DTC P0301, P0302, P0303, P0304, P0305, P0306[AJ (3.0L Duratec)]

id0102a4820100

DTC P0301

DTC P0302

DTC P0303

DTC P0304

DTC P0305

DTC P0306

Cylinder No.1 misfire detection

Cylinder No.4 misfire detection

Cylinder No.2 misfire detection

Cylinder No.5 misfire detection

Cylinder No.3 misfire detection

Cylinder No.6 misfire detection
DETECTION CONDITION
•  The misfire detection monitor is designed to monitor engine misfire and identify the specific cylinder in which the misfire has occurred. If the PCM detects misfire at certain period, the PCM determines that specific cylinder is misfiring.
POSSIBLE CAUSE
•  Ignition system malfunction
•  Damaged fuel injector
•  Running out of fuel
•  Damaged purge solenoid valve
•  Inadequate fuel pressure
•  Evaporative emission system malfunction
•  Base engine malfunction

Warning
•  Read the following warnings before performing the fuel system services:
―  Fuel vapor is hazardous. It can easily ignite, causing serious injuries and damage. Always keep sparks and flames away from fuel.
―  Fuel line spills and leakage are dangerous. Fuel can ignite and cause serious injuries or death and damage. Fuel can also irritate skin and eyes. To prevent this, always complete “BEFORE SERVICE PRECAUTION” and “AFTER SERVICE PRECAUTION” decided in this manual.
Caution
•  Disconnecting/connecting quick release connector without cleaning it may possibly cause damage to fuel pipe and quick release connector. Always clean quick release connector joint area before disconnecting/connecting, and make sure that it is free of foreign materials.

Diagnostic procedure

STEP

INSPECTION

ACTION
1
VERIFY FREEZE FRAME DATA HAS BEEN RECORDED
•  Has FREEZE FRAME DATA been recorded?
Yes
Go to the next step.
No
Record the FREEZE FRAME DATA on the repair order, then go to next step.
2
VERIFY SERVICE INFORMATION AVAILABILITY
•  Verify related Service Information availability.
•  Is any related Service Information available?
Yes
Perform repair or diagnosis according to the available Service Information. If the vehicle is not repaired, go to next step.
No
Go to the next step.
3
CHECK FOR ADAPTIVE FUEL MONITOR AND HO2S CONTINUOUS MEMORY DTCS
Note
•  Following is a list of non-misfire DTCs to look for in the Continuous Memory.
•  Retrieve the continuous memory DTC from PCM.
•  Are any of DTCs P0136, P0156, P0171, P0172, P0174, P0175, P1130 and/or P1150 displayed?
Yes
Go to Step 5.
No
Go to the next step.
4
CHECK FOR OTHER NON-MISFIRE CONTINUOUS MEMORY DTCS
Note
•  Following is a list of non-misfire DTCs to look for in the Continuous Memory.
•  Are other non-misfire DTCs present?
Yes
Go to applicable DTC inspection.
(See DTC TABLE[AJ (3.0L Duratec)].)
No
Go to the next step.
5
CHECK FOR KEY ON ENGINE OFF (KOEO) SELF TEST
•  Perform the KOEO self test.
•  Are any KOEO DTCs displayed?
Yes
Go to applicable DTC inspection.
(See DTC TABLE[AJ (3.0L Duratec)].)
No
Inspect spark plugs and ignition coil. If normal, go to the next step.
6
CHECK FOR OTHER KEY ON ENGINE RUNNING (KOER) SELF EST
Note
•  Check any KOER DTCs, which can cause the Misfire DTC.
•  Perform the KOER self test.
•  Are any additional KOER DTCs displayed?
Yes
If the DTCs P1132, P1138, P1152, P1158, P1131, P1137, P1151 or P1157 are present:
Go to Step 9.All others:
Go to applicable DTC inspection.
(See DTC TABLE[AJ (3.0L Duratec)].)
No
Go to the next step.
7
CHECK/COMPARE PID VALUES
•  Start the engine and warm up to normal operating temperature.
•  Access DPFEGR PID.
•  Record DPFEGR PID value.
•  Turn the ignition switch to off.
•  Turn the ignition switch to the ON position.
•  Access DPFEGR PID.
•  Compare ignition switch to the ON position (engine off) and idle PID values.
•  Was the idle PID value within 0.15 V of ignition switch to the ON position (engine off) value?
Yes
Go to the next step.
No
Go to Step 25.
8
EGR RESTRICTION/FLOW TEST
Note
•  Check any KOER DTCs, which can cause the Misfire DTC.
•  Record and clear DTCs.
•  Disconnect the vacuum line at EGR valve and plug the vacuum line.
•  Complete Misfire Monitor Drive Mode.
•  Is P0300 still present?
Yes
Go to the next step.
No
Inspect for the intake manifold and the EGR valve, then go to Step 26.
9
CHECK INJECTOR DRIVER PIDS INJ1_F THROUGH INJ6_F
•  Turn the ignition switch to the ON position.
•  Access following PIDs for applies DTC:
―  INJ1_F: P0301 is applied
―  INJ2_F: P0302 is applied
―  INJ3_F: P0303 is applied
―  INJ4_F: P0304 is applied
―  INJ5_F: P0305 is applied
―  INJ6_F: P0306 is applied
•  Are the PIDs status Yes?
Yes
Go to the next step.
No
Go to Step 11.
10
CHECK FUEL INJECTORS AND HARNESSES FOR OPEN
•  Disconnect PCM.
•  Measure resistance following for applied at PCM harness side connector.
―  Between terminal 75 and 71, 97 (for fuel injector No.1): P0301 is applied
―  Between terminal 101 and 71, 97 (for fuel injector No.2): P0302 is applied
―  Between terminal 74 and 71, 97 (for fuel injector No.3): P0303 is applied
―  Between terminal 100 and 71, 97 (for fuel injector No.4): P0304 is applied
―  Between terminal 73 and 71, 97 (for fuel injector No.5): P0305 is applied
―  Between terminal 99 and 71, 97 (for fuel injector No.6): P0306 is applied
•  Is the resistance 10 -18 ohms?
Yes
Replace the PCM, then go to Step 26.
No
Go to Step 21.
11
CHECK FUEL PRESSURE
•  Install fuel pressure gauge.
•  Start and run the engine at idle.
•  Record fuel pressure.
•  Increase engine speed to 2,500 rpm and maintain for 1 minute.
•  Note and compare fuel pressure.
•  Is the fuel pressure at the specified pressure?
Yes
Go to the next step.
No
Repair or replace malfunctioning part, then go to Step 26.
12
CHECK ABILITY OF FUEL SYSTEM TO HOLD FUEL PRESSURE
