TROUBLESHOOTING FOR DTC
DTC | Diagnostic item |
P0301 P0302 P0303 P0304 | Cylinder 1 Misfire Detected Cylinder 2 Misfire Detected Cylinder 3 Misfire Detected Cylinder 4 Misfire Detected |
DESCRIPTION
Refor to DTC P0300.
FAILURE CONDITIONS
The ECM will set P0301, P0302, P0303 or P0304 and the MIL will turnon if 2 misfires per 100 revolutions are detected during two driving cycles. The misfire rate is measured every 200 revolutions when the following conditions are met:
Speed change is less than 1000 rpm per second. |
Engine speed is between 600 and 4000 RPM. |
Engine load is greater than 2 milliseconds. |
No fuel cut-off. |
Starter is not engaged. |
Vehicle on smooth road (acceleration sensor reports less than 0.3 gacceleration). |
If the misfire rate increases to between 5%-25% per 200 revolutions,there is danger of catalyst damage and the MIL will flash off and on. Thecatalyst temperature could exceed 3542 ?(1950?) if the misfire rateincreases enough. This code indicates a problem with cylinder ignition beingread by the ECM.
CIRCUIT DIAGRAM
TEST PROCEDURE