuel ratio may be Rich (-20% or less) or Lean (+20% or more)
When the Coolant Temp in the freeze frame data is less than 75°C (167°F), the misfire have occurred only while warming up the engine
An extremely imbalanced drive wheel which causes body vibration may cause misfire DTCs to be detected

CHECK ANY OTHER DTC OUTPUT (IN ADDITION TO MISFIRE DTCS)

Connect the Techstream to the DLC3.
Turn the engine switch on (IG)
Turn the Techstream ON
Enter the following menus Powertrain / Engine / Trouble Codes.

Read the DTCs

Result

RESULT CHART

Result	Proceed to
DTC P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307 and/or P0308 are output	A
DTC P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307 and/or P0308 and other DTCs are output	B

HINT

If any DTCs other than P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307 and P0308 are output, troubleshoot those DTCs first

B: GO TO DTC CHART (See DIAGNOSTIC TROUBLE CODE CHART )

A: Go to Next Step

READ VALUE USING TECHSTREAM (MISFIRE RPM AND MISFIRE LOAD)
1. Connect the Techstream to the DLC3
2. Turn the engine switch on (IG) and turn the Techstream ON
3. Enter the following menus Powertrain / Engine / Data List / Misfire / Misfire RPM and Misfire Load
4. Read and note the Misfire RPM and Misfire Load values
  HINT
  
  The Misfire RPM and Misfire Load values indicate the vehicle conditions under which the misfire occurred
CHECK PCV HOSE (HOSE CONNECTIONS)
OK: PCV hose is connected correctly and is not damaged.

NG: REPAIR OR REPLACE PCV HOSE (See REMOVAL )

OK: Go to Next Step

CHECK MISFIRE COUNT OF PORT INJECTION

Connect the Techstream to the DLC3
Turn the engine switch on (IG)
Turn the Techstream ON
Clear DTCs (See DTC CHECK/CLEAR ).
Enter the following menus- Powertrain / Engine / Active Test / Control the Injection Way / Port (Procedure "A")
Allow the engine to idle.

Monitor all of the misfire count values that are displayed on the Techstream. Powertrain / Engine / Data List / Misfire / Cylinder #1 Misfire Count to Cylinder #8 Misfire Count

If no misfire counts occur for any of the cylinders, perform the following procedure: (Procedure "B")

Move the shift lever to D
Repeat procedure "A" to "B" above.

Monitor all of the misfire count values that are displayed on the tester.

Result

RESULT CHART

Misfire count	Proceed to
There are no misfire counts	A
1 or 2 cylinders have misfire counts	B
3 cylinders or more have misfire counts	B

B: Go to step 7

A: Go to Next Step

CHECK MISFIRE COUNT OF DIRECT INJECTION

Connect the Techstream to the DLC3.
Turn the engine switch on (IG).
Turn the Techstream ON
Clear DTCs (See DTC CHECK/CLEAR ).
Enter the following menus Powertrain / Engine / Active Test / Control the Injection Way / Direct. (Procedure "A")
Allow the engine to idle.

Monitor all of the misfire count values that are displayed on the Techstream

Enter the following menus Powertrain / Engine / Data List / Misfire / Cylinder #1 Misfire Count Cylinder #8 Misfire Count
If no misfire counts occur for any of the cylinders, perform the following procedure (Procedure "B")

Move the shift lever to D
Repeat procedure "A" to "B" above

Monitor all of the misfire count values that are displayed on the Techstream

Result

RESULT CHART

Misfire Count		Proceed to
Port	Direct	Proceed to
There are no misfire counts	1 or 2 cylinders have misfire counts	A
There are no misfire counts	3 cylinders or more have misfire counts	B
There are no misfire counts	There are no misfire counts	C

B: Go to step 27

C: Go to step 6

A: REPLACE FUEL INJECTOR ASSEMBLY (FOR DIRECT INJECTION) (See REMOVAL )

CHECK MISFIRE COUNT

Connect the Techstream to the DLC3
Turn the engine switch on (IG)
Turn the Techstream ON
Clear DTCs (See DTC CHECK/CLEAR )
Enter the following menus. Powertrain / Engine / Data List / Misfire RPM, Misfire Load, Cylinder #1 Misfire Count to Cylinder #8 Misfire Count and Injection Way
Drive the vehicle with Misfire RPM and Misfire Load

