Function Inspection Using M-MDS

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P0304: 00 (PCM (PYUL)) DIAGNOSTIC PROCEDURE

Step	Inspection	Results	Action
1	PURPOSE: IDENTIFY TRIGGER DTC FOR FREEZE FRAME DATA Is the DTC P0304: 00 on freeze frame data?	Yes	Go to the next step.
1		No	Go to the troubleshooting procedure for DTC on freeze frame data. (See DTC TABLE [PCM (PYUL)] ).
2	PURPOSE: RECORD VEHICLE STATUS WHEN DTC WAS DETECTED TO UTILIZE WITH REPEATABILITY VERIFICATION Record the freeze frame data/snapshot data. NOTE: Recording can be facilitated using the screen capture function of the PC.	-	Go to the next step.
3	PURPOSE: INSPECT FOR OTHER RELATED DTCs Perform the DTC inspection for the PCM. (See DTC INSPECTION .) Are any other DTCs displayed?	Yes	Repair or replace the malfunctioning location according to the applicable DTC troubleshooting. (See DTC TABLE [PCM (PYUL)] ).
3		No	Go to the next step.
4	PURPOSE: VERIFY IF THERE IS PID ITEM CAUSING DRASTIC CHANGES OF ACCELERATION FLUCTUATION BY INPUT SIGNAL TO PCM Start the engine. Access the following PCM PIDs using the M-MDS. (See PID/DATA MONITOR INSPECTION .) APP1 APP2 ECT ECT_VOLT IAT MAF MAP_VOLT ENG_RPM TP1 TP2 VSS Is there a PID item affected by acceleration fluctuation?	Yes	Inspect the suspected sensor and related wiring harness. If there is any malfunction: Repair or replace the malfunctioning part. Go to Troubleshooting Diagnostic Procedure to perform the repair completion verification 1. If there is no malfunction: Go to the next step.
4		No	Go to the next step.
5	PURPOSE: RECORD NUMBER OF CURRENT MISFIRES FOR USE WITH MISFIRE INSPECTION Display the misfire rate and record the number of misfires. Access the following PCM PIDs using the M-MDS. (See PID/DATA MONITOR INSPECTION .) (See PID/DATA MONITOR TABLE [PCM (PYUL)] .) MISFIRE_CYL1_CAT MISFIRE_CYL2_CAT MISFIRE_CYL3_CAT MISFIRE_CYL4_CAT MISFIRE_CYL1_EMI MISFIRE_CYL2_EMI MISFIRE_CYL3_EMI MISFIRE_CYL4_EMI	-	Go to the next step.
6	PURPOSE: VERIFY IF MISFIRE CAUSE IS BAD SPARK PLUGS Switch the spark plug on cylinder No. 4 with the spark plug on the cylinder that is not misfiring. (Refer to [SPARK PLUG REMOVAL/INSTALLATION ] ). Start the engine. Verify all accessory loads (A/C, headlights, blower fan, rear window defogger) are off. Under no-load conditions (P or N position), increase the engine speed to 3, 000 rpm. Display the misfire rate and record the number of misfires. Access the following PCM PIDs using the M-MDS. (See PID/DATA MONITOR INSPECTION .) (See PID/DATA MONITOR TABLE [PCM (PYUL)] .) MISFIRE_CYL1_CAT MISFIRE_CYL2_CAT MISFIRE_CYL3_CAT MISFIRE_CYL4_CAT MISFIRE_CYL1_EMI MISFIRE_CYL2_EMI MISFIRE_CYL3_EMI MISFIRE_CYL4_EMI Is there a change from the recorded number of misfires?	Yes	Go to Troubleshooting Diagnostic Procedure to perform the procedure from Step 1.
6		No	Go to the next step.
7	PURPOSE: VERIFY IF MISFIRE CAUSE IS BAD IGNITION COIL Switch the ignition coil on cylinder No. 4 with the ignition coil on the cylinder that is not misfiring. (Refer to [IGNITION COIL REMOVAL/INSTALLATION ] ). Start the engine. Verify all accessory loads (A/C, headlights, blower fan, rear window defogger) are off. Under no-load conditions (P or N position), increase the engine speed to 3, 000 rpm. Display the misfire rate and record the number of misfires. Access the following PCM PIDs using the M-MDS. (See PID/DATA MONITOR INSPECTION .) (See PID/DATA MONITOR TABLE [PCM (PYUL)] .) MISFIRE_CYL1_CAT MISFIRE_CYL2_CAT MISFIRE_CYL3_CAT MISFIRE_CYL4_CAT MISFIRE_CYL1_EMI MISFIRE_CYL2_EMI MISFIRE_CYL3_EMI MISFIRE_CYL4_EMI Is there a change from the recorded number of misfires?	Yes	Go to Troubleshooting Diagnostic Procedure to perform the procedure from Step 2.
7		No	Go to Troubleshooting Diagnostic Procedure to perform the procedure from Step 3.