Acura RL. Instruction — page 101

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

MONITOR DESCRIPTION CHART

Enable Conditions

ENABLE CONDITIONS

Malfunction Threshold

The rear A/F sensor (bank 1, sensor 1) output voltage is 2.55 V or less, or 4.50 V or more.

Driving Pattern

Fig. 314: Driving Pattern

Execution

Once per driving cycle

Sequence

None

Duration

5.3 seconds or more

DTC Type

Two drive cycles, MIL ON

OBD Status

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

Condition

Minimum

Maximum

Elapsed time after starting the
engine

5 seconds

Engine coolant temperature

157°F (69°C)

Intake air temperature

15°F (-9°C)

Engine speed

2,400 rpm

Vehicle speed

30 mph (48 km/h)

Fuel feedback

During deceleration

No active DTCs

P0112, P0113, P0117, P0118, P0122, P0123, P0133, P0134,
P0135, P0171, P0172, P0222, P0223, P0300, P0301, P0302,
P0303, P0304, P0305, P0306, P0443, P0496, P0627, P1109,
P1172, P2101, P2108, P2118, P2122, P2123, P2127, P2128,
P2135, P2138, P2176, P2195, P2227, P2228, P2229, P2237,
P2238, P2243, P2245, P2251, P2252, P2627, P2628, U0107

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

me

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

Page 401 © 2005 Mitchell Repair Information Company, LLC.

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 speed between 25 — 55 mph (40 — 88 km/h) for at least 5 minutes.

3. Then, drive immediately at a steady speed between 55 — 75 mph (88 — 120 km/h) for at least 10

seconds.

4. Decelerate with the throttle valve fully closed for at least 6 seconds.

If the EVAP monitor runs instead of the HO2S monitor, turn the engine off, then restart it, and the
HO2S monitor will restart.

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 P2A03 (158): ADVANCED DIAGNOSTICS (V6 ENGINE A/T)

DTC P2A03: FRONT AIR/FUEL RATIO (A/F) SENSOR (BANK 2, SENSOR 1) CIRCUIT
RANGE/PERFORMANCE PROBLEM

Fig. 315: Front Air/Fuel Ratio Graph

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

me

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

Page 402 © 2005 Mitchell Repair Information Company, LLC.

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 the fuel feedback control to improve exhaust emissions. The PCM monitors the
front A/F sensor output voltage during deceleration with the throttle fully closed, and if the output voltage
deviates greatly from normal oxygen concentration levels, it detects a malfunction and stores a DTC.

* Output to the scan tool exhibits a relationship between the front A/F sensor output and oxygen
concentration, which is opposite to the characteristic shown in the graph. That is, a deviation toward the rich
side increases the output voltage and one toward the lean side decreases the output voltage as the
stoichiometric ratio is 0.

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

MONITOR DESCRIPTION CHART

Enable Conditions

ENABLE CONDITIONS

Malfunction Threshold

The front A/F sensor (bank 2, sensor 1) output voltage is 2.55 V or less, or 4.50 V or more.

Driving Pattern

Execution

Once per driving cycle

Sequence

None

Duration

5.3 seconds or more

DTC Type

Two drive cycles, MIL ON

OBD Status

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

Condition

Minimum

Maximum

Elapsed time after starting the
engine

5 seconds

Engine coolant temperature

157°F (69°C)

Intake air temperature

15°F (-9°C)

Engine speed

2,400 rpm

Vehicle speed

30 mph (48 km/h)

Fuel feedback

During deceleration

No active DTCs

P0112, P0113, P0117, P0118, P0122, P0123, P0153, P0154,
P0155, P0174, P0175, P0222, P0223, P0300, P0301, P0302,
P0303, P0304, P0305, P0306, P0443, P0496, P0627, P1109,
P1174, P2101, P2108, P2118, P2122, P2123, P2127, P2128,
P2135, P2138, P2176, P2197, P2227, P2228, P2229, P2240,
P2241, P2247, P2249, P2254, P2255, P2630, P2631, U0107

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

me

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

Page 403 © 2005 Mitchell Repair Information Company, LLC.

Fig. 316: 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 speed between 25 — 55 mph (40 — 88 km/h) for at least 5 minutes.

3. Then, drive immediately at a steady speed between 55 — 75 mph (88 — 120 km/h) for at least 10

seconds.

4. Decelerate with the throttle valve fully closed for at least 6 seconds.

If the EVAP monitor runs instead of the HO2S monitor, turn the engine off, then restart it, and the
HO2S monitor will restart.

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 U0073 (126): ADVANCED DIAGNOSTICS (V6 ENGINE A/T)

DTC U0073: F-CAN MALFUNCTION (BUS-OFF)

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

me

Friday, June 05, 2009 2:32:09 PM

Page 404 © 2005 Mitchell Repair Information Company, LLC.

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