Part 2

2GR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0300-P0306: 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

(Continued)

11. CHECK HARNESS AND CONNECTOR (FUEL INJECTOR ASSEMBLY - ECM)

(a) Disconnect the fuel injector assembly connector.

(b) Disconnect the ECM connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance (Check for Open):

Standard Resistance (Check for Short):

(d) Reconnect the fuel injector assembly connector.

(e) Reconnect the ECM connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (FUEL INJECTOR ASSEMBLY - ECM)
OK -- Continue to next step.

12. CHECK FUEL INJECTOR ASSEMBLY OF MISFIRING CYLINDER

(a) Check the fuel injector assembly injection (whether fuel volume is high or low, and whether injection pattern is poor) Inspection (to 12/2010).

NG -- REPLACE FUEL INJECTOR ASSEMBLY Removal (to 12/2010)
OK -- Continue to next step.

13. CHECK AIR INDUCTION SYSTEM

(a) Check the air induction system for vacuum leakage.

OK:

No leakage from air induction system.

NG -- REPAIR OR REPLACE AIR INDUCTION SYSTEM
OK -- Continue to next step.

14. CHECK FUEL PRESSURE

(a) Check the fuel pressure On-Vehicle Inspection (to 12/2010).

NG -- CHECK FUEL LINE
OK -- Continue to next step.

15. READ VALUE USING TECHSTREAM (COOLANT TEMP) Engine Control System - SFI System (to 12/2010)

NG -- REPLACE ENGINE COOLANT TEMPERATURE SENSOR
OK -- Continue to next step.

16. READ VALUE USING TECHSTREAM (MAF)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine / Data List / All Data / MAF and Coolant Temp.

(e) Start the engine and warm it up.

(f) Allow the engine to idle until Coolant Temp reaches 75°C (167°F) or higher.

(g) Read MAF with the engine speed at 3000 rpm.

Standard:

Between 12 g/sec. and 17 g/sec. (shift lever: N; A/C: Off).

NG -- CHECK HARNESS AND CONNECTOR
OK -- Continue to next step.

17. CHECK VALVE TIMING Engine Control System - SFI System (to 12/2010)

NG -- ADJUST VALVE TIMING

OK -- CHECK HARNESS AND CONNECTOR

18. CHECK AIR INDUCTION SYSTEM

(a) Check the air induction system for vacuum leakage.

OK:

No leakage from air induction system.

NG -- REPAIR OR REPLACE AIR INDUCTION SYSTEM
OK -- Continue to next step.

19. CHECK FUEL PRESSURE

(a) Check the fuel pressure On-Vehicle Inspection (to 12/2010).

NG -- CHECK FUEL LINE
OK -- Continue to next step.

20. READ VALUE USING TECHSTREAM (COOLANT TEMP) Engine Control System - SFI System (to 12/2010)

NG -- REPLACE ENGINE COOLANT TEMPERATURE SENSOR
OK -- Continue to next step.

21. READ VALUE USING TECHSTREAM (MAF)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine / Data List / All Data / MAF and Coolant Temp.

(e) Start the engine and warm it up.

(f) Allow the engine to idle until Coolant Temp reaches 75°C (167°F) or higher.

(g) Read MAF with the engine speed at 3000 rpm.

Standard:

Between 12 g/sec. and 17 g/sec. (shift lever: N; A/C: Off).

NG -- CHECK HARNESS AND CONNECTOR
OK -- Continue to next step.

22. CHECK VALVE TIMING Engine Control System - SFI System (to 12/2010)

NG -- ADJUST VALVE TIMING
OK -- Continue to next step.

23. CHECK SPARK PLUG

(a) Remove the ignition coil and the spark plug of the misfiring cylinder.

(b) Measure the spark plug electrode gap.

Electrode Gap for New Spark Plug:

1.0 to 1.1 mm (0.0394 to 0.0433 in.)

Maximum Electrode Gap for Used Spark Plug:

1.4 mm (0.0551 in.)

NOTICE:
If the electrode gap is more than the maximum, replace the spark plug. Do not adjust the electrode gap.

(c) Check the electrode for carbon deposits.

Recommended Spark Plug:

(d) Reinstall the ignition coil and spark plug.

NG -- REPLACE SPARK PLUG
OK -- Continue to next step.

24. CHECK FOR SPARKS AND IGNITION

(a) Disconnect the fuel injector assembly connectors to prevent the engine from starting.