Monitor all of the misfire count values or DTCs and Injection Way displayed on the Techstream

Result

RESULT CHART

Misfire count	Injection Way	Proceed to
There are no misfire counts	-	A
1 or 2 cylinders have misfire counts	Port or Either	B
3 cylinders or more have misfire counts	Port or Either	C
1 or 2 cylinders have misfire counts	Direct	D
3 cylinders or more have misfire counts	Direct	E

B: Go to step 8

C: Go to step 17

D: REPLACE FUEL INJECTOR ASSEMBLY (FOR DIRECT INJECTION MALFUNCTIONING CYLINDER) (See REMOVAL )

E: Go to step 27

A: CHECK FOR INTERMITTENT PROBLEMS (See CHECK FOR INTERMITTENT PROBLEMS )

CHECK MISFIRE COUNT

Connect the Techstream to the DLC3.
Turn the engine switch on (IG)
Turn the Techstream ON
Clear DTCs (See DTC CHECK/CLEAR )
Enter the following menus Powertrain / Engine / Active Test / Control the Injection Way / Direct (Procedure "A")
Allow the engine to idle

Monitor all of the misfire count values that are displayed on the Techstream Powertrain / Engine / Data List / Misfire / Cylinder #1 Misfire Count to Cylinder #8 Misfire Count

If no misfire counts occur for any of the cylinders, perform the following procedure (Procedure "B")

Move the shift lever to D
Repeat procedure "A" to "B" above

Monitor all of the misfire count values that are displayed on the Techstream

Result

RESULT CHART

Misfire Count		Proceed to
Port	Direct	Proceed to
1 or 2 cylinders have misfire counts	1 or 2 cylinders have misfire counts	A
3 cylinders or more have misfire counts	3 cylinders or more have misfire counts	B
1 or 2 cylinders have misfire counts	There are no misfire counts	C
3 cylinders or more have misfire counts	There are no misfire counts	D

B: Go to step 17

C: REPLACE INJECTOR ASSEMBLY (MALFUNCTIONING CYLINDER) (See REMOVAL )

D: Go to step 26

A: Go to Next Step

CHECK SPARK PLUG

Remove the ignition coil and the spark plug of the misfiring cylinder
Measure the spark plug electrode gap
Standard gap: 1.0 to 1.1 mm (0.039 to 0.043 in.)

Check the electrode for carbon deposits.

Recommended Spark Plug

SPARK PLUG REFERENCE CHART

Manufacturer	Product
DENSO	FK20HBR11

Fig 1: Identifying Spark Plug Electrode Gap

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NOTE: If the electrode gap is larger than standard, replace the spark plug. Do not adjust the electrode gap.

Reinstall the ignition coil and spark plug.

NG: REPLACE SPARK PLUG (See REMOVAL )

OK: Go to Next Step

CHECK FOR SPARK AND IGNITION
1. Remove the ignition coil assemblies
2. Remove the spark plugs
3. Install the spark plug to the ignition coil
4. Disconnect the 2 fuel delivery pipe connectors
5. Disconnect the 4 connectors with wire harness locks from the 2 injector drivers
6. Attach the spark plug assembly to the cylinder head cover
  
  Fig 2: Locating Fuel Delivery Pipe Connectors And Wire Harness Locks Connectors
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
7. Crank the engine for less than 2 seconds and check the spark
  OK: Sparks jump across the electrode gap.
8. Reconnect the 4 connectors with wire harness locks to the 2 injector drivers
9. Reconnect the 2 fuel delivery pipe connectors
10. Reinstall the spark plugs
11. Reinstall the ignition coil assemblies
NG: Go to step 29

OK: Go to Next Step
CHECK CYLINDER COMPRESSION PRESSURE (MALFUNCTIONING CYLINDER)
1. Measure the cylinder compression pressure of the misfiring cylinder (See DRIVE BELT )
NG: CHECK ENGINE TO DETERMINE CAUSE OF LOW COMPRESSION

OK: Go to Next Step
CHECK VALVE CLEARANCE (MISFIRING CYLINDER)
1. Check the valve clearance (See VALVE CLEARANCE )
NG: ADJUST VALVE CLEARANCE (See VALVE CLEARANCE )

