Code No. P0305: No. 5 Cylinder Misfire Detected

OPERATION

Refer to Code No. P0205: No. 5 Injector System .

FUNCTION

If a misfire occurs while the engine is running, the engine speed changes for an instant.
The engine-A/T-ECU checks for such changes in engine speed.

TROUBLE JUDGMENT

Check Conditions

Engine speed is 440 - 4,500 r/min.
Engine coolant temperature and intake air temperature are more than -10°C.
Barometric pressure is less than 106 kPa.
Volumetric efficiency is between 15 % and 100 %.
The learning compensation control that absorbs the difference in the target location showing the crank position is completed.
During the usual operation, the amount of throttle change is small: between -0.06 V/10 ms and +0.06 V/10 ms.

Judgment Criteria (change in the angular acceleration of the crankshaft is used for misfire detection).

Misfire has occurred more frequently than the limit during the last 200 revolutions (when the catalyst temperature has been 950°C or higher).
or
When the engine often misfires within the first 1,000 revolutions from when the exhaust gas exceeds the E-OBD regulation value.

PROBABLE CAUSES

Ignition system related part(s) failed
Low compression pressure
Failed engine-A/T-ECU

DIAGNOSIS PROCEDURE

STEP 1. Check ignition coil spark.

Q. Is the check result normal?

	Go to Step 2 .

	Check ignition circuit system (Refer to Inspection procedure 25 )

STEP 2. Connector check: B-121 No. 5 injector connector

Q. Is the check result normal?

	Go to Step 3 .

	Repair or replace the connector.

STEP 3. Check No. 5 injector itself.

Check Injector itself (Refer to ).

Q. Is the check result normal?

	Go to Step 4 .

	Replace the No. 5 injector.

STEP 4. Connector check: B-15X engine control relay connector and D-212 engine-A/T-ECU connector

Q. Are the check results normal?

	Go to Step 5 .

	Repair or replace the connector.

STEP 5. Check harness between B-15X (terminal No. 1) engine control relay connector and B-121 (terminal No. 2) No. 5 injector connector.

note

Before checking harness, check intermediate connector B-28, and repair if necessary.

Check power supply line for damage.

Q. Is the check result normal?

	Go to Step 6 .

	Repair the damaged harness wire.

STEP 6. Check harness between B-121 (terminal No. 2) No. 5 injector connector and D-212 (terminal No. 2) engine-A/T-ECU connector

note

Before checking harness, check intermediate connector B-28, and repair if necessary.

Check output line for damage.

Q. Is the check result normal?

	Go to Step 7 .

	Repair the damaged harness wire.

STEP 7. Fuel pressure measurement.

Fuel pressure measurement (Refer to Fuel Pressure Test ).

Q. Is the check result normal?

	Go to Step 8

	Repair.

STEP 8. M.U.T.-III diagnosis code

Reconfirmation of diagnosis code.

Q. Is the diagnosis code set?

	Replace the engine-A/T-ECU.

	Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).