Acura RL. Instruction — page 68

Fig. 225: Engine Coolant Temperature Sensor 1 Performance Graph

General Description

Two engine coolant temperature sensors and one intake air temperature sensor are used by the powertrain
control module (PCM).

When the engine is stopped and enough time has passed, the temperature of the engine will equal the
ambient temperature.

When an inappropriate temperature is detected after comparing the temperature readings of each sensor, a
malfunction in the corresponding sensor 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

10 seconds or more

DTC Type

Two drive cycles, MIL ON

OBD Status

N/A

Condition

Minimum

Maximum

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

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Malfunction Threshold

A malfunction is detected if these three conditions are not present after the engine and the ignition switch
have been off for at least 6 hours before restarting the engine.

The temperature (IAT minus ECT1) is not 57°F (32°C) or less.

The temperature (IAT minus ECT2) is not 28°F (16°C) or less.

The temperature (ECT2 minus ECT1) is not 45°F (25°C) or less.

Driving Pattern

1. Turn the ignition off, and wait at least 6 hours.

2. Start the engine, and let it idle for at least 10 seconds.

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 P1128 (5): ADVANCED DIAGNOSTICS

DTC P1128: MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR SIGNAL LOWER THAN
EXPECTED

Engine off time 6 hours

No active DTCs P0111, P0112, P0113, P0116, P0117, P0118, P0125, P2183, P2184, P2185, P2610

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

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

Page 270 © 2005 Mitchell Repair Information Company, LLC.

Fig. 226: Manifold Absolute Pressure Sensor Output Voltage Graph

Fig. 227: Manifold Absolute Pressure Sensor Normal Operation And System Failure Diagram

General Description

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 (idling) 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 lower voltage than expected, the PCM detects a malfunction and stores a DTC.

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

MONITOR DESCRIPTION CHART

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

me

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

Page 271 © 2005 Mitchell Repair Information Company, LLC.

Enable Conditions

ENABLE CONDITIONS

Malfunction Threshold

The MAP sensor output is 36 kPa (10.9 in.Hg, 277 mmHg) or less for at least 2 seconds when
atmospheric pressure is 61 kPa (18.1 in.Hg, 460 mmHg).

The MAP sensor output is 53 kPa (15.9 in.Hg, 405 mmHg) or less for at least 2 seconds when
atmospheric pressure is 103 kPa (30.5 in.Hg, 776 mmHg).

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 of 15 mph (24 km/h) or more with a 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

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)

Throttle position

1,000 rpm

12.4 °

3,000 rpm

27.0 °

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, P1109, P1129, P2101, P2108,
P2118, P2122, P2123, P2127, P2128, P2135,
P2138, P2176, P2227, P2228, P2229, P2279,
P2413, P2646, P2647, P2648, P2649, U0107

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

me

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

Page 272 © 2005 Mitchell Repair Information Company, LLC.

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