P0058
DTC P0058 OXYGEN SENSOR HEATER CONTROL CIRCUIT HIGH (BANK 2 SENSOR 2)HINT:
- Bank 1 refers to the bank that includes cylinder No. 1.
- Bank 2 refers to the bank that does not include cylinder No. 1.
- Bank 1 includes cylinder No. 1, but bank 2 does not. Cylinder No. 1 is located in the front part of the engine, opposite the transmission.
- Sensor 1 refers to the sensor closest to the engine body.
- Sensor 2 refers to the sensor farthest away from the engine body.
CIRCUIT DESCRIPTION
DTC Detection Condition:
The Heated Oxygen Sensor (HO2S) is used to monitor oxygen concentration in the exhaust gas. For optimum catalytic converter operation, the air-fuel mixture must be maintained near the ideal stoichiometric ratio. The HO2S output voltage changes suddenly in the vicinity of the stoichiometric ratio. The ECM adjusts the fuel injection time so that the air-fuel ratio is nearly stoichiometric.The HO2S generates a voltage between 0.1 and 0.9 V in response to oxygen concentration in the exhaust gas.
If the oxygen concentration in the exhaust gas increases, the air-fuel ratio is called LEAN. The HO2S voltage drops below 0.45 V, which informs the ECM of the LEAN condition.
If oxygen is not in the exhaust gas, the air-fuel ratio is called RICH. The HO2S voltage increases above 0.45 V, which informs the ECM of the RICH condition.
HINT: The ECM provides a pulse width modulated control circuit to adjust current through the heater. The HO2S heater circuit uses a relay on the +B side of the circuit.
MONITOR DESCRIPTION
Monitor Strategy:
Typical Enabling Conditions Part 1:
Typical Enabling Conditions Part 2:
Typical Malfunction Thresholds:
Component Operating Range:
The sensing portion of the HO2S has a zirconia element which is used to detect oxygen concentration in the exhaust. If the zirconia element is at the proper temperature and the difference of the oxygen concentration between the inside and outside surface of sensor is large, the zirconia element will generate voltage signals. In order to increase the oxygen concentration detecting capacity in the zirconia element, the ECM supplements the heat from the exhaust with heat from a heating element inside the sensor. When current in the HO2S heater is out of the standard operating range, the ECM interprets this as a fault in the HO2S heater. The ECM illuminates MIL and sets DTC.
Normally, the HO2S heater current is 0.4 to 1.0 A.
The monitor runs if all the conditions below the met:
- Engine is started and the vehicle is driven immediately.
- Drive the vehicle over 40 km/h (25 mph) for 10 minutes.
MONITOR RESULT
Refer to Monitor Trips and/or Drive Cycle.
The test value and test limit information are described as shown in the table.Check the monitor result and test values after performing the monitor drive pattern.
- TID (Test identification Data. is assigned to each emissions-related component.
- TLT (Test Limit Type.: If TLT is 0, the component is malfunctioning when the test value is higher than the test limit. If TLT is 1, the component is malfunctioning when the test value is lower than the test limit.
- CID (Component identification Data. is assigned to each test value.
- Unit Conversion is used to calculate the test value indicated on generic OBD II scan tools.
Wiring Diagram:
Step 1 - 3:
Step 4 - 5:
INSPECTION PROCEDURE
HINT: Read freeze frame data using the hand-held tester. Freeze frame data records the engine conditions when a malfunction is detected.When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was LEAN or RICH, and other data from the time the malfunction occurred.