DTC P2297 - LPL or LPV
Diagnostic Instructions
DTC Descriptor
DTC P2297 00: HO2S Performance During
Deceleration Fuel Cut-Off Sensor 1
Diagnostic Fault Information
Circuit
|
Short to Ground
|
Open/High Resistance
|
Short to Voltage
|
Signal Performance
|
Reference Voltage (Signal)
|
P0131 02, P0131 03
|
P0131 02, P0131 03
|
P0132 01, P2231 07, P2297 00
|
P0130 00, P0133 00, P0134 00
|
Low Reference (Ground)
|
P0131 02, P0131 03
|
P0131 02, P0131 03
|
P0131 02, P0131 03, P2297 00
|
-
|
Typical Scan Tool Data
HO2S Sensor 1
Circuit
|
Short to Ground
|
Open
|
Short to Voltage
|
Operating Conditions: Engine operating
in closed loop.
Parameter Normal Range: Fluctuates
above and below 350-500 mV
|
Signal HO2S Sensor 1
|
0 V
|
400-415 mV
|
1 000 mV
|
Low Reference
|
-
|
400-415 mV
|
1 000 mV
|
Circuit/System Description
The heated oxygen sensors (HO2S) are used for fuel control
and catalyst monitoring. Each HO2S compares the oxygen content of
the surrounding air with the oxygen content of the exhaust stream.
When the engine is started, the control module operates in an open
loop mode, ignoring the HO2S signal voltage while calculating the
air-to-fuel ratio. The control module supplies the HO2S with a
reference, or bias voltage of about 450 mV. While the engine
runs, the HO2S heats up and begins to generate a voltage within a
range of 0-1.000 mV. This voltage will fluctuate above and
below the bias voltage. Once sufficient HO2S voltage fluctuation is
observed by the control module, closed loop is entered. The control
module uses the HO2S voltage to determine the air-to-fuel ratio. An
HO2S voltage that increases above bias voltage toward 1.000 mV
indicates a rich fuel mixture. An HO2S voltage that decreases below
bias voltage toward 0 mV indicates a lean fuel mixture.
The heating elements inside each HO2S heat the sensor to bring
the sensor up to operating conditions faster. This allows the
system to enter closed loop earlier and the control module to
calculate the air to fuel ratio sooner.
The HO2S sensors utilises the following circuits:
• |
A low reference circuit |
• |
An ignition voltage circuit |
• |
A heater control circuit |
Conditions for Running the DTC
• |
DTCs P0117 00, P0118 00,
P0336 00, P0401 00, P0402 00, P0404 00,
P0405 00 and P0406 00 are not set. |
• |
The engine has been running for greater than
60 s. |
• |
The engine is in deceleration fuel cut off
mode. |
• |
The start-up engine coolant temperature is greater
than 60°C (140°F). |
• |
The ignition voltage is between 10-16 V. |
• |
The DTCs run continuously when the above
conditions are met for 2 s. |
Conditions for Setting the DTC
The engine control module (ECM) detects that the HO2S
Sensor 1 voltage is greater than 550 mV during
deceleration fuel cut off mode.
Action Taken When the DTC Sets
DTC P2297 00 is a Type B DTC.
Conditions for Clearing the DTC
DTC P2297 00 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
- Engine running, observe the scan tool HO2S
Sensor 1 voltage parameter. The reading should fluctuate above
and below the range of 350-550 mV.
- Operate the vehicle within the conditions for running
the DTC to verify the DTC does not reset. You may also operate the
vehicle within the conditions that you observed from the freeze
frame/failure records data.
Circuit/System Testing
- Ignition OFF, disconnect the scan tool and wait
60 s to ensure all modules are powered down.
- Disconnect the harness connector at the
B52 Heated Oxygen Sensor.
- 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. |
- 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 ground. 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
B52 Heated Oxygen Sensor.
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic
procedure.
|