Part 2
1UR-FSE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0300-P0308: Random / Multiple Cylinder Misfire Detected
DTC P0300 - Random / Multiple Cylinder Misfire Detected
DTC P0301 - Cylinder 1 Misfire Detected
DTC P0302 - Cylinder 2 Misfire Detected
DTC P0303 - Cylinder 3 Misfire Detected
DTC P0304 - Cylinder 4 Misfire Detected
DTC P0305 - Cylinder 5 Misfire Detected
DTC P0306 - Cylinder 6 Misfire Detected
DTC P0307 - Cylinder 7 Misfire Detected
DTC P0308 - Cylinder 8 Misfire Detected
(Continued)
17. READ VALUE USING TECHSTREAM (MAF)
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Turn the Techstream on.
(d) Enter the following menus: Powertrain / Engine / Data List / All Data / MAF and Coolant Temp.
(e) Allow the engine to idle until Coolant Temp reaches 75°C (167°F) or higher.
(f) Read MAF with the engine speed at 3000 rpm.
Standard:
Between 18 g/sec. and 22 g/sec. (shift lever: N; A/C: Off).
NG -- CHECK HARNESS AND CONNECTOR
OK -- REPLACE ECM Removal
18. CHECK INTAKE SYSTEM
(a) Check the intake system for vacuum leaks.
OK:
No leaks in the intake system.
NG -- REPAIR OR REPLACE INTAKE SYSTEM
OK -- Continue to next step.
19. CHECK VALVE TIMING P0016
NG -- ADJUST VALVE TIMING
OK -- Continue to next step.
20. CHECK FUEL PRESSURE (LOW PRESSURE SIDE)
(a) Check the fuel pressure (low pressure side) Fuel System.
NG -- CHECK FUEL PUMP OPERATION
OK -- Continue to next step.
21. READ VALUE USING TECHSTREAM (COOLANT TEMP)
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Turn the Techstream on.
(d) Enter the following menus: Powertrain / Engine / Data List / Coolant Temp.
(e) 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 Components
OK -- Continue to next step.
22. READ VALUE USING TECHSTREAM (MAF)
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Turn the Techstream on.
(d) Enter the following menus: Powertrain / Engine / Data List / All Data / MAF and Coolant Temp.
(e) Allow the engine to idle until Coolant Temp reaches 75°C (167°F) or higher.
(f) Read MAF with the engine speed at 3000 rpm.
Standard:
Between 18 g/sec. and 22 g/sec. (shift lever: N; A/C: Off).
NG -- CHECK HARNESS AND CONNECTOR
OK -- Continue to next step.
23. CHECK SPARK PLUG
(a) Inspect the spark plug Testing and Inspection.
NG -- REPLACE SPARK PLUG Removal
OK -- Continue to next step.
24. CHECK FOR SPARK AND IGNITION
(a) Remove the ignition coil assemblies.
(b) Remove the spark plugs.
(c) Install the spark plug to the ignition coil.
(d) Disconnect the 2 fuel delivery pipe connectors.
(e) Disconnect the 4 connectors with wire harness locks from the 2 injector drivers.
(f) Attach the spark plug assembly to the cylinder head cover.
(g) Crank the engine for less than 2 seconds and check the spark.
OK:
Sparks jump across the electrode gap.
(h) Reconnect the 4 connectors with wire harness locks to the 2 injector drivers.
(i) Reconnect the 2 fuel delivery pipe connectors.
(j) Reinstall the spark plugs.
(k) Reinstall the ignition coil assemblies.
NG -- CHANGE TO NORMAL SPARK PLUG AND CHECK SPARK OF MISFIRING CYLINDER
OK -- Continue to next step.
25. CHECK CYLINDER COMPRESSION PRESSURE (MALFUNCTIONING CYLINDER)
(a) Measure the cylinder compression pressure of the misfiring cylinder Engine.
NG -- CHECK ENGINE TO DETERMINE CAUSE OF LOW COMPRESSION
OK -- REPLACE ECM Removal
26. CHECK FUEL PRESSURE (LOW PRESSURE SIDE)
(a) Check the fuel pressure (low pressure side) Fuel System.
NG -- CHECK FUEL PUMP OPERATION
OK -- REPLACE FUEL INJECTOR ASSEMBLY (FOR PORT INJECTION) Components
27. CHECK FUEL PRESSURE SENSOR
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG) and turn the Techstream on.
(c) Start the engine.
(d) Enter the following menus: Powertrain / Engine / Data List / Fuel Press.
(e) While revving the engine, check that the fuel pressure fluctuates.
Standard:
Idling
3000 to 5000 kPa
2000 rpm (No load)
7000 to 9000 kPa
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 -- CHECK MISFIRE COUNT
OK -- Continue to next step.
28. READ VALUE USING TECHSTREAM
(a) Connect the Techstream to the DLC3.
(b) Start the engine and turn the Techstream on.
(c) 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.
(d) Read the value.
(1) Enter the following menus: Data List / All Data / Short FT #1, Long FT #1, Short FT #2, Long FT #2 and Fuel Pump Duty (D4).
Result:
D -- REPLACE FUEL INJECTOR ASSEMBLY (FOR DIRECT INJECTION MALFUNCTIONING CYLINDER) Components
C -- REPLACE ECM Removal
B -- INSPECT FUEL RELIEF VALVE ASSEMBLY
A -- REPLACE FUEL PRESSURE SENSOR Removal
29. CHANGE TO NORMAL SPARK PLUG AND CHECK SPARK OF MISFIRING CYLINDER
(a) Change the installed spark plug to a spark plug that functions normally.
