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EGR Cut-Off Solenoid

  1. Disconnect vacuum hose at EGR valve. Connect vacuum gauge to hose. Warm engine to operating temperature (cooling fan comes on). Increase engine speed to about 3000 RPM. If vacuum is shown on gauge, solenoid is operating properly.
  2. If vacuum is not shown on gauge, disconnect EGR cut-off solenoid connector. Turn ignition on. Connect negative voltmeter lead to ground. Check for voltage at EGR solenoid connector. If voltage is not present, check for blown fuse, or open or short in solenoid power supply wire. See Figure - Figure . Also see appropriate wiring diagram in the COMPUTERIZED ENGINE CONTROLS section.
  3. If voltage is present, increase engine speed to about 3000 RPM. Check voltage across solenoid terminals. If voltage is shown and vacuum is not present on gauge, check for restricted hose or replace defective solenoid.
  4. If voltage is not present, check for open ground wire to solenoid. See Figure - Figure . Also see appropriate wiring diagram in the COMPUTERIZED ENGINE CONTROLS section. If ground wire is okay, substitute a known good ECU and retest. If symptom is rectified, replace original ECU.
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