Join Date: Jul 2002
Location: Buffalo, NY USA
From the service documentation:
When troubleshooting misfire DTCs (P0301 thru P0306) with the PGM Tester, look at the freeze data values for the throttle position (TP) sensor and the exhaust gas recirculation valve lift sensor (EGR VLS).
If the EGR VLS value is more than 1.25 volts and the TP sensor value is 0.5 volt (closed throttle), the EGR valve opened when it should have been closed, and it is defective. Replace the EGR valve.
If the TP sensor value is more than 0.5 volt and the vehicle speed sensor (VSS) and RPM values indicate that the DTC was set while the vehicle was moving, write down or print out the EGR VLS value. Then, drive the vehicle at the same VSS and RPM values as shown in the freeze data, and note
the EGR VLS value:
• If the freeze data EGR VLS value is more than 1.25 volts but the EGR VLS value from the test drive is less than 1.25 volts, the EGR valve was stuck open, and it is defective. Replace the EGR valve.
• If the EGR VLS value from the test drive is similar to the EGR VLS value on the freeze data, the EGR valve is OK and isn’t the cause of your misfire DTCs. Look for other possible causes.
Tim Poliniak - ASE Certified Parts Specialist, 22 years with Acura/Honda