Auto Repairing 1998–2002 Honda Accords Troubleshooting Multiple Misfire DTCs

Auto Repairing 1998–2002 Honda Accords Troubleshooting Multiple Misfire DTCs

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NOTE: This article applies to ’98–02 Accord L4s, ’95–02 Accord V6s, ’98–01 Preludes, and ’99–02 Odysseys. Whentroubleshooting 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 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 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 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 DTC problem. Look for other possible causes.