SFI SYSTEM, Diagnostic DTC:P0300,P0301,P0302,P0303,P1336,P1337,P1338 and P1339

DTC Code DTC Name
P0300 Random / Multiple Cylinder Misfire Detected
P0301 Cylinder 1 Misfire Detected
P0302 Cylinder 2 Misfire Detected
P0303 Cylinder 3 Misfire Detected
P1336 Misfiring Rate Sufficient to Damage the Catalyzer
P1337 Misfiring Rate in Cylinder 1 Sufficient to Damage the Catalyzer
P1338 Misfiring Rate in Cylinder 2 Sufficient to Damage the Catalyzer
P1339 Misfiring Rate in Cylinder 3 Sufficient to Damage the Catalyzer

DESCRIPTION

When the engine misfires, high concentrations of hydrocarbons (HC) enter the exhaust gas. Extremely high hydrocarbon concentration levels can cause an increase in exhaust emission levels. Extremely high concentrations of hydrocarbons can also cause increases in the three-way catalytic converter temperature, which may cause damage to the three-way catalytic converter. To prevent this increase in emissions and to limit the possibility of thermal damage, the ECM monitors the misfire count. When the temperature of the three-way catalytic converter reaches the point of thermal degradation, the ECM blinks the MIL.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

P0300

Random / Multiple Cylinder Misfire Detected

Emission deterioration misfire occurs (several cylinders).

  • Open or short in engine wire harness

  • Connector connection

  • Vacuum hose connections

  • Ignition system

  • Fuel injector assembly

  • Fuel pressure

  • Compression pressure

  • Engine mechanical system

  • Emission control system

  • Intake system

  • Exhaust system

  • ECM

Comes on

DTC stored

P0301

Cylinder 1 Misfire Detected

Emission deterioration misfire occurs (No. 1 cylinder).

  • Open or short in engine wire harness

  • Connector connection

  • Vacuum hose connections

  • Ignition system

  • Fuel injector assembly

  • Fuel pressure

  • Compression pressure

  • Engine mechanical system

  • Emission control system

  • Intake system

  • Exhaust system

  • ECM

Comes on

DTC stored

P0302

Cylinder 2 Misfire Detected

Emission deterioration misfire occurs (No. 2 cylinder).

  • Open or short in engine wire harness

  • Connector connection

  • Vacuum hose connections

  • Ignition system

  • Fuel injector assembly

  • Fuel pressure

  • Compression pressure

  • Engine mechanical system

  • Emission control system

  • Intake system

  • Exhaust system

  • ECM

Comes on

DTC stored

P0303

Cylinder 3 Misfire Detected

Emission deterioration misfire occurs (No. 3 cylinder).

  • Open or short in engine wire harness

  • Connector connection

  • Vacuum hose connections

  • Ignition system

  • Fuel injector assembly

  • Fuel pressure

  • Compression pressure

  • Engine mechanical system

  • Emission control system

  • Intake system

  • Exhaust system

  • ECM

Comes on

DTC stored

P1336

Misfiring Rate Sufficient to Damage the Catalyzer

Misfire occurs that may damage three-way catalytic converter (several cylinders).

  • Open or short in engine wire harness

  • Connector connection

  • Vacuum hose connections

  • Ignition system

  • Fuel injector assembly

  • Fuel pressure

  • Compression pressure

  • Engine mechanical system

  • Emission control system

  • Intake system

  • Exhaust system

  • ECM

Blinks

DTC stored

P1337

Misfiring Rate in Cylinder 1 Sufficient to Damage the Catalyzer

Misfire occurs that may damage three-way catalytic converter (No. 1 cylinder).

  • Open or short in engine wire harness

  • Connector connection

  • Vacuum hose connections

  • Ignition system

  • Fuel injector assembly

  • Fuel pressure

  • Compression pressure

  • Engine mechanical system

  • Emission control system

  • Intake system

  • Exhaust system

  • ECM

Blinks

DTC stored

P1338

Misfiring Rate in Cylinder 2 Sufficient to Damage the Catalyzer

Misfire occurs that may damage three-way catalytic converter (No. 2 cylinder).

  • Open or short in engine wire harness

  • Connector connection

  • Vacuum hose connections

  • Ignition system

  • Fuel injector assembly

  • Fuel pressure

  • Compression pressure

  • Engine mechanical system

  • Emission control system

  • Intake system

  • Exhaust system

  • ECM

Blinks

DTC stored

P1339

Misfiring Rate in Cylinder 3 Sufficient to Damage the Catalyzer

Misfire occurs that may damage three-way catalytic converter (No. 3 cylinder).

  • Open or short in engine wire harness

  • Connector connection

  • Vacuum hose connections

  • Ignition system

  • Fuel injector assembly

  • Fuel pressure

  • Compression pressure

  • Engine mechanical system

  • Emission control system

  • Intake system

  • Exhaust system

  • ECM

Blinks

DTC stored

CAUTION / NOTICE / HINT

Tip:

If any DTCs other than misfire DTCs are output, troubleshoot those DTCs first.

PROCEDURE

  1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO MISFIRE DTCS)

    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Engine / Trouble Codes.

    5. Check for DTCs.

      Powertrain > Engine > Trouble Codes

      Result

      Result

      Proceed to

      DTC P0300, P0301, P0302, P0303, P1336, P1337, P1338 and/or P1339 are output

      A

      DTC P0300, P0301, P0302, P0303, P1336, P1337, P1338 and/or P1339 and other DTCs are output

      B
      Tip:

      If any DTCs other than P0300, P0301, P0302, P0303, P1336, P1337, P1338 or P1339 are output, troubleshoot those DTCs first.

    B

    GO TO DTC CHART

    Click here

    A

  2. CHECK IGNITION SYSTEM

    1. Check the ignition system.

      Click here

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE IGNITION SYSTEM

    OK

  3. CHECK CYLINDER COMPRESSION PRESSURE

    1. Measure the cylinder compression pressure of the misfiring cylinder.

      Click here

    Result

    Proceed to

    OK

    NG
    NG

    CHECK ENGINE TO DETERMINE CAUSE OF LOW COMPRESSION

    OK

  4. CHECK INTAKE SYSTEM

    1. Check the intake system for vacuum leaks.

      Click here

      Tip:

      Visually check that the air filter is normal.

      OK

      No leaks from intake system.

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE INTAKE SYSTEM

    OK

  5. CHECK FUEL SYSTEM

    1. Check the fuel system.

      Click here

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE FUEL SYSTEM

    OK

  6. CHECK FUEL INJECTOR ASSEMBLY

    1. Inspect the fuel injector assembly.

      Click here

    Result

    Proceed to

    OK

    NG
    NG

    REPLACE FUEL INJECTOR ASSEMBLY

    Click here

    OK

  7. CHECK ENGINE MECHANICAL SYSTEM

    1. Check for mechanical malfunctions that affect the valve timing, such as a jumped tooth or stretching of the timing belt.

      Tip:

      Remove the cylinder head cover and check the camshafts and other mechanical parts for wear.

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE MALFUNCTIONING PARTS, COMPONENT AND AREA

    OK

  8. CHECK EMISSION CONTROL SYSTEM

    1. Check the emission control system.

      Click here

    Result

    Proceed to

    OK

    NG
    OK

    REPLACE ECM

    Click here

    NG

    REPAIR OR REPLACE EMISSION CONTROL SYSTEM