P1205

Misfire Detected in One Cylinder

NOTE:For random misfiring conditions any of these codes can be set. If this occurs refer to Diagnostic Trouble Code P0300.

P12O1 or P13O1 The scan tool indicates Diagnostic Trouble Code (DTC) P1201 or P1301: Cylinder 1 misfire detected.
P12O2 or P13O2 The scan tool indicates Diagnostic Trouble Code (DTC) P1202 or P1302: Cylinder 2 misfire detected.
P12O3 or P13O3 The scan tool indicates Diagnostic Trouble Code (DTC) P1203 or P1303: Cylinder 3 misfire detected.
P12O4 or P13O4 The scan tool indicates Diagnostic Trouble Code (DTC) P1204 or P1304: Cylinder 4 misfire detected.
P12O5 or P13O5 The scan tool indicates Diagnostic Trouble Code (DTC) P1205 or P1305: Cylinder 5 misfire detected.
P12O6 or P13O6 The scan tool indicates Diagnostic Trouble Code (DTC) P1206 or P1306: Cylinder 6 misfire detected.

Description
Misfire detection is accomplished by monitoring the voltage of the spark plug with the spark plug voltage sensor which is built into the ignition coil.
If misfiring strong enough to damage the catalyst is detected, the MIL will blink during the time of its occurrence, and a misfire DTC will be stored. Then, after the misfire has ceased, the MIL will come on and stay on whenever the ignition switch is ON (II).
If misfiring that increases emissions is detected during two consecutive driving cycles, the MIL will come on, and a misfire DTC will be stored.

NOTE: If some of the DTCs listed below are stored at the same time as a misfire DTC, troubleshoot those DTCs first, then troubleshoot the misfire DTC.

P0106*1, P1128*2, P1129*2: MAP sensor
P0171, P0172, P0174, P0175: Fuel supply system
P0401, P1491, P1498: EGR system
P1316, P1317, P1318, P1319: Spark Plug Voltage Detection System
P0335, P0336, P1336, P1337: CKP sensor
P1381, P1382, P1386, P1387: CYP sensor
*1: '96 model only
*2: '97 model only

Possible Cause
^ Fuel injector clogging, fuel leakage, air leakage
^ Fuel injector circuit open or shorted
^ Injector resistor malfunction
^ Spark plug carbon deposits, fouling, malfunction
^ Ignition coil malfunction
^ ICM malfunction
^ Compression low