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P0151-O2 SENSOR 2/1 CIRCUIT LOW (CONTINUED) 3. O2 SENSOR Measure the voltage on the (K902) O2 Return Upstream circuit in the Is the voltage at 2.5 volts? Yes >> Replace the 2/1 O2 Sensor. Perform the POWERTRAIN VERIFICATION TEST. (Refer No >> Go To 4 4. (K902) O2 RETURN UPSTREAM CIRCUIT SHORTED TO GROUND Turn the ignition off. Disconnect the C1 PCM harness connector. Measure the resistance between ground and the (K902) O2 Return Is the resistance below 100 ohms? Yes >> Repair the short to ground in the (K902) O2 Return Upstream circuit. Perform the POWERTRAIN VERIFICATION TEST. (Refer No >> Go To 8 HB ENGINE ELECTRICAL DIAGNOSTICS 9 - 195 |