SFI SYSTEM (w/ Electronic Throttle Control System), Diagnostic DTC:P0132

DTC Code DTC Name
P0132 Oxygen Sensor Circuit High Voltage Bank1 Sensor1

DESCRIPTION

In order to obtain a high purification rate for the carbon monoxide (CO), hydrocarbon (HC) and nitrogen oxide (NOx) components in the exhaust gas, a Three-Way Catalytic Converter (TWC) is used. For the most efficient use of the TWC, the air-fuel ratio must be precisely controlled so that it is always close to the stoichiometric air-fuel ratio. The heated oxygen sensor has the characteristic whereby its output voltage changes suddenly in the vicinity of the stoichiometric air-fuel ratio. This is used to detect the oxygen concentration in the exhaust gas and provide the ECM with feedback to control the air-fuel ratio. When the air-fuel ratio becomes lean, the oxygen concentration in the exhaust gas increases. The heated oxygen sensor informs the ECM of the lean condition (low voltage, i.e. less than 0.45 V). When the air-fuel ratio is richer than the stoichiometric air-fuel level, the oxygen concentration in the exhaust gas is reduced. And the heated oxygen sensor informs the ECM of the rich condition (high voltage, i.e. more than 0.45 V). The ECM judges by the voltage output of the heated oxygen sensor whether the air-fuel ratio is rich or lean and controls the injection time accordingly. If a malfunction of the heated oxygen sensor causes an output of abnormal voltage, the ECM is unable to perform accurate air-fuel ratio control. The heated oxygen sensor includes a heater which heats the zirconia element. The heater is controlled by the ECM. When the intake air volume is low (the temperature of the exhaust gas is low), a current flows to the heater in order to heat the sensor for accurate oxygen concentration detection.

A0137QPE01
DTC No. DTC Detection Condition Trouble Area
P0132 Heated oxygen sensor (sensor 1) output voltage is 1.5 V or more for 5 second or more (3 trip detection logic).

  • Short in signal output circuit and power source circuit of heated oxygen sensor (sensor 1)

  • Heated oxygen sensor (sensor 1)

  • ECM

Tech Tips

Sensor 1 refers to the sensor near the engine assembly.

WIRING DIAGRAM

A0136ZHE01

CONFIRMATION DRIVING PATTERN

DTC P0132 is detected when the vehicle is driven in the city at an average vehicle speed of approximately 50 km/h (31 mph) in an inner city for approximately 30 minutes.

INSPECTION PROCEDURE

Tech Tips

Read freeze frame data using the intelligent tester. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, 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.

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (OXYGEN SENSOR (SENSOR 1) - ECM)


    1. A01390PE01

      Disconnect the B21 heated oxygen sensor connector (sensor 1).

    2. Disconnect the B26 ECM connectors.

    3. Measure the resistance.

      Standard resistance (check for short)
      Tester Connection Specified Condition
      OX (B21-3) or OX1A (B26-18) - HT (B21-1) or HT1A (B26-21) 10 kΩ or higher
      OX (B21-3) - +B (B21-2) 10 kΩ or higher

    4. Reconnect the heated oxygen sensor connector.

    5. Reconnect the ECM connectors.

      A0138NYE04

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR

    OK

    REPLACE HEATED OXYGEN SENSOR (SENSOR 1)