•  Start and run engine at idle. Note the pressure.
•  Increase engine speed to 2,500 rpm and maintain for 1 minute.
•  Look for fuel leakage at the fuel injector O-ring, fuel pressure regulator, and the fuel lines to the fuel charging assembly.
•  Did fuel pressure remain at specification within 34 kPa {0.4 kgf/cm2, 4.9 psi} for 1 minutes.
Yes
Go to the next step.
No
Repair or replace malfunctioning part, then go to Step 26.
13
CHECK FUEL INJECTOR FOR FLOW AND LEAKAGE
•  Measure the flow rate for misfire detected cylinders fuel injector
•  Is flow rate for each fuel injector within specification?
Yes
Fuel delivery system is not likely to have caused the Misfire DTC. Go to the next step.
No
Replace or clean inoperative fuel injector, then go to Step 26.
14
CHECK VACUUM SYSTEM
Note
•  Some vacuum leaks can be heard.
•  Inspect for all vacuum lines for damage, such as pinched lines, cracks, proper routing and assembly.
•  Is the vehicle vacuum system normal?
Yes
Go to the next step.
No
Repair or replace malfunctioning part, then go to Step 26.
15
CHECK DAMPER AND PULLEY ASSEMBLY
Note
•  This pinpoint step is for engines that have damper mounted CKP sensor pulse wheel. Remove the front cover if necessary to observe the crankshaft pulley.
•  Observe the crankshaft pulley for wobble.
•  Examine the CKP sensor pulse wheel fastened to the harmonic fastener.
•  Does the crank pulley wobble or is CKP sensor pulse wheel loose or damaged?
Yes
Replace the pulley or damper assembly, disconnect battery for 5 minutes to allow PCM to learn mew data. Then go to Step 26.
No
Go to the next step.
16
CHECK EVAPORATIVE EMISSION SYSTEM
Note
•  The misfire monitor can be influenced by evaporative emission system. The next five pinpoint test steps will diagnose the evaporative emission system.
•  Check the charcoal canister for fuel saturation.
•  Is there an excess amount of liquid fuel present in the fuel vapor storage charcoal canister?
Yes
Repair or replace malfunctioning part, then go to Step 26.
No
Go to the next step.
17
CHECK VACUUM IN EVAPORATIVE EMISSION SYSTEM
•  Check for blockage/restrictions or cut hose between engine vacuum port and charcoal canister.
•  Check for blockage in fuel tank vent system.
•  Is there a fault indicated?
Yes
Repair or replace malfunctioning part, then go to Step 26.
No
Go to the next step.
18
CHECK OF PURGE SOLENOID VALVE HOUSING LEAKS
•  Purge solenoid valve electrically connected.
•  Install a hand vacuum pump to the vapor port from charcoal canister on the purge solenoid valve vacuum at line.
•  Apply 53 kPa {400 mmHg, 16 inHg} of vacuum with the vacuum pump.
•  Does the purge solenoid valve hold vacuum at room temperature?
Yes
Go to the next step.
No
Replace purge solenoid valve, then go to Step 26.
19
CHECK FOR FILTER CONTAMINATION ON DAMAGE PURGE SOLENOID VALVE
•  Vacuum line from input vacuum port to intake manifold on the purge solenoid valve (control vacuum solenoid part of valve) removed.
•  Install a hand held vacuum pump to the open input vacuum port on the purge solenoid valve.
•  Apply 48—52 kPa {370—390 mmHg, 14.2—15.3 inHg} of vacuum to the purge solenoid valve.
•  Does the purge solenoid valve hold vacuum, or is the valve very slow to release vacuum to atmosphere?
Yes
Replace purge solenoid valve filter. If unable to clean filter or remove blockage to filter, replace purge solenoid valve. Then go to Step 26.
No
Go to the next step.
20
CHECK FOR BASE ENGINE CONCERNS
Note
•  This pinpoint test step will determine if there are any base engine concerns the may have caused the misfire DTC or drive concern.
•  Engine temperature may affect results.
•  Perform the following tests in order to evaluate base engine integrity:
―  Compression and leak down test
―  Valve train analysis
―  PCV system
―  Possible leakage points
•  Is any service required?
Yes
Overhaul the engine. (See ENGINE WORKSHOP MANUAL.) Then go to Step 26.
No
Go to the next step.
21
CHECK FUEL INJECTOR HARNESS RESISTANCE
•  Disconnect the malfunctioning fuel injector in Step 10.
•  Measure the resistance for following at harness side connector:
―  Between fuel injector No.1 terminal B and PCM terminal 71, 97 (INJ1_F, P0201)
―  Between fuel injector No.1 terminal A and PCM terminal 75 (INJ1_F, P0201)
―  Between fuel injector No.2 terminal B and PCM terminal 71, 97 (INJ2_F, P0202)
―  Between fuel injector No.2 terminal A and PCM terminal 101 (INJ2_F, P0202)
―  Between fuel injector No.3 terminal B and PCM terminal 71, 97 (INJ3_F, P0203)
―  Between fuel injector No.3 terminal A and PCM terminal 74 (INJ3_F, P0203)
―  Between fuel injector No.4 terminal B and PCM terminal 71, 97 (INJ4_F, P0204)
―  Between fuel injector No.4 terminal A and PCM terminal 100 (INJ4_F, P0204)
―  Between fuel injector No.5 terminal B and PCM terminal 71, 97 (INJ5_F, P0205)
―  Between fuel injector No.5 terminal A and PCM terminal 73 (INJ5_F, P0205)
―  Between fuel injector No.6 terminal B and PCM terminal 71, 97 (INJ6_F, P0206)
―  Between fuel injector No.6 terminal A and PCM terminal 99 (INJ6_F, P0206)
•  Is each resistance less than 5.0 ohms?
Yes
Go to the next step.
No
Repair for open circuit, then go to Step 26.
22
CHECK FUEL INJECTOR HARNESS CIRCUIT FOR SHORT TO POWER AND GROUND
•  Disconnect PCM.
•  Malfunctioning fuel injector in Step 10 disconnected.
•  Measure resistance for following at PCM harness side connector.
―  Terminal 75 and 71, 97 (INJ1_F, P0201)
―  Terminal 75 and 24, 51, 76, 103 (INJ1_F, P0201)
―  Terminal 101 and 71, 97 (INJ2_F, P0202)
―  Terminal 101 and 24, 51, 76, 103 (INJ2_F, P0202)
―  Terminal 74 and 71, 97 (INJ3_F, P0203)
―  Terminal 74 and 24, 51, 76, 103 (INJ3_F, P0203)
―  Terminal 100 and 71, 97 (INJ4_F, P0204)
―  Terminal 100 and 24, 51, 76, 103 (INJ4_F, P0204)
―  Terminal 73 and 71, 97 (INJ5_F, P0205)
―  Terminal 73 and 24, 51, 76, 103 (INJ5_F, P0205)
―  Terminal 99 and 71, 97 (INJ6_F, P0206)
―  Terminal 99 and 24, 51, 76, 103 (INJ6_F, P0206)
•  Is each resistance greater than 10,000 ohms?
Yes
Go to the next step.
No
Repair for short circuit, then go to Step 26.
23
INSPECT FUEL INJECTOR(S)
•  Inspect fuel injectors.
•  Are fuel injectors normal?
Yes
Go to the next step.
No
Replace suspected fuel injector, then go to Step 26.
24
INSPECT INDUCTION SYSTEM FOR AIR LEAKS
•  Inspect the following areas for signs of air leaks:
―  Inlet tube(s) from air cleaner to throttle body
―  Gaskets which seal the upper and lower intake manifold.
―  Vacuum hoses and lines for cranks and proper connections.
―  PCV system.
•  Are there any signs of leaks or damage?
Yes
Repair or replace malfunctioning part, then go to Step 26.
No
Intermittent malfunction exist, go to the Step 26.
25
CHECK FOR EGR FLOW WITH EGR VACUUM HOSE DISCONNECTED AND PLUGGED
•  Disconnect vacuum hose at EGR valve and plug hose.
•  Connect the M-MDS to DLC-2.
•  Turn then ignition switch to the ON position.
•  Access DPFEGR PID and note PID value.
•  Start the engine and bring idle.
•  With engine at idle, look at the DPFEGR PID value and compare to the engine off reading. An increase in the PID value at idle indicates that the D.P.F. EGR sensor is sensing EGR flow.
•  Is the DPFEGR PID value greater at idle by a minimum of 0.15 V than with the engine off?
Yes
Remove and inspect the EGR valve for signs of contamination, unusual wear, carbon deposits, binding and other damage. Repair or replace the EGR valve, according to inspection result. Then go to the next step.
No
Inspect the EGR control valve and solenoid valve filter for restrictions. Repair or replace malfunctioning part, then go to the next step.
26
VERIFY TROUBLESHOOTING OF DTC P0301, P0302, P0303, P0304, P0305 OR P0306 COMPLETED
•  Make sure to reconnect all disconnected connectors.
•  Clear the DTC from the PCM memory using the M-MDS.
•  Perform KOER self test.
•  Is the PENDING CODE same DTC present?
Yes
Replace PCM, then go to next step.
(See PCM REMOVAL/INSTALLATION[AJ (3.0L Duratec)].)
No
Go to the next step.
27
VERIFY AFTER REPAIR PROCEDURE
•  Perform "AFTER REPAIR PROCEDURE".
•  Is there any DTC present?
Yes
Go to applicable DTC inspection.
(See DTC TABLE[AJ (3.0L Duratec)].)
No
Troubleshooting completed.