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(P0172) FUEL SYSTEM 1/1 LEAN CONTROL BELOW LIMIT (AT LOAD) (CONTINUED) 7. ECT SENSOR OPERATION Note: For this test to be valid, the thermostat must be operating Note: This test works best if performed on a cold engine (cold With the DRB III T , read the Engine Coolant Temperature (ECT) Sen- sor value. If the engine was allowed to sit overnight (cold soak), the Note: If engine coolant temperature is above 82°C (180°F), allow During engine warm-up, monitor the ECT Sensor value. The tempera- Did the Engine Coolant Temperature value increase with a smooth transition and did it reach at least 82°C Yes >> Go To 8 No >> Replace the Engine Coolant Temperature Sensor. (Refer to 7 - COOLING/ENGINE/ENGINE COOLANT TEMP SENSOR - REMOVAL). Perform POWERTRAIN VERIFICATION TEST - VER 2. 8. ENGINE MECHANICAL PROBLEM Check for any of the following conditions/mechanical problems. AIR INDUCTION SYSTEM - must be free from leaks. ENGINE VACUUM - must be at least 440 mbar (13 in. Hg) 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 CRANKCASE VENT SYSTEM - must flow freely TORQUE CONVERTER STALL SPEED - must be within specifications POWER BRAKE BOOSTER - must not have any internal vacuum leaks. FUEL - must be free of contamination FUEL INJECTOR - must not be plugged or restricted; harness connectors must be connected to the correct injec- Are there any engine mechanical problems? Yes >> Repair as necessary. Perform POWERTRAIN VERIFICATION TEST - VER 2. No >> Go To 13 ZH ENGINE - ELECTRICAL DIAGNOSTICS 9 - 245 |