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P0157-O2 SENSOR 2/2 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 the POWERTRAIN VERIFICATION TEST. (Refer 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 the POWERTRAIN VERIFICATION TEST. (Refer No >> Go To 8 9 - 208 ENGINE ELECTRICAL DIAGNOSTICS WK |