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. To monitor misfires, the ECM uses both the camshaft position sensor and the crankshaft position sensor. The camshaft position sensor is used to identify any misfiring cylinders and the crankshaft position sensor is used to measure variations in the crankshaft rotation speed. Misfires are counted when the crankshaft rotation speed variations exceed predetermined thresholds. If the misfire count exceeds the threshold levels, and could cause emission control system performance deterioration, the ECM illuminates the MIL and sets a DTC.
DTC No. |
DTC Detection Condition |
Trouble Area |
---|---|---|
P0300 |
Simultaneous misfiring of several cylinders occurs and one of the following conditions is met (2 trip detection logic).
|
|
P0301 P0302 P0303 P0304 |
Misfiring of a specific cylinder occurs and one of the following conditions is met (2 trip detection logic).
|
When DTCs for misfiring cylinders are randomly stored, but DTC P0300 is not stored, it indicates that misfires have been detected in different cylinders at different times. DTC P0300 is only stored when several misfiring cylinders are detected at the same time.
MONITOR DESCRIPTION
The ECM illuminates the MIL and stores a DTC immediately when either one of the following conditions, which could cause emission deterioration, is detected (2 trip detection logic).
The ECM flashes the MIL (immediately detection logic) and stores a DTC (2 trip detection logic) when either one of the following conditions, which could cause damage to the three-way catalytic converter, is detected.
HINT:
If a catalyst-damaging misfire occurs, the monitor informs the driver by blinking the MIL.
The ECM illuminates the MIL and stores a DTC when either one of the following conditions, which could cause emission deterioration, is detected (2 trip detection logic).
MONITOR STRATEGY
Related DTCs |
P0300: Multiple Cylinder Misfire P0301: Cylinder 1 Misfire P0302: Cylinder 2 Misfire P0303: Cylinder 3 Misfire P0304: Cylinder 4 Misfire |
Required Sensors/Components (Main) |
Crankshaft position sensor Camshaft position sensor |
Required Sensors/Components (Related) |
Engine coolant temperature Intake air temperature sensor Mass air flow meter |
Frequency of Operation |
Continuous |
Duration |
1000 crankshaft revolutions (soon after engine is started: 1 time, other 4 times) (Emission-related misfire) 200 crankshaft revolutions (1 or 3 times) (Catalyst-damaging misfire) |
MIL Operation |
2 driving cycles: Emission-related misfire MIL flashes immediately: Catalyst-damaging misfire |
Sequence of Operation |
None |
TYPICAL ENABLING CONDITIONS
Misfire
Monitor runs whenever following DTCs not stored |
P0016 (VVT System - Misalignment) P0017 (Exhaust VVT System - Misalignment) P0102, P0103 (Mass Air Flow Meter) P0112, P0113 (Intake Air Temperature Sensor) P0115, P0117, P0118 (Engine Coolant Temperature Sensor) P0125 (Insufficient Coolant Temperature for Closed Loop Fuel Control) P0120, P0121, P0122, P0123, P0220, P0222, P0223, P2135 (Throttle Position Sensor) P0327, P0328 (Knock Sensor) P0335 (Crankshaft Position Sensor) P0340 (Camshaft Position Sensor) P0351 - P0354 (Igniter) P0500 (Vehicle Speed Sensor) P0705 (Shift Lever Position Switch) |
Battery voltage |
8 V or higher |
VVT system |
Not operated by scan tool |
Engine speed |
400 to 6100 rpm |
Either of following conditions (a) or (b) met |
- |
(a) Engine coolant temperature at engine start |
Higher than -7°C (19°F) |
(b) Engine coolant temperature |
Higher than 20°C (68°F) |
Fuel cut |
OFF |
First 1000 revolutions after engine start, or during check mode |
Crankshaft 1000 revolutions |
Except above |
Crankshaft 1000 revolutions x 4 |
All of following conditions 1, 2, 3 and 4 met |
Crankshaft 200 revolutions x 3 |
Except above (MIL blinks immediately) |
Crankshaft 200 revolutions |
1. Driving cycles |
1st |
2. Check mode |
OFF |
3. Engine speed |
Less than 2300 rpm |
4. Intake air amount per revolution |
Less than 1.05 g/rev |
TYPICAL MALFUNCTION THRESHOLDS
Monitor Period of Emission-related Misfire
Misfire rate |
2.041% or more |
Number of misfires per 200 revolutions |
124 or more (varies with intake air amount and engine speed) |
MONITOR RESULT
Refer to Checking Monitor Status (See page
).
