Note. For terminal identification, see TERMINAL IDENTIFICATION in SELF-DIAGNOSTICS section. For circuit and wire color identification, see WIRING DIAGRAMS article.
- Turn engine off. Label and disconnect vacuum hose (Black/Red hose) from purge solenoid. Disconnect electrical connector. Connect hand vacuum pump to solenoid valve nipple where hose was connected. Apply vacuum to solenoid valve. Vacuum should hold.
- Apply battery voltage across terminals of solenoid. Vacuum should bleed down when voltage is applied to terminals. Using an ohmmeter, check resistance across solenoid terminals. If resistance at 68°F (20°C) is 36 to 44 ohms on Galant (California), or 62-74 ohms on Galant (Federal), go to next step. If solenoid does not test as specified, replace solenoid.
- Disconnect purge solenoid vacuum hose (Red hose) from throttle body on turbo engine and Galant (Federal), or from intake manifold or plenum on all other engines. Connect hand vacuum pump to nipple. Apply 16 in. Hg of vacuum. Start engine and gradually increase RPM. Vacuum reading should remain constant as RPM increases. If vacuum is as specified, go to next step. If no vacuum exists, check throttle body purge port for obstruction.
- Using scan tool in MUT II mode, read SERVICE DATA No. 29 (neutral position switch). Place gear selector in each position. If scan tool display matches gear selected, check vapor hose between fuel tank and EVAP canister. If scan tool display does not match gear selected, check ignition switch and park/neutral position switch circuit.