|
|
3. (K902) O2 UPSTREAM RETURN CIRCUIT SHORTED TO BATTERY VOLTAGE Turn the ignition off. Disconnect the C1 PCM harness connector. WARNING: Do not probe the PCM harness connectors. Probing the Measure the voltage on the (K902) O2 Upstream Return circuit in the Is there any voltage present? Yes >> Repair the short to battery voltage in the (K902) O2 Upstream Return circuit. Perform the POWERTRAIN VERIFICATION TEST. (Refer to No >> Go To 4 4. O2 SENSOR Turn the ignition off. Connect the C1 PCM harness connector. Connect a jumper wire between the (K43) O2 2/1 Signal circuit and the Ignition on, engine not running. With a scan tool, monitor the 2/1 O2 Sensor voltage. Is the voltage between 2.3 and 2.7 volts with the jumper wire in Yes >> Replace the O2 Sensor. Perform the POWERTRAIN VERIFICATION TEST. (Refer to No >> Go To 5 NOTE: Remove the jumper wire before continuing. 9 - 158 ENGINE ELECTRICAL DIAGNOSTICS KJ |