DTC Advanced Diagnostics: P2252
DTC P2252:Air/Fuel Ratio (A/F) Sensor (Sensor 1) VS Circuit Low Voltage

General Description
USA and Canada models

Mexico models

The air/fuel ratio (A/F) sensor (sensor 1) is installed in the exhaust manifold and detects oxygen content in the exhaust gas. The A/F sensor (sensor 1) transmits a signal to the powertrain control module (PCM), and the PCM controls fuel injection duration by comparing the target air/fuel ratio with the A/F sensor (sensor 1) signal. When the self-diagnosis function in the PCM detects a short circuit failure, the heater stops, and if the condition continues for a specified time, or if the VS terminal voltage is a specified value after a current is applied to the pump cell for a specified time, the PCM detects VS line short to ground and stores a DTC.

Monitor Execution, Sequence, Duration, DTC Type
Execution
Continuous
Sequence
None
Duration
5 seconds or more
DTC Type
Two drive cycles, MIL on

Enable Conditions
Condition
Minimum
Maximum
12 volt battery voltage [BATTERY]
9.0 V
–
State of the engine
Running
[ ]: HDS Parameter

Malfunction Threshold
One of these symptoms occurs:
The PCM detects VS line short to ground after the self-diagnosis function in the PCM judges as an occurrence of short circuit for at least 5 seconds.
The VS terminal voltage is 2.6 V or less after a current is applied to the sensor pump cell for at least 0.5 second.

Possible Cause
NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
A/F sensor (sensor 1) VS line short to ground
A/F sensor (sensor 1) failure
PCM internal circuit failure

Confirmation Procedure
Operating Condition
1.
Start the engine. Hold the engine speed [ENGINE SPEED] at 3,000 rpm without load (CVT in P or N, M/T in neutral) until the radiator fan comes on.
2.
Let the engine idle for at least 2 minutes.
With the HDS
None.

Diagnosis Details
Conditions for setting the DTC
When a malfunction is detected during the first drive cycle, a Pending DTC is stored in the PCM memory. If the malfunction returns in the next (second) drive cycle, the MIL comes on and a Confirmed DTC and the freeze data are stored.

Conditions for clearing the DTC
The MIL is cleared if the malfunction does not return in three consecutive trips in which the diagnostic runs. The MIL, the Pending DTC, the Confirmed DTC, and the freeze data can be cleared with the scan tool Clear command or by disconnecting the 12 volt battery.