CONFIRMATION DRIVING PATTERN
HINT:
In order to store misfire DTCs, it is necessary to operate the vehicle for the period of time shown in the table below, confirm the Misfire RPM and Misfire Load in the Data List.
Engine speed |
Duration |
---|---|
Idling |
8.0 minutes or more |
1000 |
4.5 minutes or more |
2000 |
2.5 minutes or more |
3000 |
1.5 minutes or more |
HINT:
Do not turn the ignition switch off until the output DTC(s) and freeze frame data have been recorded. When the ECM returns to normal mode (default), the stored DTC(s), freeze frame data and other data are cleared.
WIRING DIAGRAM
Refer to DTC P0102 (See page ).
Refer to Fuel Injector Circuit (See page ).
CAUTION / NOTICE / HINT
HINT:
If the elapsed time is over 0 seconds, then the engine speed is high (engine speed at which fuel cut occurs + 500 rpm).
When this has happened, there is the possibility that the No. 1 valve rocker arm sub-assembly will become loose and a fire could start, so check that the valve rocker arm is properly attached (See page ).
PROCEDURE
1. |
CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO MISFIRE DTCS) |
(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 / Trouble Codes.
(e) Read the DTCs.
HINT:
Write down the output DTCs.
Result |
Proceed to |
---|---|
DTC P0300, P0301, P0302, P0303 and/or P0304 are output |
A |
DTC P0300, P0301, P0302, P0303 and/or P0304 and other DTCs are output |
B |
HINT:
If any DTCs other than P0300, P0301, P0302, P0303 and P0304 are output, troubleshoot those DTCs first.
B |
GO TO DTC CHART |
|
2. |
CHECK PCV HOSE CONNECTIONS |
(a) Check the PCV hose connections (See page ).
OK:
PCV hose is correctly connected and is not damaged.
NG |
REPAIR OR REPLACE PCV HOSE |
|
3. |
READ VALUE USING TECHSTREAM (MISFIRE RPM AND MISFIRE LOAD) |
(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 / Misfire RPM and Misfire Load.
(e) 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.
|
4. |
READ VALUE USING TECHSTREAM (CATALYST OT MF F/C) |
(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 / Catalyst OT MF F/C.
(e) Read the value displayed on the Techstream.
Data List |
Techstream Display |
Proceed to |
---|---|---|
Catalyst OT MF F/C |
Avail |
A |
Not Avl |
B |
B |
GO TO STEP 6 |
|
5. |
PERFORM ACTIVE TEST USING TECHSTREAM |
(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 / Active Test / Prohibit the Catalyst OT Misfire prevent F/C.
(e) Perform the Active Test.
NOTICE:
When performing the Active Test, make sure the vehicle is stopped and the engine is either idling or being revved within 3000 rpm.
|
6. |
READ VALUE USING TECHSTREAM (CYLINDER #1 (to #4) MISFIRE COUNT) |
(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 / Gas Misfire / Cylinder #1 Misfire Count, Cylinder #2 Misfire Count, Cylinder #3 Misfire Count and Cylinder #4 Misfire Count.
(e) Start the engine and allow the engine to idle.
(f) Read each value for Cylinder #1 Misfire Count to Cylinder #4 Misfire Count displayed on the Techstream. If no misfire counts occur in any cylinders, perform procedure [A] and [B] and then check the misfire counts again.
(g) Drive the vehicle with the Misfire RPM and Misfire Load noted in the "Read Value Using Techstream (Misfire RPM and Misfire Load)" procedures above [A].
(h) Read the Cylinder #1 Misfire Count to Cylinder #4 Misfire Count or DTCs displayed on the Techstream [B].
Result
Result |
Proceed to |
---|---|
Most misfires occur in only 1 or 2 cylinders |
A |
3 cylinders or more have equal misfire counts |
B |
HINT:
B |
GO TO STEP 18 |
|
7. |
INSPECT SPARK PLUG |
(a) Inspect the spark plug of the misfiring cylinder (See page ).
HINT:
Perform "Inspection After Repair" after replacing the spark plug (See page ).
NG |
REPLACE SPARK PLUG |
|
8. |
CHECK FOR SPARK (SPARK TEST) |
(a) Perform a spark test (See page ).
HINT:
|
9. |
CHECK CYLINDER COMPRESSION PRESSURE |
(a) Measure the cylinder compression pressure of the misfiring cylinder (See page ).
