|
|
3. 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 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 4 4. O2 SENSOR Ignition on, engine not running. Disconnect the 2/2 O2 Sensor harness connector. With the scan tool, monitor the 2/2 O2 Sensor voltage. The O2 Sensor voltage should read 5.0 volts on the scan tool with the Using a jumper wire, jump the (K243) O2 Sensor 2/2 Signal circuit to NOTE: The voltage should drop from 5.0 volts to 2.5 volts with the Did the O2 Sensor volts change from 5.0 volts to 2.5 volts? Yes >> Replace the O2 Sensor Perform the POWERTRAIN VERIFICATION TEST. (Refer to No >> Go To 5 9 - 542 ENGINE ELECTRICAL DIAGNOSTICS KJ |