DTC P0132. Chevrolet Impala 2003

For 1990-2009 cars only

Makes 🢒 Chevrolet 🢒 2003 🢒 Impala 🢒 DTC 🢒 DTC P0132

Circuit Description

Heated oxygen sensors (HO2S) are used for fuel control and post catalyst monitoring. Each HO2S compares the oxygen content of the surrounding air with the oxygen content of the exhaust stream. When the vehicle is first started, the powertrain control module (PCM) operates in an Open Loop mode, ignoring the HO2S signal voltage when calculating the air-to-fuel ratio. The PCM supplies the HO2S with a reference or bias voltage of about 450 mV. The HO2S generates a voltage within a range of 0-1,000 mV that fluctuates above and below bias voltage once in Closed Loop. A high HO2S voltage output indicates a rich fuel mixture. A low HO2S voltage output indicates a lean mixture. Heating elements inside the HO2S minimize the time required for the sensors to reach operating temperature, and provide an accurate voltage signal. If the PCM detects that the HO2S 1 voltage remains above a calibrated amount for an excessive amount of time, DTC P0132 will set.

Each HO2S has the following circuits:

•	HO2S 1 high signal

•	HO2S 1 low signal

•	HO2S 1 heater ignition 1 voltage

•	HO2S 1 heater ground

Conditions for Running the DTC

•	DTCs P0101, P0102, P0103, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0121, P0122, P0123, P0125, P0128, P0201, P0202, P0203, P0204, P0205, P0206, P0410, P0440, P0442, P0443, P0446, P0449, or P1441 are not set.

•	The TP sensor parameter is between 3-40 percent.

•	The system voltage is between 9-18 volts.

Conditions for Setting the DTC

The PCM detects that the HO2S 1 voltage is more than 976 mV in closed loop for more than 55 seconds.

The PCM detects that the HO2S 1 voltage is more than 200 mV in decel fuel cut-off (DFCO) for more than 32 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 Description

The numbers below refer to the step numbers on the diagnostic table.

A normally functioning HO2S 1 voltage signal will fluctuate above and below the bias voltage amount.

A voltage reading other than bias voltage in this step indicates a short circuit condition in the high signal circuit.

The conditions listed in the table may contribute to the failure of the HO2S. The conditions listed apply only to this type of failure.

Step

Action

Values

Yes

Schematic Reference: Engine Controls Schematics

Connector End View Reference: Engine Controls Connector End Views or Powertrain Control Module Connector End Views

Did you perform the Diagnostic System Check-Engine Controls?

Go to Step 2

Go to Diagnostic System Check - Engine Controls

Start the engine.
Allow the engine to idle at operating temperature.
Clear the DTC and record the Freeze/Frame Failure Records data.
Observe the heated oxygen sensor (HO2S) 1 voltage parameter with a scan tool.

Is the HO2S 1 voltage more than the specified value?

975 mV

Go to Step 4

Go to Step 3

Observe the Freeze Frame/Failure Records for this DTC.
Turn OFF the ignition for 30 seconds.
Start the engine.
Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records.

Did the DTC fail this ignition?

Go to Step 4

Go to Intermittent Conditions

Disconnect the HO2S 1 connector.
Connect a 3-amp fused jumper wire between the HO2S 1 low signal circuit and a good ground.
Turn ON the ignition, with the engine OFF.
Observe the HO2S 1 voltage parameter with a scan tool.

Does the HO2S voltage read more than the amount specified?

975 mV

Go to Step 5

Go to Step 9

Measure the voltage from the high signal circuit of the HO2S 1 harness connector, on the engine harness side, to a good ground with a DMM .

Is the HO2S 1 voltage above the specified value?

5.5 V

Go to Step 7

Go to Step 6

Turn OFF the ignition.
Connect a 3-amp fused jumper wire between the HO2S 1 high signal circuit and a good ground.
Start the engine.
Observe the scan tool for at least 30 seconds.

Do any 5-volt reference circuit DTCs set?

Go to Step 8

Go to Step 7

Important: Disconnection of the PCM during testing may eliminate the voltage source that caused this fault.

Test the HO2S 1 high signal circuit for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 14

Go to Step 11

Important: Disconnection of the PCM during testing may eliminate the voltage source that caused the fault.

Test the HO2S 1 high signal circuit for a short to the affected 5-volt reference circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 14

Go to Step 11

Inspect for the following conditions that may affect the HO2S operation:

Notice: Refer to Silicon Contamination of Heated Oxygen Sensors Notice in the Preface section.

•	HO2S contamination

Inspect the HO2S for contamination.

Notice: Refer to Heated Oxygen and Oxygen Sensor Notice in the Preface section.

•	Chafed, burnt, cut, pinched, or otherwise damaged HO2S wiring

•	The HO2S must have a clean air reference in order to function properly. This clean air reference is obtained by way of the HO2S wires. Obstruction of the air reference and degraded HO2S performance could result from any attempt to repair the above conditions.

•	Exhaust system leaks or restrictions

•	Evaporative emissions (EVAP) system malfunction--Inspect the EVAP control system. Refer to Inspection/Maintenance Evaporative Emission System Set .

•	The fuel pressure

Incorrect fuel pressure can affect HO2S operation. Refer to Fuel System Diagnosis .

Did you find and correct the condition?

Go to Step 14

Go to Step 10

Test for an intermittent and for a poor connection at the harness connector of the HO2S 1. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 14

Go to Step 11

Test for an intermittent and for a poor connection at the harness connector of the PCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 14

Go to Step 12

Replace the HO2S 1. Refer to Heated Oxygen Sensor 1 Replacement .

Did you complete the replacement?

Go to Step 14

Replace the PCM. Refer to Powertrain Control Module Replacement .

Did you complete the replacement?

Go to Step 14

Clear the DTCs with a scan tool.
Turn OFF the ignition for 30 seconds.
Start the engine.
Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records.

Did the DTC fail this ignition?

Go to Step 2

Go to Step 15

Observe the Capture Info with a scan tool.

Are there any DTCs that have not diagnosed?

Go to Diagnostic Trouble Code (DTC) List

System OK