HINT:
Perform "Inspection After Repair" after repairing or replacing the engine assembly (See page ).
NG |
CHECK ENGINE TO DETERMINE CAUSE OF LOW COMPRESSION |
|
10. |
CHECK HARNESS AND CONNECTOR (POWER SOURCE OF FUEL INJECTOR ASSEMBLY) |
(a) Disconnect the ECM connector.
(b) Turn the ignition switch to ON.
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection |
Switch Condition |
Specified Condition |
---|---|---|
B58-85 (#10) - B58-109 (E01) |
Ignition switch ON |
11 to 14 V |
B58-84 (#20) - B58-109 (E01) |
Ignition switch ON |
11 to 14 V |
B58-83 (#30) - B58-109 (E01) |
Ignition switch ON |
11 to 14 V |
B58-82 (#40) - B58-109 (E01) |
Ignition switch ON |
11 to 14 V |
NG |
GO TO FUEL INJECTOR CIRCUIT |
|
11. |
CHECK FUEL INJECTOR OF MISFIRING CYLINDER |
(a) Check the injector injection (whether fuel volume is high or low, and whether injection pattern is poor) (See page ).
HINT:
Perform "Inspection After Repair" after replacing the fuel injector assembly (See page ).
NG |
REPLACE FUEL INJECTOR |
|
12. |
CHECK INTAKE SYSTEM |
(a) Check the intake system for vacuum leaks (See page ).
OK:
No leaks from intake system.
HINT:
Perform "Inspection After Repair" after repairing or replacing the intake system (See page ).
NG |
REPAIR OR REPLACE INTAKE SYSTEM |
|
13. |
CHECK INTAKE AIR CONTROL VALVE ACTUATOR (FOR TUMBLE CONTROL VALVE) |
(a) Check the intake air control valve actuator for tumble control valve (See page ).
NG |
REPLACE INTAKE AIR CONTROL VALVE ACTUATOR (FOR TUMBLE CONTROL VALVE) |
|
14. |
CHECK FUEL PRESSURE |
(a) Check the fuel pressure (See page ).
NG |
GO TO STEP 34 |
|
15. |
READ VALUE USING TECHSTREAM (COOLANT TEMP) |
NG |
REPLACE ENGINE COOLANT TEMPERATURE SENSOR |
|
16. |
READ VALUE USING TECHSTREAM (MAF) |
NG |
GO TO STEP 29 |
|
17. |
CHECK VALVE TIMING |
OK |
GO TO STEP 29 |
NG |
GO TO STEP 35 |
18. |
CHECK INTAKE SYSTEM |
(a) Check the intake system for vacuum leaks (See page ).
OK:
No leaks from intake system.
HINT:
Perform "Inspection After Repair" after repairing or replacing the intake system (See page ).
NG |
REPAIR OR REPLACE INTAKE SYSTEM |
|
19. |
CHECK INTAKE AIR CONTROL VALVE ACTUATOR (FOR TUMBLE CONTROL VALVE) |
(a) Check the intake air control valve actuator for tumble control valve (See page ).
NG |
REPLACE INTAKE AIR CONTROL VALVE ACTUATOR (FOR TUMBLE CONTROL VALVE) |
|
20. |
CHECK FUEL PRESSURE |
(a) Check the fuel pressure (See page ).
NG |
GO TO STEP 34 |
|
21. |
READ VALUE USING TECHSTREAM (COOLANT TEMP) |
NG |
REPLACE ENGINE COOLANT TEMPERATURE SENSOR |
|
22. |
READ VALUE USING TECHSTREAM (MAF) |
NG |
GO TO STEP 29 |
|
23. |
CHECK VALVE TIMING |
NG |
GO TO STEP 35 |
|
24. |
INSPECT SPARK PLUG |
(a) Inspect the spark plug of the misfiring cylinder (See page ).
HINT:
Perform "Inspection After Repair" after replacing the spark plug (See page ).
NG |
REPLACE SPARK PLUG |
|
25. |
CHECK FOR SPARK (SPARK TEST) |
(a) Perform a spark test (See page ).
HINT:
|
26. |
CHECK CYLINDER COMPRESSION PRESSURE |
(a) Measure the cylinder compression pressure of the misfiring cylinder (See page ).
HINT:
Perform "Inspection After Repair" after repairing or replacing the engine assembly (See page ).
