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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. 8. ENGINE MECHANICAL PROBLEM Check for any of the following conditions/mechanical problems. AIR INDUCTION SYSTEM - must be free from restrictions. ENGINE VACUUM - must be at least 13 inches in neutral. ENGINE VALVE TIMING - must be within specifications. ENGINE COMPRESSION - must be within specifications. ENGINE EXHAUST SYSTEM - must be free of any restrictions or leaks. ENGINE PCV SYSTEM - must flow freely. TORQUE CONVERTER STALL SPEED - must be within specifications. POWER BRAKE BOOSTER - no internal vacuum leaks. FUEL - must be free of contamination. FUEL INJECTOR - plugged or restricted injector; control wire not connected to correct injector. Are there any engine mechanical problems? Yes >> Repair as necessary. Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) No >> Go To 12 9 - 208 ENGINE ELECTRICAL DIAGNOSTICS LX |