With Honda PGM Tester or OBDII Scantool

When the [D4] indicator light has been reported on, connect the OBD II Scan Tool conforming to SAE J1978 or Honda PGM Tester to the DLC (16P) behind the ashtray. Turn the ignition switch ON and observe the DTC on the screen of the OBD II Scan Tool or Honda PGM Tester. After determining the DTC, refer to Diagnosis by Symptom. Symptom Related Diagnostic Procedures

NOTE: See the OBD II Scan Tool or Honda PGM Tester user's manual for specific instructions.