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• When Monitored: • Set Condition: Possible Causes (K141) O2 1/2 SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE (K904) O2 DOWNSTREAM RETURN CIRCUIT SHORTED TO BATTERY VOLTAGE (K141) O2 1/2 SENSOR SIGNAL CIRCUIT OPEN (K904) O2 DOWNSTREAM RETURN CIRCUIT OPEN O2 SENSOR PCM Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - Diagnostic Test 1. O2 SENSOR ABOVE 3.7 VOLTS NOTE: When only one O2 Sensor is shorted to voltage, the scan tool will display all O2 Sensor voltage Allow the engine to reach normal operating temperature. With a scan tool, read the 1/2 O2 Sensor voltage. Is the voltage above 3.7 volts? Yes >> Go To 2 No >> Refer to the INTERMITTENT CONDITION Diagnostic Procedure. Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) 2. (K141) O2 1/2 SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE Start the engine and allow the engine to idle. Disconnect the 1/2 O2 Sensor harness connector. Measure the voltage on the (K141) O2 Sensor 1/2 Signal circuit in the NOTE: Measure the voltage in reference to ground, not the (K904) Is the voltage above 5.2 volts? Yes >> Repair the short to battery voltage in the (K141) O2 Sensor 1/2 Signal circuit. Perform the POWERTRAIN VERIFICATION TEST. (Refer to No >> Go To 3 9 - 142 ENGINE ELECTRICAL DIAGNOSTICS KJ |