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P0152-O2 SENSOR 2/1 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 (K43) O2 2/1 SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE (K902) O2 RETURN UPSTREAM CIRCUIT SHORTED TO BATTERY VOLTAGE (K43) O2 2/1 SIGNAL CIRCUIT OPEN (K902) O2 RETURN UPSTREAM CIRCUIT OPEN O2 SENSOR PCM Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - Diagnostic Test 1. O2 SENSOR ABOVE 3.99 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 2/1 O2 Sensor voltage. Is the voltage above 3.99 volts? Yes >> Go To 2 No >> Refer to the INTERMITTENT CONDITION Diagnostic Procedure. Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) HB ENGINE ELECTRICAL DIAGNOSTICS 9 - 199 |