OK: Go to Next Step
CHECK INTAKE SYSTEM
1. Check the intake system for vacuum leaks (See ON-VEHICLE INSPECTION ).
  OK: No leaks in the intake system.
NG: REPAIR OR REPLACE INTAKE SYSTEM (See REMOVAL )

OK: Go to Next Step
CHECK VALVE TIMING

Fig 4: Identifying Valve Timing Mark
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. Remove the cylinder head cover bank 1 and bank 2
2. Turn the crankshaft pulley, and align its groove with the timing mark "0" of the timing chain cover.
3. Check that the timing marks of the camshaft timing gears and camshaft timing exhaust gears are at the positions shown in the illustration.
  OK: Timing marks on camshaft timing gears are aligned as shown in the illustration.
4. Reinstall the cylinder head covers
NG: ADJUST VALVE TIMING

OK: Go to Next Step
CHECK FUEL PRESSURE (LOW PRESSURE SIDE)
1. Check the fuel pressure (low pressure side) (See ON-VEHICLE INSPECTION )
NG: Go to step 31

OK: Go to Next Step
READ VALUE USING TECHSTREAM (COOLANT TEMP)
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 / Data List / Coolant Temp
5. Read the Data List twice, when the engine is both cold and warmed up.
  Standard: With cold engine:
  
  Same as ambient air temperature.
  
  With warm engine:
  
  Between 75°C and 95°C (167°F and 203°F).
NG: REPLACE ENGINE COOLANT TEMPERATURE SENSOR (See REMOVAL )

OK: Go to Next Step
INSPECT MASS AIR FLOW METER SUB-ASSEMBLY
1. Inspect the mass air flow meter sub-assembly (See REMOVAL ).
NG: REPLACE MASS AIR FLOW METER SUB-ASSEMBLY (See REMOVAL )

OK: REPLACE ECM (See REMOVAL )
CHECK INTAKE SYSTEM
1. Check the intake system for vacuum leaks (See ON-VEHICLE INSPECTION )
  OK: No leaks in the intake system.
NG: REPAIR OR REPLACE INTAKE SYSTEM (See REMOVAL )

OK: Go to Next Step
CHECK VALVE TIMING

Fig 5: Identifying Valve Timing Mark
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. Remove the cylinder head cover bank 1 and bank 2.
2. Turn the crankshaft pulley, and align its groove with the timing mark "0" of the timing chain cover.
3. Check that the timing marks of the camshaft timing gears and camshaft timing exhaust gears are at the positions shown in the illustration
  OK: Timing marks on camshaft timing gears are aligned as shown in the illustration.
4. Reinstall the cylinder head covers
NG: ADJUST VALVE TIMING

OK: Go to Next Step
CHECK FUEL PRESSURE (LOW PRESSURE SIDE)
1. Check the fuel pressure (low pressure side) (See ON-VEHICLE INSPECTION )
NG: Go to step 31

OK: Go to Next Step
READ VALUE USING TECHSTREAM (COOLANT TEMP)
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 / Data List/Coolant Temp
5. Read the Data List twice when the engine is both cold and warmed up.
  Standard: With cold engine:
  
  Same as ambient air temperature.
  
  With warm engine: Between 75°C and 95°C (167°F and 203°F).
NG: REPLACE ENGINE COOLANT TEMPERATURE SENSOR (See REMOVAL )

OK: Go to Next Step
INSPECT MASS AIR FLOW METER SUB-ASSEMBLY
1. Inspect the mass air flow meter sub-assembly (See REMOVAL )
NG: REPLACE MASS AIR FLOW METER SUB-ASSEMBLY (See REMOVAL )

OK: Go to Next Step

CHECK SPARK PLUG

Remove the ignition coil and the spark plug of the misfiring cylinder
Measure the spark plug electrode gap.
Standard gap: 1.0 to 1.1 mm (0.039 to 0.043 in.)

Check the electrode for carbon deposits

Recommended Spark Plug

SPARK PLUG REFERENCE CHART

Manufacturer	Product
DENSO	FK20HBR11

Fig 6: Identifying Spark Plug Electrode Gap

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NOTE: If the electrode gap is larger than standard, replace the spark plug. Do not adjust the electrode gap.

Reinstall the ignition coil and spark plug.

