Acura RL. Instruction — page 69

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 P1129 (5): ADVANCED DIAGNOSTICS

DTC P1129: MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR SIGNAL HIGHER THAN
EXPECTED

Fig. 228: Manifold Absolute Pressure Sensor Output Voltage Graph

Fig. 229: Manifold Absolute Pressure Sensor Normal Operation And System Failure Diagram

General Description

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

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Page 273 © 2005 Mitchell Repair Information Company, LLC.

The manifold absolute pressure (MAP) sensor senses manifold absolute pressure (vacuum) and converts it
into electrical signals. The MAP sensor outputs low signal voltage at high-vacuum (throttle valve closed)
and high signal voltage at low-vacuum (throttle valve wide open).

The powertrain control module (PCM) compares a predetermined MAP value at a given throttle position
and manifold absolute pressure to the output voltage value of the MAP sensor.

If the MAP sensor outputs high voltage during fuel cut-off operation for deceleration with the throttle valve
fully closed, which should make the manifold absolute pressure lower, the PCM detects a malfunction and
stores a DTC.

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

MONITOR DESCRIPTION CHART

Enable Conditions

ENABLE CONDITIONS

Malfunction Threshold

The MAP sensor output is 36 kPa (10.9 in.Hg, 277 mmHg) or more for at least 2 seconds.

Driving Pattern

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

Engine coolant temperature

156°F (69°C)

Engine speed

1,100 rpm

5,900 rpm

Vehicle speed

15 mph (24 km/h)

Fuel feedback

During deceleration

Throttle position

Fully closed

No active DTCs

P0107, P0108, P0117, P0118, P0122, P0123, P0171, P0172,
P0174, P0175, P0222, P0223, P0300, P0301, P0302, P0303,
P0304, P0305, P0306, P0401, P0404, P0506, P0507, P0627,
P1077, P1078, P1128, P2101, P2108, P2118, P2122, P2123,
P2127, P2128, P2135, P2138, P2176, P2413, P2646, P2647,
P2648, P2649, U0107

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

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Page 274 © 2005 Mitchell Repair Information Company, LLC.

Fig. 230: 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 between 55 — 75 mph (88 — 120 km/h) for at least 10 seconds.

3. Then, decelerate with the throttle valve fully closed 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 P1172 (157): ADVANCED DIAGNOSTICS

DTC P1172: REAR AIR/FUEL RATIO (A/F) SENSOR (BANK 1, SENSOR 1) CIRCUIT OUT OF
RANGE HIGH

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

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Friday, June 05, 2009 2:32:06 PM

Page 275 © 2005 Mitchell Repair Information Company, LLC.

Fig. 231: Rear Air/Fuel Ratio (A/F) Sensor (Bank 1, Sensor 1) Output Voltage Graph

General Description

If a malfunction causes the rear air/fuel sensor (bank 1, sensor 1) signal to the powertrain control module
(PCM) to deviate from the normal control area, the rear air/fuel ratio (A/F) sensor becomes active after the
engine starts, but the air/fuel feed-back does not start normally and the emissions deteriorate. When the rear
A/F sensor output is out of the normal area, and this condition continues after the rear A/F sensor is active,
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

7 seconds or more

DTC Type

One drive cycle, MIL ON

OBD Status

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

Condition

No active

P0107, P0108, P0117, P0118, P0134, P0135, P0171, P0172, P0300, P0301, P0302,

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

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Friday, June 05, 2009 2:32:06 PM

Page 276 © 2005 Mitchell Repair Information Company, LLC.

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