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P2097-DOWNSTREAM FUEL TRIM SYSTEM 1 RICH (CONTINUED) 4. O2 SENSOR Ignition on, engine not running. Disconnect the 1/2 O2 Sensor harness connector. With the scan tool, monitor the 1/2 O2 Sensor voltage. The O2 Sensor voltage should read 5.0 volts on the scan tool with the Using a jumper wire, jump the (K141) O2 Sensor 1/2 Signal circuit to 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 POWERTRAIN VERIFICATION TEST. (Refer to 9 No >> Go To 5 9 - 646 ENGINE ELECTRICAL DIAGNOSTICS ND |