NG: REPLACE SPARK PLUG (See REMOVAL )

OK: Go to Next Step

CHECK FOR SPARK AND IGNITION
1. Remove the ignition coil assemblies.
2. Remove the spark plugs.
3. Install the spark plug to the ignition coil
4. Disconnect the 2 fuel delivery pipe connectors.
5. Disconnect the 4 connectors with wire harness locks from the 2 injector drivers.
6. Attach the spark plug assembly to the cylinder head cover.
  
  Fig 7: Locating Fuel Delivery Pipe Connectors And Wire Harness Locks Connectors
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
7. Crank the engine for less than 2 seconds and check the spark.
  OK: Sparks jump across the electrode gap.
8. Reconnect the 4 connectors with wire harness locks to the 2 injector drivers.
9. Reconnect the 2 fuel delivery pipe connectors
10. Reinstall the spark plugs
11. Reinstall the ignition coil assemblies.
NG: Go to step 29

OK: Go to Next Step
CHECK CYLINDER COMPRESSION PRESSURE (MALFUNCTIONING CYLINDER)
1. Measure the cylinder compression pressure of the misfiring cylinder (See ENGINE ).
NG: CHECK ENGINE TO DETERMINE CAUSE OF LOW COMPRESSION

OK: Go to Next Step
CHECK VALVE CLEARANCE (MISFIRING CYLINDER)
1. Check the valve clearance (See VALVE CLEARANCE )
NG: ADJUST VALVE CLEARANCE (See VALVE CLEARANCE )

OK: REPLACE ECM (See REMOVAL )
CHECK FUEL PRESSURE (LOW PRESSURE SIDE)
1. Check the fuel pressure (low pressure side) (See ON-VEHICLE INSPECTION )
NG: Go to step 31

OK: REPLACE FUEL INJECTOR ASSEMBLY (FOR PORT INJECTION) (See REMOVAL )
CHECK FUEL PRESSURE SENSOR
1. Connect the Techstream to the DLC3
2. Turn the engine switch on (IG) and turn the Techstream ON
3. Start the engine.
4. Enter the following menus Powertrain / Engine / Data List / Fuel Press
5. While revving the engine, check that the fuel pressure fluctuates.
  Standard: Idling:
  
  3.5 to 4.5 MPa
  
  2000 rpm (No load):
  
  7 to 9 MPa
  
  HINT
  
  The A/C switch and all accessory switches should be OFF, and the shift lever should be in N or P, and the engine should be fully warmed up
NG: Go to step 33

OK: Go to Next Step

READ VALUE USING TECHSTREAM

Connect the Techstream to the DLC3
Start the engine and turn the Techstream ON.
Enter the following menus. Powertrain / Engine / Active Test / Control the Injection way / Direct
HINT

The A/C switch and all accessory switches should be OFF, and the shift lever should be in N or P, and the engine should be fully warmed up

Read the value

Enter the following menus. Data List / A/F Control System / Short FT #1, Long FT #1, Short FT #2, Long FT #2 and Fuel Pump Duty (D4)

Result

RESULT CHART

Item			Proceed to
Fuel Pump Duty (D4)	Short FT #1 + Long FT #1	Short FT #2 + Long FT #2	Proceed to
40% or more	-20% or less	-20% or less	A
10% or less	+20% or more	+20% or more	A
40% or more	+20% or more	+20% or more	B
10% or less	-20% or less	-20% or less	C
10% to 40%	-	-	D

B: REPLACE FUEL PRESSURE SENSOR (See REMOVAL )

C: REPLACE ECM (See REMOVAL )

D: REPLACE FUEL INJECTOR ASSEMBLY (FOR DIRECT INJECTION MALFUNCTIONING CYLINDER) (See REMOVAL )

A: REPLACE FUEL PRESSURE SENSOR (See REMOVAL )

CHANGE TO NORMAL SPARK PLUG AND CHECK SPARK OF MISFIRING CYLINDER
1. Change the installed spark plug to a spark plug that functions normally.
2. Perform a spark test.
  CAUTION: Always disconnect each injector connector.
  
