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P0138-O2 SENSOR 1/2 CIRCUIT HIGH (CONTINUED) For the Engine circuit diagram (Refer to 9 - ENGINE - SCHEMATICS AND DIAGRAMS). For a complete wiring diagram Refer to Section 8W. • When Monitored: • Set Condition: Possible Causes (K141) O2 1/2 SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE (K904) O2 RETURN DOWNSTREAM CIRCUIT SHORTED TO BATTERY VOLTAGE (K141) O2 1/2 SENSOR SIGNAL CIRCUIT OPEN (K904) O2 RETURN DOWNSTREAM CIRCUIT OPEN O2 SENSOR PCM Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - Diagnostic Test 1. O2 SENSOR ABOVE 3.9 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 3.9 volts? Yes >> Go To 2 No >> Refer to the INTERMITTENT CONDITION Diagnostic Procedure. Perform POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) 9 - 158 ENGINE ELECTRICAL DIAGNOSTICS ND |