Code No. P0306: No. 6 Cylinder Misfire Detected
OPERATION
FUNCTION
- If a misfire occurs while the engine is running, the engine
speed changes for an instant.
- The engine-ECU checks for such changes in engine speed.
TROUBLE JUDGMENT
Check Conditions
- Engine speed is 440 -
6,500 r/min.
- Engine coolant temperature is higher than -10°C.
- Barometric pressure is higher than 76 kPa.
- Volumetric efficiency is 30 -
60 %.
- Adaptive learning is complete for the vane which generates a crankshaft position
signal.
- While the engine is running, excluding gear shifting, deceleration, sudden acceleration/deceleration
and A/C compressor switching.
- The throttle deviation is -0.06 V/10 ms to +0.06 V/10 ms.
- Misfire has occurred more frequently than allowed during the last 200 revolutions [when
the catalyst temperature is higher than 1,000°C].
- Misfire has occurred in 15 or more of the last 1,000 revolutions (corresponding
to 1.5 times the limit of emission standard).
PROBABLE CAUSES
- Ignition system related part(s) failed
- Failed No. 6 injector
- Harness damage in No. 6 injector circuit
- Low compression pressure
- Failed engine-ECU
DIAGNOSIS PROCEDURE |
STEP 1. Visual check of ignition spark. |
|
Q.
Is the check result normal?
|
Go to Step 3 . |
|
Go to Step 2 . |
|
STEP 2. Check spark plug. |
Q.
Is the check result normal?
|
Check ignition circuit system (Refer to Inspection Procedure 22 ). |
|
Replace the spark plug. |
|
STEP 3. Connector check: B-133 No. 6 injector connector |
Q.
Is the check result normal?
|
Go to Step 4 . |
|
Repair or replace the connector. |
|
STEP 4. Check No. 6 injector itself. |
Q.
Is the check result normal?
|
Go to Step 5 . |
|
Replace the No. 6 injector. |
|
STEP 5. Connector check: A-24X injector relay connector and B-29 engine-ECU connector |
Q.
Are the check results normal?
|
Go to Step 6 . |
|
Repair or replace the connector. |
|
STEP 6. Check harness between A-24X (terminal No. 3) injector relay connector and B-133 (terminal No. 1) No. 6 injector connector. |
|
|
Q.
Is the check result normal?
|
Go to Step 7 . |
|
Repair the damaged harness wire. |
|
STEP 7. Check harness between B-133 (terminal No. 2) No. 6 injector connector and B-29 (terminal No. 51) engine-ECU connector |
|
Q.
Is the check result normal?
|
Go to Step 8 . |
|
Repair the damaged harness wire. |
|
STEP 8. Check compression pressure. |
Q.
Is the check result normal?
|
Go to Step 9 |
|
Repair. |
|
STEP 9. Check the trouble symptoms. |
Q.
Does trouble symptom persist?
|
Replace the engine-ECU. |
|
Intermittent malfunction (Refer to GROUP 00 -
How to Use Troubleshooting/Inspection
Service Points -
How to Cope with Intermittent Malfunctions ). |
|