DTC P2243 (LPL or LPV)
Diagnostic Instructions
DTC Descriptor
| DTC P2243: HO2S Reference Voltage Circuit
Sensor 1 |
Diagnostic Fault Information
The DTC is set when there is an open HO2S circuit detected by
the control module.
Perform the HO2S Test.
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
| • |
The ignition voltage is
between 10–18 V. |
| • |
DTC P2243 runs continuously
when the above conditions are met for 2 s. |
Conditions for Setting the DTC
P2243
| • |
The ECM detects an open
circuit on the reference voltage circuit. |
| • |
DTC P2243 sets within 4 s when
the above condition is met continuously, or within 50 s when the
above condition is met cumulatively. |
Action Taken When the DTC Sets
DTC P2243 is a Type B DTC.
Conditions for Clearing the DTC
DTC P2243 is a Type B DTC.
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
| 1. |
Verify that the HO2S connector
is connected. |
| 2. |
Perform the HO2S Test.
|
| 4. |
If DTC P2243 resets perform
the Circuit/System Testing. |
Circuit/System Testing
Note: All modules must be
powered down or misdiagnosis may result.
Note: Perform the
Circuit/System Verification first before starting the
Circuit/System Testing.
| 1. |
Ignition OFF, disconnect the
scan tool and wait 60 s to ensure all modules are powered
down. |
| 2. |
Disconnect the harness
connector at the B52 Heated Oxygen Sensor. |
| 3. |
Ignition ON, verify the scan
tool HO2S 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. |
| 4. |
Ignition ON, install a 3 A
fused jumper wire at the B52 Heated Oxygen Sensor high signal
circuit terminal 3. Toggle the jumper wire between the B52 Heated
Oxygen Sensor low signal circuit terminal 4 and the battery voltage
and also between the B52 Heated Oxygen Sensor low signal circuit
terminal 3 and earth. 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 circuits test normal, replace the K20
Engine Control Module. |
| 5. |
If all circuits test normal,
replace the B52 Heated Oxygen Sensor. |
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic
procedure.
Control Module References for ECM replacement, programming, and
setup
|
