EGR Control Solenoid Valve
- Label and disconnect both vacuum hoses from solenoid valve. See VACUUM DIAGRAMS article. Disconnect electrical connector. Connect hand-held 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 connector. Turn ignition on. Using DVOM, check voltage at connector MFI relay power supply terminal. See EGR CONTROL SOLENOID HARNESS CONNECTOR TERMINAL ID 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 PCM connector. See POWERTRAIN CONTROL MODULE (PCM) LOCATION table under COMPUTERIZED ENGINE CONTROLS. Connect jumper wire between PCM terminal No. 6 and chassis ground. See Figure.
- Using DVOM, check for continuity between connector PCM control circuit terminal and chassis ground. See EGR 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 PCM is suspected, substitute PCM with known-good unit and retest system.EGR CONTROL SOLENOID HARNESS CONNECTOR TERMINAL ID
Application Terminal No. Wire Color MFI Relay Circuit Diamante 1 Red Stealth & 3000GT 2 Red PCM Control Circuit Diamante 2 White Stealth & 3000GT 1 Lt. Green/Red