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3. (K904) O2 DOWNSTREAM RETURN CIRCUIT SHORTED TO BATTERY VOLTAGE Turn the ignition off. Disconnect the C2 PCM harness connector. Ignition on, engine not running. Measure the voltage on the (K904) O2 Downstream Return circuit in the Is there any voltage present? Yes >> Repair the short to battery voltage in the (K904) O2 Down- stream Return circuit. Perform the POWERTRAIN VERIFICATION TEST. (Refer to No >> Go To 4 4. O2 SENSOR Turn the ignition off. Connect the C2 PCM harness connector. Connect a jumper wire between the (K243) O2 2/2 Signal circuit and Ignition on, engine not running. With a scan tool, monitor the 2/2 O2 Sensor voltage. Is the voltage between 2.3 and 2.7 volts with the jumper wire Yes >> Replace the O2 Sensor. Perform the POWERTRAIN VERIFICATION TEST. (Refer to No >> Go To 5 NOTE: Remove the jumper wire before continuing. 9 - 174 ENGINE ELECTRICAL DIAGNOSTICS KJ |