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P2099-DOWNSTREAM FUEL TRIM SYSTEM 2 RICH (CONTINUED) 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 Signal 2/2 circuit to the NOTE: The voltage should drop from 5.0 volts to 2.5 volts with 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 No >> Go To 5 9 - 880 ENGINE ELECTRICAL DIAGNOSTICS WK |