DTC P0131 or P0132
Diagnostic Instructions
DTC Descriptors
DTC P0131 01: HO2S Circuit Low Voltage
Sensor 1
DTC P0131 12: HO2S Circuit Low Voltage
Sensor 1
DTC P0131 52: HO2S Circuit Low Voltage
Sensor 1
DTC P0131 5A: HO2S Circuit Low Voltage
Sensor 1
DTC P0132 02: HO2S Circuit High Voltage
Sensor 1
DTC P0132 11: HO2S Circuit High Voltage
Sensor 1
DTC P0132 52: HO2S Circuit High Voltage
Sensor 1
DTC P0132 5B: HO2S Circuit High Voltage
Sensor 1
Diagnostic Fault Information
|
Circuit
|
Short to Ground
|
Open/High Resistance
|
Short to Voltage
|
Signal Performance
|
|
Heater Voltage Supply
|
P0030 00
|
P0030 00
|
-
|
P0131 5A, P0131 12
|
|
Reference Voltage (Signal)
|
P0131 01
|
P0131 12, P2243 00, P2231 00
|
P0131 02, P2231 00
|
P0133 00, P0131 52, P0131 5A, P0132 52,
P0132 5B
|
|
Signal (Pump Current)
|
P2626 00
|
P2626 00
|
P2626 00, P2231 00
|
-
|
|
Signal (Trim Current)
|
P2626 00
|
P2626 00
|
P2626 00
|
-
|
|
Heater Low Control
|
P0031 00
|
P0030 00
|
P0032 00
|
-
|
|
Low Reference (Ground)
|
P2A00 00
|
P0132 02, P2243 04
|
P0132 02
|
-
|
Typical Scan Tool Data
HO2S Bank 1
Sensor 1
|
HO2S Sensor Voltage Circuits
|
Normal Range
|
Short to Ground
|
Open
|
Short to Voltage
|
|
HO2S High Signal
|
0-1 000 mV
|
0-90 mV
|
350-550 mV
|
Approximately 1 100 mV
|
|
HO2S Low Signal
|
0-1 000 mV
|
0-1 000 mV
|
0-1 000 mV
|
0-1 100 mV
|
Circuit/System 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 60:1. 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 value will be high, or more
than 1. When the system is rich, the oxygen level is low and
the lambda value will be low, or less than 1. The ECM uses
this information to maintain the proper air/fuel ratio.
Conditions for Running the DTC
P0131 and P0132
| • |
The system voltage is between 10-18 V. |
| • |
The scan tool special functions are not
active |
| • |
The Throttle Position Indicated Angle parameter is
between 3-90%. |
| • |
The Loop Status parameter is closed. |
| • |
The traction control is not active. |
| • |
The above conditions must be met for at least
5 s. |
Conditions for Setting the DTC
P0131
| • |
The ECM detects that the HO2S 1 signal
voltage is less than 50 mV for more than 2 s. |
| • |
This diagnostic runs continuously. |
P0132
| • |
The ECM detects that the HO2S 1 signal
voltage is more than 1 050 mV for more than
2 s. |
| • |
This diagnostic runs continuously. |
Action Taken When the DTC Sets
DTCs P0131 and P0132 are Type B DTCs.
Conditions for Clearing the DTC
DTCs P0131 and P0132 are Type B DTCs.
Reference Information
Schematic Reference
Engine Controls Schematics
Connector End View Reference
Component Connector End Views
Electrical Information Reference
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
- Clear the DTCs with a scan tool.
- Operate the vehicle within the conditions for running
and setting the DTC. The DTC should not set.
- 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 data.
Circuit/System Testing
Note: All modules must be
powered down or misdiagnosis may result.
- Ignition OFF, disconnect the scan tool and wait
60 s to ensure all modules are powered down.
- Disconnect the harness connector at the
B52A Heated Oxygen Sensor 1
- Test for less than 5 Ω between the low reference
circuit terminal 2 X1 and ground.
| ⇒ |
If more than the specified range, test the low
reference circuit for an open/high resistance. If the circuit tests
normal, replace the K20 Engine Control Module. |
- Ignition ON, verify the scan tool HO2S Bank 1
Sensor 1 parameter is approximately 450 mV.
| ⇒ |
If more than the specified value, test the signal
circuit for a short to voltage. If the circuit tests normal,
replace the K20 Engine Control Module. |
| ⇒ |
If less than the specified value, test the signal
circuit for a short to ground. If the circuit tests normal, replace
the K20 Engine Control Module. |
- Ignition ON, install a 3 A fused jumper wire at
the HO2S high signal circuit terminal B. Toggle the jumper
wire between the HO2S low signal circuit terminal A and the
battery voltage. Verify the appropriate scan tool HO2S parameter
toggles between 0 mV and approximately
1 000 mV.
| ⇒ |
If the appropriate scan tool HO2S parameter does
not toggle correctly, test the HO2S high signal circuit for an
open/high resistance. If the circuit tests normal, replace the
K20 Engine Control Module. |
- If all circuits test normal, replace the appropriate
HO2S Sensor.
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic
procedure.
|