CAUTION:
Always disconnect all fuel injector assembly connectors.

NOTICE:
Do not crank the engine for more than 2 seconds.

(b) Remove the ignition coil from the cylinder head.

(c) Install the spark plug onto the ignition coil.

(d) Attach the spark plug assembly to the cylinder head.

(e) Crank the engine for less than 2 seconds and check the spark.

OK:

Sparks jump across electrode gap.

(f) Install the ignition coil.

(g) Reconnect the fuel injector assembly connectors.

NG -- CHANGE TO NORMAL SPARK PLUG AND CHECK SPARK OF MISFIRING CYLINDER
OK -- Continue to next step.

25. CHECK CYLINDER COMPRESSION PRESSURE

(a) Measure the cylinder compression pressure of the misfiring cylinder On-Vehicle Inspection (to 12/2010).

NG -- CHECK ENGINE TO DETERMINE CAUSE OF LOW COMPRESSION
OK -- Continue to next step.

26. CHECK FUEL INJECTOR ASSEMBLY (POWER SOURCE)

(a) Disconnect the fuel injector assembly connector (of the misfiring cylinder).

(b) Turn the ignition switch to ON.

(c) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

(d) Reconnect the fuel injector assembly connector.

NG -- CHECK HARNESS AND CONNECTOR (IG2 RELAY - FUEL INJECTOR ASSEMBLY)
OK -- Continue to next step.

27. CHECK HARNESS AND CONNECTOR (FUEL INJECTOR ASSEMBLY - ECM)

(a) Disconnect the fuel injector assembly connector.

(b) Disconnect the ECM connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance (Check for Open):

Standard Resistance (Check for Short):

B -- END
A -- Continue to next step.

31. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - ECM)

(a) Disconnect the mass air flow meter connector.

(b) Disconnect the ECM connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance (Check for Open):

Standard Resistance (Check for Short):

(d) Reconnect the mass air flow meter connector.

(e) Reconnect the ECM connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

32. REPLACE MASS AIR FLOW METER

(a) Replace the mass air flow meter.

HINT
If the results of the inspections performed in steps 16 and 21 indicated no problem, proceed to the next step without replacing the mass air flow meter.

NEXT -- Continue to next step.

33. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Clear the DTCs DTC Check / Clear (to 12/2010).

(e) Turn the ignition switch off.

(f) Turn the ignition switch to ON 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 or P0306.

(k) Check the DTC judgment result.

Result

B -- REPLACE ECM Removal (to 12/2010)

A -- END

34. 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 all injector connectors.

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 injector connector.

(3) Ground the spark plug.

(4) Check if sparks occur while the engine is being cranked.

OK:

Sparks jump across electrode gap.

NG -- CHANGE TO NORMAL IGNITION COIL AND CHECK SPARK OF MISFIRING CYLINDER

OK -- REPLACE SPARK PLUG

35. CHANGE TO NORMAL IGNITION COIL AND CHECK SPARK OF MISFIRING CYLINDER

(a) Change the ignition coil to a ignition coil that functions normally.

(b) Perform a spark test.

CAUTION:
Always disconnect all injector connectors.

NOTICE:
Do not crank the engine for more than 2 seconds.

(1) Install the spark plug into the ignition coil and connect the ignition coil connector.

(2) Disconnect the injector connector.

(3) Ground the spark plug.

(4) Check if sparks occur while the engine is being cranked.

OK:

Sparks jump across electrode gap.

NG -- REPLACE ECM Removal (to 12/2010)

OK -- REPLACE IGNITION COIL

36. CHECK FUEL LINE

(a) Check the fuel lines for leaks or blockage.

NG -- REPAIR OR REPLACE FUEL LINE

OK -- REPLACE FUEL PUMP Removal (to 12/2010)

37. CHECK HARNESS AND CONNECTOR (IG2 RELAY - FUEL INJECTOR ASSEMBLY)

(a) Disconnect the fuel injector assembly connector.

(b) Remove the IG2 relay from the engine room relay block.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance (Check for Open):

Standard Resistance (Check for Short):

(d) Reinstall the IG2 relay.

(e) Reconnect the fuel injector assembly connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (IG2 RELAY - FUEL INJECTOR ASSEMBLY)

OK -- CHECK ECM POWER SOURCE CIRCUIT Component Tests and General Diagnostics