DTC P0132 or P0152. Cadillac DeVille 2005

For 1990-2009 cars only

Makes 🢒 Cadillac 🢒 2005 🢒 DeVille 🢒 Engine 🢒 Engine Controls - 4.6L 🢒 DTC P0132 or P0152

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 the sensor reaches operating temperature. 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 for bank 1 sensor 1 or DTC P0152 will set for bank 2 sensor 1.

DTC Descriptors

This diagnostic procedure supports the following DTCs:

•	DTC P0132 HO2S Circuit High Voltage Bank 1 Sensor 1

•	DTC P0152 HO2S Circuit High Voltage Bank 2 Sensor 1

Conditions for Running the DTC

•	DTCs P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0121, P0122, P0123, P0201-P0208, P0410, P0412, P0418, P0419, P0442, P0443, P0446, P0449, P0455 are not set.

•	The system voltage is between 10-18 volts.

•	The TP Sensor parameter is between 3-25 percent.

•	The Loop Status parameter is closed.

•	The Air Fuel Ratio parameter is between 14.5-14.8.

•	DTC P0132 and P0152 run continuously once the above conditions are met for more than 3 seconds.

Conditions for Setting the DTC

The PCM detects that the HO2S 1 voltage is more than 950 mV for more than 10 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.

Step

Action

Values

Yes

Schematic Reference: Engine Controls Schematics

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

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle in Vehicle DTC Information

Start the engine.
Allow the engine to idle at operating temperature. Refer to Scan Tool Data List .
Clear the DTC and record the Freeze Frame/Failure Records.
Observe the affected HO2S 1 parameter with a scan tool.

Is the voltage more than the specified value?

900 mV

Go to Step 4

Go to Step 3

Observe the Freeze Frame/Failure Records for this DTC.
Turn OFF the ignition for 60 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

Turn OFF the ignition.
Disconnect the affected heated oxygen sensor (HO2S).
Turn ON the ignition, with the engine OFF.
Observe the affected HO2S voltage parameter with a scan tool.

Is the voltage more than the specified value?

900 mV

Go to Step 5

Go to Step 6

Important: Disconnection of the powertrain control module (PCM) during testing may eliminate the voltage source that caused this fault.

Test the affected HO2S 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 13

Go to Step 10

Measure the voltage from the affected HO2S low signal circuit, on the engine harness side, to a good ground with a DMM.

Is the voltage more than the specified value?

100 mV

Go to Step 7

Go to Step 8

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

Test the affected HO2S low 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 13

Go to Step 10

Inspect for the following 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

•	Any water intrusion into the HO2S connector

•	Engine oil contaminated with fuel

•	Any rich fuel injectors--Refer to Fuel Injector Balance Test with Tech 2 .

•	An inaccurate mass air flow (MAF) sensor--Refer to Scan Tool Data List .

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

•	Incorrect fuel pressure--Refer to Fuel System Diagnosis .

Did you find and correct the condition?

Go to Step 13

Go to Step 9

Test for shorted terminals and for poor connections at the affected HO2S 1. Refer to Testing for Intermittent Conditions and Poor Connections , Connector Repairs , and Heated Oxygen Sensor Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 13

Go to Step 11

Test for shorted terminals and for poor connections at the powertrain control module (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 13

Go to Step 12

Notice: Refer to Heated Oxygen Sensor Resistance Learn Reset Notice in the Preface section.

Replace affected HO2S. Refer to Heated Oxygen Sensor Replacement - Bank 1 Sensor 1 or Heated Oxygen Sensor Replacement - Bank 2 Sensor 1 .

Did you complete the replacement?

Go to Step 13

Replace the PCM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.

Did you complete the replacement?

Go to Step 13

Clear the DTCs with a scan tool.
Turn OFF the ignition for 60 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 14

Observe the Capture Info with a scan tool.

Are there any DTCs that have not been diagnosed?

Go to Diagnostic Trouble Code (DTC) List - Vehicle in Vehicle DTC Information

System OK