DN112 - Check EVR Solenoid and Harness For Intermittent Fault

- Key "OFF".

- Disconnect vacuum hose at EGR valve and connect hose to vacuum gauge.

- Disconnect Powertrain Control Module (PCM). Inspect for damaged or pushed out pins, corrosion, loose wires, etc. Service as necessary.

- Install breakout box and connect PCM to breakout box.

- Start engine and run at idle.

- Jumper EGR Vacuum Regulator (EVR) signal test pin 33 to test pin 40.

- While reading the vacuum gauge, tap the EVR solenoid and wiggle the EVR connector and harness.

- Does the vacuum gauge indicate a sudden drop in vacuum when the EVR solenoid is taped or when the connector or harness is wiggled?

NOTE: EVR leakage below 3.4 kPa (1.0 in-Hg) is normal.

Yes -- Isolate fault and service or replace as necessary. Remove breakout box. Reconnect all components. 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.