System Readiness Test Codes: Notes

All Honda engines have specific system readiness codes that are part of the on-board diagnostics for the emissions systems. If the vehicle battery has been disconnected or discharged, these codes are erased. In some states where Inspection/Maintenance (I/M) testing of vehicle emissions is performed, these codes must be set. If all the codes are not set, the I/M test cannot be completed.

The Malfunction Indicator Light (MIL) is used to display state of system readiness. To determine if readiness codes are set, turn ignition on, but do not start engine. MIL should come on for 15-20 seconds. If MIL then goes off, readiness test codes are set. If MIL blinks several times, readiness test codes are not set completely. To reset each code, drive vehicle or run engine as described in following procedures.