Acura RL. Instruction — page 98

Malfunction Threshold

The VLBLB1 voltage is 4.7 V or more for at least 5 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
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 P2630 (156): ADVANCED DIAGNOSTICS

DTC P2630: FRONT AIR/FUEL RATIO (A/F) SENSOR (BANK 2, SENSOR 1) LABEL CIRCUIT
LOW VOLTAGE

Condition

Ignition switch

ON

No active DTCs

P0135, P2195, P2237, P2238, P2243, P2245, P2251, P2252, P2627

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

me

Friday, June 05, 2009 2:32:08 PM

Page 389 © 2005 Mitchell Repair Information Company, LLC.

Fig. 307: Front Air/Fuel Ratio (A/F) Sensor (Bank 2, Sensor 1) LABEL Circuit Diagram (Low
Voltage)

General Description

The front 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 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.

The front A/F sensor (bank 1, sensor 1) has a built-in LABEL resistance to regulate the differences of the
sensor characteristics. The PCM reads the resistance to regulate the difference properly. If the LABEL
resistance (VLBLB2 signal voltage) is a set 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

DTC Type

One drive cycle, MIL ON

OBD Status

N/A

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

me

Friday, June 05, 2009 2:32:08 PM

Page 390 © 2005 Mitchell Repair Information Company, LLC.

Malfunction Threshold

The VLBLB 2 voltage is 0.3 V or less for at least 5 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
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 P2631 (156): ADVANCED DIAGNOSTICS (V6 ENGINE A/T)

DTC P2631: FRONT AIR/FUEL RATIO (A/F) SENSOR (BANK 2, SENSOR 1) LABEL CIRCUIT
HIGH VOLTAGE

Condition

Ignition switch

ON

No active DTCs

P0155, P2197, P2240, P2241, P2247, P2249, P2254, P2255, P2631

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

me

Friday, June 05, 2009 2:32:08 PM

Page 391 © 2005 Mitchell Repair Information Company, LLC.

Fig. 308: Front Air/Fuel Ratio (A/F) Sensor (Bank 2, Sensor 1) LABEL Circuit Diagram (High
Voltage)

General Description

The front 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 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.

The front A/F sensor (bank 1, sensor 1) has a built-in LABEL resistance to regulate the differences of the
sensor characteristics. The PCM reads the resistance to regulate the difference properly. If the LABEL
resistance (VLBLB2 signal voltage) is a set value or more, the PCM detects a malfunction and stores a
DTC.

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

MONITOR DESCRIPTION CHART

Enable Conditions

Execution

Continuous

Sequence

None

Duration

5 seconds or more

DTC Type

One drive cycle, MIL ON

OBD Status

N/A

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

me

Friday, June 05, 2009 2:32:08 PM

Page 392 © 2005 Mitchell Repair Information Company, LLC.

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