EGR Control Solenoid Valve
- Label and disconnect both vacuum hoses from solenoid valve. See VACUUM DIAGRAMS article. Disconnect electrical connector. Connect hand vacuum pump to solenoid valve nipple where Green-striped hose was connected. Apply vacuum to solenoid valve. Vacuum should hold.
- Apply battery voltage to terminals of solenoid valve. Vacuum should bleed down when voltage is applied to terminals. Using an ohmmeter, check resistance across solenoid valve terminals. Reading should be 36-44 ohms at 68°F (20°C). If reading is not within specification, replace valve.
- Disconnect EGR solenoid harness connector. Turn ignition on. Using DVOM, measure voltage at harness connector MFI relay power supply terminal. See EGR CONTROL SOLENOID HARNESS CONNECTOR TERMINAL table.
- If battery voltage is present, go to step 5). If battery voltage is not present, check and repair circuit between purge solenoid and MFI relay. If circuit is okay, inspect MFI relay. See RELAYS under MOTORS, RELAYS & SOLENOIDS.
- Disconnect ECM harness connector. See ENGINE CONTROL MODULE (ECM) LOCATION table under COMPUTERIZED ENGINE CONTROLS. Connect jumper wire between ECM terminal No. 53 and vehicle ground. See Figure .
- Using DVOM, check for continuity between harness connector ECM control circuit terminal and vehicle ground. See PURGE CONTROL SOLENOID HARNESS CONNECTOR TERMINAL ID
table. If continuity does not exist, check and repair circuit as needed. If continuity exists and preceding tests do not show any system or component malfunction and ECM is suspected, substitute ECM with known good unit and retest system.EGR CONTROL SOLENOID HARNESS CONNECTOR TERMINAL ID
Application Terminal No. Wire Color MFI Relay Circuit 1.8L 1 Yellow/White 2.0L 1 Red ECM Control Circuit 1.8L 2 Brown/White 2.0L Non-Turbo 2 Brown/White 2.0L Turbo 1 Black/Yellow