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9. 1/1 O2 SENSOR NOTE: Perform the following test on the O2 Sensors whose volt- Disconnect the 1/1 O2 Sensor harness connector. With a scan tool, monitor the 1/1 O2 Sensor voltage. O2 Sensor voltage should read 5.0 volts on the scan tool with the con- Connect a jumper wire between the (K41) O2 Sensor 1/1 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 1/1 O2 Sensor Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) No >> Go To 10 NOTE: Remove the jumper wire before continuing. 10. (K41) O2 SENSOR 1/1 SIGNAL CIRCUIT WARNING: When the engine is operating, do not stand in direct Measure the voltage on the (K41) O2 Sensor 1/1 Signal circuit in the Is the voltage above 4.8 volts? Yes >> Check the (K41) O2 Sensor 1/1 Signal circuit for damage, short to ground, open, or short to voltage. Inspect the O2 Perform the POWERTRAIN VERIFICATION TEST. (Refer No >> Go To 11 9 - 196 ENGINE ELECTRICAL DIAGNOSTICS LX |