Acura RL. Instruction — page 94

Malfunction Threshold

The front secondary HO2S (bank 2, sensor 2) output voltage is 0.650 V or less.

Driving Pattern

1. Start the engine. Let it idle until the radiator fan comes on.

2. Drive the vehicle at a steady speed of 35 mph (57 km/h) or more for at least 31.3 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 P2273 (162): ADVANCED DIAGNOSTICS

DTC P2273: FRONT SECONDARY HEATED OXYGEN SENSOR (SECONDARY HO2S (BANK 2,
SENSOR 2)) CIRCUIT SIGNAL STUCK RICH

MAP value

34 kPa (9.9 in.Hg, 250 mmHg)

66 kPa (19.6 in.Hg, 500 mmHg)

Vehicle speed

30 mph (48 km/h)

Fuel trim

0.73

1.47

Fuel feedback

Closed loop

No active DTCs

P0107, P0108, P0111, P0112, P0113, P0117, P0118, P0153,
P0154, P0155, P0157, P0158, P0161, P0174, P0175, P0300,
P0301, P0302, P0303, P0304, P0305, P0306, P0335, P0339,
P0340, P0344, P0401, P0404, P0443, P0496, P0627, P1077,
P1078, P1128, P1129, P1174, P2197, P2240, P2241, P2247,
P2249, P2254, P2255, P2413, P2630, P2631, P2646, P2647,
P2648, P2649, P2A03

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

me

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

Page 373 © 2005 Mitchell Repair Information Company, LLC.

Fig. 297: Front Secondary Heated Oxygen Sensor Graph

General Description

The front secondary HO2S (bank 2, sensor 2) detects the oxygen concentration in the exhaust gas
downstream of the three-way catalyst (TWC). The front sensor output voltage characteristics are similar to
the air/fuel ratio (A/F) sensor. The oxygen concentration is detected after the TWC during fuel feedback
control using the A/F sensor, and it optimizes the fuel feedback control to maximize the effect of the TWC.
If, after current is applied to the front secondary HO2S heater, the front secondary HO2S does not fluctuate
and the output is stuck within the specified area, a malfunction 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

31.3 seconds or less

DTC Type

Two drive cycles, MIL ON

OBD Status

PASSED/FAILED/EXECUTING/OUT OF (TEST) CONDITION

Condition

Minimum

Maximum

Engine coolant temperature

156°F (69°C)

Intake air temperature

15°F (-9°C)

Engine speed

1,250 rpm

2,000 rpm

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

me

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

Page 374 © 2005 Mitchell Repair Information Company, LLC.

Malfunction Threshold

The front secondary HO2S (bank 2, sensor 2) output voltage is 0.293 V or more.

Driving Pattern

1. Start the engine. Let it idle until the radiator fan comes on.

2. Drive the vehicle at a steady speed of 35 mph (57 km/h) or more for at least 31.3 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 P2279 (109): ADVANCED DIAGNOSTICS

DTC P2279: INTAKE AIR SYSTEM LEAK

MAP value

34 kPa (9.9 in.Hg, 250 mmHg)

66 kPa (19.6 in.Hg, 500 mmHg)

Vehicle speed

30 mph (48 km/h)

Fuel trim

0.73

1.47

Fuel feedback

Closed loop

No active DTCs

P0107, P0108, P0111, P0112, P0113, P0117, P0118, P0153,
P0154, P0155, P0157, P0158, P0161, P0174, P0175, P0300,
P0301, P0302, P0303, P0304, P0305, P0306, P0335, P0339,
P0340, P0344, P0401, P0404, P0443, P0496, P0627, P1077,
P1078, P1128, P1129, P1174, P2197, P2240, P2241, P2247,
P2249, P2254, P2255, P2272, P2413, P2630, P2631, P2646,
P2647, P2648, P2649, P2A03

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

me

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

Page 375 © 2005 Mitchell Repair Information Company, LLC.

Fig. 298: Intake Air System Diagram

Fig. 299: Intake Air System Graph

General Description

The positive crankcase ventilation (PCV) system reduces hydrocarbons (HC). The PCV system recirculates
unburned air/fuel mixture (blow-by vapor) into the intake manifold so that it is drawn into the engine and
burned, thus reducing HC. If the PCV hose comes off while air is supplied mainly via the idle control
system with the throttle closed, the amount of air supplied to the engine is considerably more than the
amount of air the idle control system supplies.

The powertrain control module (PCM) estimates the amount of air supplied to the engine while the throttle
valve is fully closed, and if the estimated amount is more than the upper limit, it detects a malfunction and a
DTC is stored.

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

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

me

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

Page 376 © 2005 Mitchell Repair Information Company, LLC.

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