Acura RL. Instruction — page 87

Malfunction Threshold

The IPB1 terminal voltage is 2.0 V or less, or 5.6 V or more, for at least 15 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
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 (155): ADVANCED DIAGNOSTICS

DTC P2238: REAR AIR/FUEL RATIO (A/F) SENSOR (BANK 1, SENSOR 1) IP CIRCUIT LOW
VOLTAGE

No active DTCs

P0135, P2195, P2238, P2243, P2245, P2251, P2252, P2627, P2628

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

me

Friday, June 05, 2009 2:32:07 PM

Page 345 © 2005 Mitchell Repair Information Company, LLC.

Fig. 281: Rear Air/Fuel Ratio Sensor (Bank 1, Sensor 1) — Circuit Diagram

General Description

The rear air/fuel ratio (A/F) sensor (bank 1, sensor 1) is installed in the exhaust manifold and detects oxygen
content in the exhaust gas. The rear A/F sensor transmits a signal to the powertrain control module (PCM).
The PCM controls fuel injection duration by comparing the target air/fuel ratio with the rear A/F sensor
signal. The sensor includes the VS cell, the pump cell, the atmospheric reference cavity, the diffusion layer,
and the heater, and it enables overall feedback control.

If the IPB1 terminal voltage is a specified value or less, the PCM detects a malfunction and stores a DTC.

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

MONITOR DESCRIPTION CHART

Enable Conditions

ENABLE CONDITIONS

Execution

Continuous

Sequence

None

Duration

5 seconds or more

(1)

, 85 seconds or more

(2)

DTC Type

One drive cycle, MIL ON

OBD Status

PASSED/FAILED/NOT COMPLETED (STILL TESTING)

(1)

After the sensor becomes active

(2)

Before the sensor becomes active

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

me

Friday, June 05, 2009 2:32:07 PM

Page 346 © 2005 Mitchell Repair Information Company, LLC.

Malfunction Threshold

The IPB1 input terminal voltage is 1.0 V or less for at least 5 seconds*, 85 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
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 P2240 (156): ADVANCED DIAGNOSTICS

DTC P2240: FRONT AIR/FUEL RATIO (A/F) SENSOR (BANK 2, SENSOR 1) IP CIRCUIT HIGH
VOLTAGE

Condition

State of the engine

Running

No active DTCs

P0135, P2195, P2237, P2243, P2245, P2251, P2252, P2627, P2628

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

me

Friday, June 05, 2009 2:32:07 PM

Page 347 © 2005 Mitchell Repair Information Company, LLC.

Fig. 282: Front Air/Fuel Ratio Sensor (Bank 2, Sensor 1) — Circuit Diagram

General Description

The front air/fuel ratio (A/F) sensor (bank 2, sensor 1) is installed in the exhaust manifold and detects
oxygen content in the exhaust gas. The front A/F sensor transmits a signal to the powertrain control module
(PCM). The PCM controls fuel injection duration by comparing the target air/fuel ratio with the front A/F
sensor signal. The sensor includes the VS cell, the pump cell, the atmospheric reference cavity, the diffusion
layer, and the heater, and it enables overall feedback control.

If the IPB2 terminal voltage is out of a specified range, the PCM detects a malfunction and stores a DTC.

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

MONITOR DESCRIPTION CHART

Enable Conditions

ENABLE CONDITIONS

Execution

Continuous

Sequence

None

Duration

15 seconds or more

DTC Type

One drive cycle, MIL ON

OBD Status

PASSED/FAILED/NOT COMPLETED (STILL TESTING)

Condition

Minimum

Maximum

VSB2 terminal voltage

3.4 V

4.8 V

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

me

Friday, June 05, 2009 2:32:07 PM

Page 348 © 2005 Mitchell Repair Information Company, LLC.

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