P0160

DTC P0160 HO2S Insufficient Activity Bank 2 Sensor 2 (1 Of 2):

DTC P0160 HO2S Insufficient Activity Bank 2 Sensor 2 (2 Of 2):

HO2S Circuit:

CIRCUIT DESCRIPTION
The Vehicle Control Module (VCM) supplies a voltage of about 0.45 V (450 mV) between the HO2S High and the HO2S Low circuits. (If measured with a 10 megohm digital voltmeter, this may read as low as 0.32 V.) The Heated Oxygen Sensor HO2S (Bank 2 Sensor 2) varies the voltage within a range of about 1.0 V if the exhaust is rich, down through about 0.10 V if exhaust is lean.

The sensor is like an open circuit and produces no voltage when it is below 360°C (600°F). The HO2S heater provides for faster sensor warm-up which allows the sensor to become active in a shorter period of time and remain active during long extended idle. DTC P0160 determines if the HO2S or the HO2S circuit has developed an open. DTC P0160 is a type A DTC.

CONDITIONS FOR SETTING THE DTC

^ No Throttle Position (TP) sensor DTCs.
^ No Evaporative Emissions (EVAP) DTCs.
^ No Intake Air Temperature (IAT) sensor DTCs.
^ No Manifold Absolute Pressure (MAP) sensor DTCs.
^ No Engine Coolant Temperature (ECT) sensor DTCs.
^ No Mass Air Flow (MAF) sensor DTCs.
^ No intrusive test in progress.
^ No device controls active System voltage is at least 9 V.

Open Test Enable

^ Engine run time is at least 2 minutes.
^ DTC P0157 not active.
^ Closed Loop.
^ HO2S (Bank 2 Sensor 2) voltage is greater than 399 mV but less than 473 mV.

ACTION TAKEN WHEN THE DTC SETS
With a current DTC set, the VCM will turn ON the Malfunction Indicator Lamp (MIL).

CONDITIONS FOR CLEARING THE MIL/DTC
The VCM turns the MIL off after 3 consecutive driving trips without a fault condition present. A history DTC will clear if no fault conditions have been detected for 40 warm-up cycles (coolant temperature has risen 40°F from the start-up coolant temperature and the engine coolant temperature exceeds 160°F during that same ignition cycle) or the scan tool clearing feature has been used.

DIAGNOSTIC AIDS
An intermittent may be caused by a poor connection, rubbed through wire insulation, or a wire broken inside the insulation.

Check for the following:

^ Poor connection or damaged harness - Inspect harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, poor terminal to wire connection, and damaged harness.
^ Faulty HO2S (Bank 2 Sensor 2) heater or heater circuit - With the ignition ON, engine OFF the HO2S (Bank 2 Sensor 2) voltage displayed on a scan tool should gradually drop to below 0.300 V, indicating that the heater is working properly. If not, disconnect the HO2S (Bank 2 Sensor 2) and connect a test light between terminals C and D. If the test light does not light, repair the open in the affected circuit. If the test light lights, replace HO2S (Bank 2 Sensor 2).
^ Intermittent test - With a scan tool, monitor HO2S (Bank 2 Sensor 2) signal voltage while moving related connectors and wiring harness, with a warm engine running at pan throttle in Closed Loop. If the failure is induced, the HO2S (Bank 2 Sensor 2) signal voltage reading will change from its normal fluctuating voltage (above 600 mV and below 300 mV) to a fixed value around 450 mV. This may help to isolate the location of the malfunction.
^ Never solder the HO2S wires. For proper wire and connector repair, refer to Wiring Repairs in Engine Electrical.

TEST DESCRIPTION
Number(s) below refer to the step number(s) on the Diagnostic Table.

2. If the conditions for setting DTC P0160 exist, the system will not go into Closed Loop.
3. This will determine if the sensor or the wiring is the cause of DTC P0160.