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P0175-FUEL SYSTEM 2/1 RICH (CONTINUED) 8. ENGINE MECHANICAL 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. 2/1 O2 SENSOR Ignition on, engine not running. Disconnect the 2/1 O2 Sensor harness connector. With the scan tool, monitor the 2/1 O2 Sensor voltage. O2 Sensor voltage should read 5.0 volts on the scan tool with the con- Connect a jumper wire between the (K43) O2 Sensor 2/1 Signal circuit NOTE: The voltage should drop from 5.0 volts down to 2.5 volts Did the O2 Sensor voltage drop from 5 volts to 2.5 volts when Yes >> Replace the O2 Sensor Perform the POWERTRAIN VERIFICATION TEST. (Refer No >> Go To 10 NOTE: Remove the jumper wire before continuing. 9 - 248 ENGINE ELECTRICAL DIAGNOSTICS WK |