DL99 - Check EVR Harness Circuit For Intermittents

- Vacuum gauge connected.

- Key on, engine running.

- Look for an increase in EGR vacuum while performing the following:

- With the engine at idle, wiggle the EGR Vacuum Regulator (EVR) solenoid harness between the EVR solenoid and dash panel and between dash panel and Powertrain Control Module (PCM).

- Does the EGR vacuum increase?

Yes -- Isolate and service short in EVR circuit. Remove vacuum gauge. Reconnect all components. Clear continuous memory. Clearing Diagnostic Trouble Codes

Rerun quick test. Quick Test Appendix (Detailed Testing Instructions)

No -- Unable to duplicate and/or identify fault at this time. For further diagnosis using the EEC-IV monitor box or Scan Tool, refer to Normal Scan Data Values.