Acura RL. Manual - part 10

Fig. 29: Rear Secondary Heated Oxygen Sensor (Secondary HO2S) (Bank 1, Sensor 2) Heater -
Circuit Diagram

General Description

A heater for the zirconia element is embedded in the rear secondary heated oxygen sensor (rear secondary
HO2S) (bank 1, sensor 2), and it is controlled by the powertrain control module (PCM). When activated, it
heats the sensor to stabilize and speed up the detection of oxygen content when the exhaust gas temperature
is cold.

If the rear secondary HO2S heater draws more or less than a specified amperage, the PCM detects a
malfunction and a DTC is stored.

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

PASSED/FAILED/NOT COMPLETED (STILL TESTING)

Condition

Minimum

Maximum

Battery voltage
(IGP terminal of PCM)

10.5 V

16 V

State of the engine

Running

No active DTCs

P0117, P0118

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics - RL

Friday, June 05, 2009 2:32:03 PM

Page 37

Malfunction Threshold

The rear secondary HO2S heater output is 0.38 A or less, or 3.33 A or more, for at least 5 seconds when the
heater is on.

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.

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 P0153 (158): ADVANCED DIAGNOSTICS

DTC P0153: FRONT AIR/FUEL RATIO (A/F) SENSOR (BANK 2, SENSOR 1) CIRCUIT SLOW
RESPONSE

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics - RL

Friday, June 05, 2009 2:32:03 PM

Page 38

Fig. 30: Front Air/Fuel Ratio Sensor (Bank 2, Sensor 1) Signal Output

General Description

The front air/fuel ratio (A/F) sensor (bank 2, sensor 1) has a linear signal output in relation to the oxygen
concentration. The powertrain control module (PCM) computes the air/fuel ratio from the front A/F sensor
output voltage and uses fuel feedback control to improve exhaust emissions. The PCM measures the
response characteristics against the front A/F sensor output, and if the accumulated value within the
specified time is less than the specified value, it detects a deteriorated response and stores a DTC.

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

MONITOR DESCRIPTION CHART

Enable Conditions

ENABLE CONDITIONS

Execution

Once per driving cycle

Sequence

None

Duration

6.8 seconds or more

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

2,200 rpm

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics - RL

Friday, June 05, 2009 2:32:03 PM

Page 39

Malfunction Threshold

The average of the front A/F sensor (bank 2, sensor 1) inversion cycle 11 periods or less is at least 6.8
seconds.

Driving Pattern

Fig. 31: Vehicle Speed 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 at a steady speed up to 25 mph (40 km/h), for at least 5 minutes.

3. Then, drive immediately at a steady speed between 26 - 81 mph (41 - 130 km/h) for at least 6.8

seconds.

MAP value

1,250 rpm

47 kPa (13.8 in.Hg, 350
mmHg)

69 kPa (20.4 in.Hg, 520
mmHg)

2,000 rpm

27 kPa (7.9 in.Hg, 200
mmHg)

Vehicle speed

33 mph (52 km/h)

Fuel trim

0.73

1.47

Fuel feedback

Closed loop at stoichiometric

Monitoring priority

P0456, P0457, P0497

No active DTCs

P0107, P0108, P0112, P0113, P0117, P0118,
P0154, P0155, P0174, P0175, P0300, P0301,
P0302, P0303, P0304, P0305, P0306, P0335,
P0339, P0340, P0344, P0401, P0404, P0443,
P0496, P0627, P1077, P1078, P1109, P1128,
P1129, P1174, P2197, P2227, P2228, P2229,
P2240, P2241, P2247, P2249, P2254, P2255,
P2413, P2630, P2631, P2646, P2647, P2648,
P2649, P2A03

Other

Without excessive load change

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics - RL

Friday, June 05, 2009 2:32:03 PM

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