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P0175-FUEL SYSTEM 2/1 RICH (CONTINUED) 5. MAP SENSOR OPERATION Turn the ignition off. Connect a Vacuum Gauge to a Manifold Vacuum source. Start the engine. Allow the engine to idle. NOTE: If engine will not idle, maintain a constant RPM above idle. Is the scan tool reading within 1 ( of the Vacuum Gauge reading? Yes >> Go To 6 No >> Replace the MAP Sensor. Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) NOTE: Remove the vacuum gauge before continuing. 6. ECT SENSOR OPERATION NOTE: For this test to be valid, the thermostat must be operating correctly. NOTE: This test works best if performed on a cold engine (cold soak). With the scan tool, read the Engine Coolant Temperature Sensor value. If the engine was allowed to sit overnight NOTE: If engine coolant temperature is above 82°C (180°F), allow the engine to cool until 65°C (150°F) is During engine warm-up, monitor the Engine Coolant Temperature value. The temp value change should be a Did the ECT value increase smoothly and reach at least 180°F (82°C)? Yes >> Go To 7 No >> Replace the Engine Coolant Temperature Sensor. Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) 7. EVAP PURGE SOLENOID OPERATION Turn the ignition off. Disconnect the hoses at the Evap Purge Solenoid. Using a hand vacuum pump, apply 10 inches of vacuum to the Evap Purge Solenoid vacuum source port on the Did the Evap Purge Solenoid hold vacuum? Yes >> Go To 8 No >> Replace the EVAP Purge Solenoid. Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) NOTE: Connect the vacuum hoses before continuing. HB ENGINE ELECTRICAL DIAGNOSTICS 9 - 251 |