  NOTE: Do not crank the engine for more than 2 seconds.
  1. Install the spark plug to the ignition coil and connect the ignition coil connector
  2. Disconnect the 2 fuel delivery pipe connectors
  3. Disconnect the 4 connectors with wire harness locks from the 2 injector drivers.
  4. Ground the spark plug
  5. Check if sparks occur while the engine is being cranked
    OK: Sparks jump across the electrode gap.
  Fig 9: Locating Fuel Delivery Pipe Connectors And Wire Harness Locks Connectors
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NG: Go to step 30

OK: REPLACE SPARK PLUG (See REMOVAL )
CHANGE TO NORMAL IGNITION COIL AND SPARK OF MISFIRING CYLINDER
1. Change the installed ignition coil to a ignition coil that functions normally
2. Perform a spark test
  CAUTION: Always disconnect each injector connector.
  
  NOTE: Do not crank the engine for more than 2 seconds.
  1. Install the spark plug to the ignition coil and connect the ignition coil connector
  2. Disconnect the 2 fuel delivery pipe connectors
  3. Disconnect the 4 connectors with wire harness locks from the 2 injector drivers
  4. Ground the spark plug
  5. Check if sparks occur while the engine is being cranked
    OK: Sparks jump across the electrode gap.
NG: REPLACE ECM (See REMOVAL )

OK: REPLACE IGNITION COIL ASSEMBLY (See REMOVAL )
CHECK FUEL PUMP OPERATION
1. Check the fuel pump operation (See ON-VEHICLE INSPECTION )
NG: REPAIR OR REPLACE FUEL PUMP CONTROL CIRCUIT (See FUEL PUMP CONTROL CIRCUIT )

OK: Go to Next Step
CHECK FUEL LINE
1. Check the fuel line for leakage and blockage
NG: REPAIR OR REPLACE FUEL LINE

OK: CHECK AND REPLACE FUEL SYSTEM (FUEL PUMP REGULATOR, FUEL FILTER)

CHECK MISFIRE COUNT

Connect the Techstream to the DLC3.
Turn the engine switch on (IG) and turn the Techstream ON
Start the engine
Enter the following menus Powertrain / Engine / Active Test / Control the Injection Way / Direct.
Allow the engine to idle

Monitor all of the misfire count values that are displayed on the Techstream Powertrain / Engine / Data List / Misfire / Cylinder #1 Misfire Count to Cylinder #8 Misfire Count

If no misfire counts occur for any of the cylinders, perform the following procedure.

Move the shift lever to D

Monitor all of the misfire count values that are displayed on the Techstream

Result

RESULT CHART

Misfire Count	Proceed to
No misfire counts, or misfire counts occur randomly in all cylinders	A
Misfire counts occur in particular cylinder	B

B: REPLACE FUEL INJECTOR ASSEMBLY (FOR DIRECT INJECTION) (See REMOVAL )

A: Go to Next Step

INSPECT INJECTOR DRIVER

Turn the engine switch off.
Replace the No. 1 and No. 2 injector drivers with normal ones from another vehicle.
NOTE: Do not disconnect and reconnect the connectors with the engine switch on (IG), as the injector driver (EDU) may be damaged.
Connect the Techstream to the DLC3
Start the engine
Clear DTCs (See DTC CHECK/CLEAR ).
Perform the driving test
Enter the following menus Powertrain / Engine / Trouble Codes

Read the DTCs.

Result

RESULT CHART

Result	Proceed to
DTC P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307 and/or P0308 are output	A
DTC is not output	B

B: REPLACE INJECTOR DRIVER (NO. 1 AND NO. 2) (See REMOVAL )

A: Go to Next Step

INSPECT FUEL RELIEF VALVE ASSEMBLY

Connect the Techstream to the DLC3.
Turn the engine switch on (IG) and turn the Techstream ON.
Start the engine.
Enter the following menus Powertrain / Engine / Data List / Fuel Press
Record the Fuel Press value
Turn the engine switch off
Wait for 10 seconds
Turn the engine switch on (IG) and turn the Techstream ON.
Enter the following menus. Powertrain / Engine / Data List / Fuel Press

Compare the Fuel Press value recorded with the engine running to the Fuel Press value currently shown on the Techstream

Result

RESULT CHART

Inspection Result	Proceed to
Fuel Press value drops	A
Fuel Press value is maintained	B

B: REPLACE FUEL RELIEF VALVE ASSEMBLY (See REMOVAL )

A: REPLACE FUEL PUMP ASSEMBLY (HIGH PRESSURE) (See REMOVAL )