P0132

DTC P0132

CIRCUIT DESCRIPTION




The wide band heated oxygen sensor (HO2S) measures the amount of oxygen in the exhaust stream more quickly and accurately than the switching style HO2S. The wide band sensor consists of an oxygen sensing cell, an oxygen pumping cell, and a heater. The exhaust gas sample passes through a diffusion gap between the sensing cell and the pumping cell. The engine control module (ECM) supplies a signal voltage to the HO2S and uses this voltage as a reference to the amount of oxygen in the exhaust system. An electronic circuit within the ECM controls the pump current through the oxygen pumping cell in order to maintain a constant signal voltage. The ECM monitors the voltage variation on the signal circuit and attempts to keep the voltage constant by increasing or decreasing the amount of current flow or reversing the direction of the current flow to the pumping cell. By measuring the direction and amount of current required to maintain the signal voltage, the ECM can determine the concentration of oxygen in the exhaust. The signal voltage is displayed as a lambda value. A lambda value of 1 is equal to a stoichiometric air fuel ratio of 14.7:1. Under normal operating conditions, the lambda value will remain around 1. When the system is lean, the oxygen level will be high and the lambda signal will be high or more than 1. When the system is rich, the oxygen level is low and the lambda signal will be low or less than 1. The ECM uses this information to maintain the proper air/fuel ratio. If the ECM detects a fault, DTC P0132 will set for bank 1 sensor 1 or DTC P0152 will set for bank 2 sensor 1.

CONDITIONS FOR RUNNING THE DTC
- DTCs P0138, P0139, P0158, P0159 are not set.
- The engine is running.
- The Loop Status bank 1 sensor 1 or bank 2 sensor 1 is closed.
- The Loop Status bank 1 sensor 2 or bank 2 sensor 2 is closed

CONDITIONS FOR SETTING THE DTC
- The ECM detects that the HO2S 1 lambda value is greater than 1.030 or less than 0.970 and the same bank HO2S 2 sensor is 660 mV.
- The condition exists for more than 100 seconds.

ACTION TAKEN WHEN THE DTC SETS
- The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
- The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.

CONDITIONS FOR CLEARING THE MIL/DTC
- The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
- A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
- A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
- Clear the MIL and the DTC with a scan tool.

TEST

Steps 1-7:

Steps 8-18:

Steps 19-25:

Steps 26-30: