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P0137-O2 SENSOR 1/2 CIRCUIT LOW (CONTINUED) 3. O2 SENSOR Measure the voltage on the (K904) O2 Return Downstream circuit in Is the voltage at 2.5 volts? Yes >> Replace the O2 Sensor. Perform POWERTRAIN VERIFICATION TEST. (Refer to 9 No >> Go To 4 4. (K904) O2 RETURN DOWNSTREAM CIRCUIT SHORTED TO GROUND Turn the ignition off. Disconnect the C2 PCM harness connector. Measure the resistance between ground and the (K904) O2 Return Is the resistance below 100 ohms? Yes >> Repair the short to ground in the (K904) O2 Return Down- stream circuit. Perform POWERTRAIN VERIFICATION TEST. (Refer to 9 No >> Go To 8 9 - 154 ENGINE ELECTRICAL DIAGNOSTICS ND |