KC4 - Attempt to Eliminate DTC 313

- Disconnect vacuum line on Secondary Air Injection Bypass (AIRB) valve and cap vacuum line.

- Key "OFF".

- Repeat Engine Running Self-Test and record Diagnostic Trouble Codes (DTC). Key ON Engine Running (KOER) Self-Test

- Is DTC 313 present?

Yes -- EEC-IV system OK. Reconnect vacuum line. Refer to Emission Control Systems/Testing and Inspection.

No -- Go to KC5. KC5 - Enter Output State Diagnostic Test Mode