Acura RL. Instruction — page 85

Fig. 273: A/F Sensor Misinstalled Malfunction With Malfunction Diagnosis

General Description

When the front air/fuel ratio (A/F) sensor (bank 2, sensor 1) is properly connected to the engine wire
harness, but it is not installed in the exhaust pipe, the A/F feedback is not performed properly even if the
front A/F sensor is active after starting the engine. Thus, the exhaust emissions increase.

When the front A/F sensor output stays out of the normal range after the front A/F sensor becomes active,
the powertrain control module (PCM) detects that the front A/F sensor is not properly installed and a DTC is
stored.

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

MONITOR DESCRIPTION CHART

Enable Conditions

ENABLE CONDITIONS

Execution

Once per driving cycle

Sequence

None

Duration

7 seconds or more

DTC Type

One drive cycle, MIL ON

OBD Status

PASSED/FAILED/NOT COMPLETED (STILL TESTING)

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

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

Page 337 © 2005 Mitchell Repair Information Company, LLC.

Malfunction Threshold

The front A/F sensor (bank 2, sensor 1) output voltage is 3.48 V or more for at least 7 seconds.

Driving Pattern

Start the engine, then let it idle for at least 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 P2227 (13): ADVANCED DIAGNOSTICS

DTC P2227: BAROMETRIC PRESSURE (BARO) SENSOR RANGE/PERFORMANCE PROBLEM

Fig. 274: Barometric Pressure (BARO) Sensor Output Voltage Graph

Condition

Fuel
feedback

Other than during fuel cut-off operation

No active
DTCs

P0154, P0155, P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0627, P1174,
P2240, P2241, P2247, P2249, P2254, P2255, P2630, P2631

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

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Page 338 © 2005 Mitchell Repair Information Company, LLC.

Fig. 275: Barometric Pressure (BARO) Sensor Normal Operation And System Failure Diagram

General Description

The barometric pressure (BARO) sensor is built into the powertrain control module (PCM) and monitors
atmospheric pressure. When the throttle valve is wide open, the manifold absolute pressure (MAP) sensor
output is nearly equal to the BARO sensor output. Making use of this characteristic, a malfunction can be
detected in the BARO sensor output.

If the throttle position is beyond a value stored in the PCM that is used to detect «wide-open throttle,» and if
the difference between the MAP sensor output and the BARO sensor output is equal to or greater than a set
value, a malfunction in the BARO sensor output is detected and a DTC is stored.

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

MONITOR DESCRIPTION CHART

Enable Conditions

ENABLE CONDITIONS

Execution

Once per driving cycle

Sequence

None

Duration

2 seconds or more

DTC Type

Two drive cycles, MIL ON

OBD Status

PASSED/FAILED/NOT COMPLETED (STILL TESTING)

Condition

Minimum

Maximum

Elapsed time
after cylinder
pausing

4 seconds

Throttle
position

1,000
rpm

14.0 °

3,000
rpm

30.0 °

P0107, P0108, P0117, P0118, P0122, P0123, P0171, P0172, P0174, P0175, P0222,

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

me

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

Page 339 © 2005 Mitchell Repair Information Company, LLC.

Malfunction Threshold

The difference between the BARO sensor output and the MAP sensor output is 26 kPa (7.5 in.Hg, 190
mmHg) or more for at least 2 seconds.

Driving Pattern

1. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the

radiator fan comes on.

2. Drive the vehicle with the throttle position as specified under Enable Conditions for at least 2 seconds.

Drive the vehicle in this manner only if the traffic regulations and ambient conditions allow.

Diagnosis Details

Conditions for illuminating the MIL

When a malfunction is detected during the first drive cycle, a Temporary DTC is stored in the PCM
memory. If the malfunction recurs during the next (second) drive cycle, the MIL comes on and the DTC and
the freeze frame data are stored.

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

DTC P2228 (13): ADVANCED DIAGNOSTICS

DTC P2228: BAROMETRIC PRESSURE (BARO) SENSOR CIRCUIT LOW VOLTAGE

No active DTCs

P0223, P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0401, P0404, P0506,
P0507, P0627, P1077, P1078, P1109, P1128, P1129, P2101, P2108, P2118, P2122,
P2123, P2127, P2128, P2135, P2138, P2176, P2228, P2229, P2279, P2413, P2646,
P2647, P2648, P2649, U0107

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

me

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

Page 340 © 2005 Mitchell Repair Information Company, LLC.

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