NG |
CHECK ENGINE TO DETERMINE CAUSE OF LOW COMPRESSION |
|
27. |
CHECK HARNESS AND CONNECTOR (POWER SOURCE OF FUEL INJECTOR ASSEMBLY) |
(a) Disconnect the ECM connector.
(b) Turn the ignition switch to ON.
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection |
Switch Condition |
Specified Condition |
---|---|---|
B58-85 (#10) - B58-109 (E01) |
Ignition switch ON |
11 to 14 V |
B58-84 (#20) - B58-109 (E01) |
Ignition switch ON |
11 to 14 V |
B58-83 (#30) - B58-109 (E01) |
Ignition switch ON |
11 to 14 V |
B58-82 (#40) - B58-109 (E01) |
Ignition switch ON |
11 to 14 V |
NG |
GO TO FUEL INJECTOR CIRCUIT |
|
28. |
CHECK FUEL INJECTOR OF MISFIRING CYLINDER |
(a) Check the injector injection (whether fuel volume is high or low, and whether injection pattern is poor) (See page ).
HINT:
Perform "Inspection After Repair" after replacing the fuel injector assembly (See page ).
NG |
REPLACE FUEL INJECTOR |
|
29. |
CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER CONNECTOR CONNECTION) |
(a) Check the connection and terminal contact pressure of connectors and wire harnesses between the mass air flow meter and ECM (See page ).
HINT:
Repair any problems.
|
30. |
CHECK WHETHER DTC OUTPUT RECURS |
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Clear the DTCs (See page ).
(e) Turn the ignition switch off and wait for at least 30 seconds.
(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 or P0304.
(k) Check the DTC judgment result.
Result
Result |
Proceed to |
---|---|
ABNORMAL (DTC P0300, P0301, P0302, P0303 or P0304 is output) |
A |
NORMAL (DTC is not output) |
B |
B |
END |
|
31. |
CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - ECM) |
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
32. |
REPLACE MASS AIR FLOW METER |
(a) Replace the mass air flow meter (See page ).
HINT:
|
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 (See page ).
(e) Turn the ignition switch off and wait for at least 30 seconds.
(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 or P0304.
(k) Check the DTC judgment result.
Result
Result |
Proceed to |
---|---|
NORMAL (DTC is not output) |
A |
ABNORMAL (DTC P0300, P0301, P0302, P0303 or P0304 is output) |
B |
A |
END |
B |
REPLACE ECM |
34. |
CHECK FUEL LINE |
(a) Check the fuel lines for leaks or blockage.
HINT:
Perform "Inspection After Repair" after replacing the fuel pump (See page ).
OK |
REPLACE FUEL PUMP |
NG |
REPAIR OR REPLACE FUEL LINE |
35. |
CHECK ENGINE MECHANICAL SYSTEM |
NG |
REPAIR OR REPLACE MALFUNCTIONING PARTS, COMPONENT AND AREA |
|
36. |
CHECK WHETHER DTC OUTPUT RECURS |
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Clear the DTCs (See page ).
(e) Turn the ignition switch off and wait for at least 30 seconds.
(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 or P0304.
(k) Check the DTC judgment result.
Result
Result |
Proceed to |
---|---|
DTC is not output |
A |
DTC P0300, P0301, P0302, P0303 or P0304 is output |
B |
A |
CHECK FOR INTERMITTENT PROBLEMS |
B |
REPLACE ECM |
Rear Speed Sensor RH Circuit (C0210/33,C0215/34,C1273/73,C1274/74,C1332/38,C1333/39)
DESCRIPTION
The speed sensor detects the wheel speed and sends the appropriate signals to
the skid control ECU. These signals are used for the ABS control system.
Speed sensor rotors have rows of alternating N and S magnetic poles (for 2WD)
or 48 serrati ...
System Diagram
SYSTEM DIAGRAM
Communication Table
Transmitting ECU (Transmitter)
Receiving ECU (Receiver)
Signal
Communication Method
Certification ECU (smart key ECU assembly)
Power management contro ...
Pressure Control Solenoid "A" Performance (Shift Solenoid Valve SL1) (P0746)
SYSTEM DESCRIPTION
The TCM uses the vehicle speed signal and signals from the transmission speed
sensors (NC, NT) to detect the actual gear (1st, 2nd, 3rd, 4th, 5th or 6th gear).
Then the TCM compares the actual gear with the shift schedule in the TCM memo ...