(b) Perform a spark test.
CAUTION:
Always disconnect each injector connector.
NOTICE:
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 -- CHANGE TO NORMAL IGNITION COIL AND SPARK OF MISFIRING CYLINDER
OK -- REPLACE SPARK PLUG Removal
30. CHANGE TO NORMAL IGNITION COIL AND SPARK OF MISFIRING CYLINDER
(a) Change the installed ignition coil to a ignition coil that functions normally.
(b) Perform a spark test.
CAUTION:
Always disconnect each injector connector.
NOTICE:
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 Removal
OK -- REPLACE IGNITION COIL ASSEMBLY Components
31. CHECK FUEL PUMP OPERATION
(a) Check the fuel pump operation Fuel System.
NG -- REPAIR OR REPLACE FUEL PUMP CONTROL CIRCUIT Fuel Pump Control Circuit
OK -- Continue to next step.
32. CHECK FUEL LINE
(a) Check the fuel line for leakage and blockage.
NG -- REPAIR OR REPLACE FUEL LINE
OK -- CHECK AND REPLACE FUEL SYSTEM (FUEL PUMP, PRESSURE REGULATOR, FUEL FILTER)
33. CHECK MISFIRE COUNT
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG) and turn the Techstream on.
(c) Start the engine.
(d) Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Way / Direct.
(e) Allow the engine to idle.
(f) Monitor all of the misfire count values that are displayed on the Techstream: Powertrain / Engine / Data List / Cylinder #1 Misfire Count to Cylinder #8 Misfire Count.
If no misfire counts occur for any of the cylinders, perform the following procedure:
(1) Move the shift lever to D.
(2) Monitor all of the misfire count values that are displayed on the Techstream.
Result:
B -- REPLACE FUEL INJECTOR ASSEMBLY (FOR DIRECT INJECTION) Components
A -- Continue to next step.
34. INSPECT INJECTOR DRIVER
(a) Turn the engine switch off.
(b) Replace the No. 1 and No. 2 injector drivers with normal ones from another vehicle.
NOTICE:
Do not disconnect and reconnect the connectors with the engine switch on (IG), as the injector driver (EDU) may be damaged.
(c) Connect the Techstream to the DLC3.
(d) Start the engine.
(e) Clear DTCs Reading and Clearing Diagnostic Trouble Codes.
(f) Perform the driving test.
(g) Enter the following menus: Powertrain / Engine / Trouble Codes / Pending.
(h) Read the pending DTCs.
Result
B -- REPLACE INJECTOR DRIVER (NO. 1 OR NO. 2) Components
A -- Continue to next step.
35. INSPECT FUEL RELIEF VALVE ASSEMBLY
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG) and turn the Techstream on.
(c) Start the engine.
(d) Enter the following menus: Powertrain / Engine / Data List / Fuel Press.
(e) Record the Fuel Press value.
(f) Turn the engine switch off.
(g) Wait for 10 seconds.
(h) Turn the engine switch on (IG) and turn the Techstream on.
(i) Enter the following menus: Powertrain / Engine / Data List / Fuel Press.
(j) Compare the Fuel Press value recorded with the engine running to the Fuel Press value currently shown on the Techstream.
Result:
B -- REPLACE FUEL RELIEF VALVE ASSEMBLY Components
A -- REPLACE FUEL PUMP ASSEMBLY (HIGH PRESSURE) Components
36. CHECK HARNESS AND CONNECTOR
(a) Check the connection and terminal contact pressure of connectors and wire harnesses between the mass air flow meter and ECM Electronic Circuit Inspection Procedure.
HINT
Repair any problems.
NEXT -- Continue to next step.
37. CHECK WHETHER DTC OUTPUT RECURS
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Turn the Techstream on.
(d) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.
(e) Turn the engine switch off.
(f) Turn the engine switch on (IG) and turn the Techstream on.
(g) Start the engine and warm it up.
(h) Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
(i) Enter the following menus: Powertrain / Engine / Utility / All Readiness.
(j) Input the DTC: P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307 or P0308.
(k) Check the DTC judgment result.
Result
B -- END
A -- Continue to next step.
38. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - ECM)
(a) Disconnect the MAF meter connector.
(b) Disconnect the ECM connector.
(c) Measure the resistance between the terminals.
Standard resistance (Check for Open):
Standard resistance (Check for Short):
(d) Reconnect the MAF meter connector.
(e) Reconnect the ECM connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
39. REPLACE MASS AIR FLOW METER
(a) Replace the mass air flow meter assembly Removal.
HINT
If the results of the inspections performed in steps 17 and 22 indicated no problem, proceed to the next step without replacing the mass air flow meter assembly.
NEXT -- Continue to next step.
40. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Turn the Techstream on.
(d) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.
(e) Turn the engine switch off.
(f) Turn the engine switch on (IG) and turn the Techstream on.
(g) Start the engine and warm it up.
(h) Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
(i) Enter the following menus: Powertrain / Engine / Utility / All Readiness.
(j) Input the DTC: P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307 or P0308.
(k) Check the DTC judgment result.
Result
B -- REPLACE ECM Removal
A -- END