Honda Element. Manual — part 82

Enable Conditions

ENABLE CONDITIONS

Malfunction Threshold

The BARO sensor output voltage value is 4.49 V or more for at least 2 seconds.

Diagnosis Details

Conditions for illuminating the MIL

When a malfunction is detected, the MIL comes on and the DTC and the freeze frame data are stored in the
ECM/PCM memory.

Conditions for clearing the MIL

The MIL will be cleared if the malfunction does not recur during three consecutive trips in which the diagnostic
runs.

The MIL, the DTC, and the freeze frame data can be cleared by using the scan tool Clear command or by
disconnecting the battery.

DTC P2238 (48): ADVANCED DIAGNOSTICS

DTC P2238: AIR/FUEL RATIO (A/F) SENSOR (SENSOR 1) AFS+ CIRCUIT LOW VOLTAGE

OBD Status

N/A

Condition

Ignition switch

ON

No active DTCs

P1109, P2228

2007 Honda Element EX

2007 ENGINE PERFORMANCE Advanced Diagnostics - Element

Fig. 237: Air/Fuel Ratio (A/F) Sensor 1 Circuit Diagram

General Description

The air/fuel ratio (A/F) sensor (sensor 1) is installed in the exhaust system and detects oxygen content in the
exhaust gas. The A/F sensor transmits a signal to the engine control module (ECM)/powertrain control module
(PCM). A heater for the sensor element is embedded in the A/F sensor (sensor 1). It heats the sensor to stabilize
and speed up the detection of oxygen content. The increase in current through the heater levels off as the
voltage applied to the electrode reaches a certain range because the amount of oxygen that goes through the
diffusion layer is limited. The current is proportional to oxygen content in the exhaust gas, so the air/fuel ratio is
detected by the measurement of the current. The ECM/PCM compares a set target air/fuel ratio with the
detected air/fuel ratio and controls the fuel injection duration.

If the A/F sensor (sensor 1) voltage is low, the air/fuel ratio is lean, and the ECM/PCM uses A/F feedback
control to issue a Rich command. If the A/F sensor (sensor 1) voltage is high, the air/fuel ratio is rich, and the
ECM/PCM uses A/F feedback control to issue a Lean command.

If the element is not activated or the ECM/PCM terminal voltage is a set value or less for a set time when power
is applied to the A/F sensor (sensor 1) heater, a malfunction is detected and a DTC is stored.

Monitor Execution, Sequence, Duration, DTC Type, OBD Status

MONITOR DESCRIPTION

Execution

Continuous

Sequence

None

Duration

5 seconds or more

DTC Type

One drive cycle, MIL ON

OBD Status

PASSED/FAILED/NOT COMPLETED (STILL TESTING)

2007 Honda Element EX

2007 ENGINE PERFORMANCE Advanced Diagnostics - Element

Enable Conditions

ENABLE CONDITIONS

Malfunction Threshold

The AFS+ terminal voltage is 0.4 V or less for at least 5 seconds.

Driving Pattern

Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan
comes on, then let it idle for 2 minutes.

Diagnosis Details

Conditions for illuminating the MIL

When a malfunction is detected, the MIL comes on and the DTC and the freeze frame data are stored in the
ECM/PCM memory.

Conditions for clearing the MIL

The MIL will be cleared if the malfunction does not recur during three consecutive trips in which the diagnostic
runs.

The MIL, the DTC, and the freeze frame data can be cleared by using the scan tool Clear command or by
disconnecting the battery.

DTC P2252 (48): ADVANCED DIAGNOSTICS

DTC P2252: AIR/FUEL RATIO (A/F) SENSOR (SENSOR 1) AFS-CIRCUIT LOW VOLTAGE

Condition

Minimum

Maximum

Engine coolant temperature

68 °F (20 °C)

-

Battery voltage

10.5 V

-

State of the engine

Running

No active DTCs

P0117, P0118, P0134, P0135, P1157, P2195, P2252

2007 Honda Element EX

2007 ENGINE PERFORMANCE Advanced Diagnostics - Element

Fig. 238: Air/Fuel Ratio (A/F) Sensor 1 Circuit Diagram

General Description

The air/fuel ratio (A/F) sensor (sensor 1) is installed in the exhaust system and detects oxygen content in the
exhaust gas. The A/F sensor transmits a signal to the engine control module (ECM)/powertrain control module
(PCM). A heater for the sensor element is embedded in the A/F sensor (sensor 1). It heats the sensor to stabilize
and speed up the detection of oxygen content. The increase in current through the heater levels off as the
voltage applied to the electrode reaches a certain range because the amount of oxygen that goes through the
diffusion layer is limited. The current is proportional to oxygen content in the exhaust gas, so the air/fuel ratio is
detected by the measurement of the current. The ECM/PCM compares a set target air/fuel ratio with the
detected air/fuel ratio and controls the fuel injection duration.

If the A/F sensor (sensor 1) voltage is low, the air/fuel ratio is lean, and the ECM/PCM uses A/F feedback
control to issue a Rich command. If the A/F sensor (sensor 1) voltage is high, the air/fuel ratio is rich, and the
ECM/PCM uses A/F feedback control to issue a Lean command.

If the element is not activated or the ECM/PCM terminal voltage is a set value or less for a set time when power
is applied to the A/F sensor (sensor 1) heater, a malfunction is detected and a DTC is stored.

Monitor Execution, Sequence, Duration, DTC Type, OBD Status

MONITOR DESCRIPTION

Execution

Continuous

Sequence

None

Duration

5 seconds or more

DTC Type

One drive cycle, MIL ON

OBD Status

PASSED/FAILED/NOT COMPLETED (STILL TESTING)

2007 Honda Element EX

2007 ENGINE PERFORMANCE Advanced Diagnostics - Element