Acura RL. Instruction — page 6

Fig. 18: Cooling System — Operation Diagram

General Description

The thermostat is closed when the engine coolant temperature is low, and it stops the circulation of engine
coolant to speed engine warm up. When the engine coolant temperature increases, the thermostat opens and
circulates engine coolant to control its temperature. When the engine coolant temperature decreases, the
opening area of the thermostat is reduced to regulate the engine coolant temperature. If the thermostat sticks
open, engine warm up is delayed, and exhaust emissions are adversely affected. The powertrain control
module (PCM) measures the rise in the coolant temperature after the engine starts using engine coolant
temperature (ECT) sensors 1/2, and it estimates the characteristics of the engine coolant temperature by
calculations based on those two temperatures and the driving conditions. When ECT 2 immediately
increases from the starting value, it is defined as the thermostat stuck open. When ECT 2 does not increase
to the specified value, it is defined as a thermostat malfunction.

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

MONITOR DESCRIPTION CHART

Execution

Once per driving cycle

Sequence

None

Duration

Depending on driving conditions

DTC Type

Two drive cycles, MIL ON

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

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© 2005 Mitchell Repair Information Company, LLC.

Enable Conditions

ENABLE CONDITIONS

Malfunction Threshold

Malfunction determination 1:

If the difference between the current measured coolant temperature at the radiator (ECT 2) and the initial
coolant temperature at the radiator (ECT 2) is at least 51°F (11°C) when the estimated coolant temperature
at the engine (ECT 1) reaches 164°F (74°C), a malfunction is detected (thermostat stuck open); or if the
coolant temperature at the radiator (ECT 2) only reaches 68°F (20°C), a malfunction is detected (thermostat
malfunction).

Malfunction determination 2:

When the estimated engine coolant temperature (ECT 1) reaches 158°F (70°C) before the measured engine
coolant temperature (ECT 1) reaches 158°F (70°C), a malfunction is detected.

Driving Pattern

OBD Status

PASSED/FAILED/NOT COMPLETED (STILL TESTING)

Condition

Minimum

Maximum

Elapsed time before starting the
engine

6 hours

Initial engine coolant temperature
(ECT 1)

20°F (-6°C)

123°F (50°C)

Initial engine coolant temperature
(ECT 2)

20°F (-6°C)

Initial intake air temperature

20°F (-6°C)

The difference between initial
intake air temperature and current
intake air temperature

1°F (1°C)

(1)

3°F (2°C)

(2)

No active DTCs

P0107, P0108, P0111, P0112, P0113, P0116, P0117, P0118,
P0122, P0123, P0125, P0134, P0135, P0154, P0155, P0171,
P0172, P0174, P0175, P0222, P0223, P0300, P0301, P0302,
P0303, P0304, P0305, P0306, P0335, P0339, P0340, P0344,
P0401, P0404, P0443, P0496, P0506, P0507, P0627, P1077,
P1078, P1109, P1116, P1128, P1129, P1172, P1174, P2101,
P2108, P2118, P2122, P2123, P2127, P2128, P2135, P2138,
P2176, P2183, P2184, P2185, P2195, P2197, P2227, P2228,
P2229, P2237, P2238, P2240, P2241, P2243, P2245, P2247,
P2249, P2251, P2252, P2254, P2255, P2413, P2610, P2627,
P2628, P2630, P2631, P2646, P2647, P2648, P2649, U0107

(1)

Intake air temperature decrease judgement when there is no driving record 25 mph (40 km/h) in
this drive cycle.

(2)

Intake air temperature decrease judgement when there is a driving record 25 mph (40 km/h) in
this drive cycle.

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

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

Page 22

© 2005 Mitchell Repair Information Company, LLC.

1. Start the engine under the conditions specified under Enable Conditions.

2. Drive the vehicle at a speed between 15 — 75 mph (24 — 120 km/h) for at least 10 minutes.

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 with the ECT and IAT at engine start-up within
the specified temperature range, a Temporary DTC is stored in the PCM memory. If the malfunction recurs
during the next (second) drive cycle with the ECT and IAT at engine start-up within the specified
temperature range, 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 P0133 (157): ADVANCED DIAGNOSTICS

DTC P0133: REAR AIR/FUEL RATIO (A/F) SENSOR (BANK 1, SENSOR 1) CIRCUIT SLOW
RESPONSE

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

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

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© 2005 Mitchell Repair Information Company, LLC.

Fig. 19: Rear Air/Fuel Ratio Sensor (Bank 1, Sensor 1) Signal Output

General Description

The rear air/fuel ratio (A/F) sensor (bank 1, sensor 1) has a linear signal output in relation to the oxygen
concentration. The powertrain control module (PCM) computes the air/fuel ratio from rear A/F sensor
output voltage and uses fuel feedback control to improve exhaust emissions. The PCM measures the
response characteristics against the rear A/F sensor output, and if the average inversion cycle 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

Malfunction Threshold

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

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

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,
P0134, P0135, P0171, P0172, P0300, P0301,
P0302, P0303, P0304, P0305, P0306, P0335,
P0339, P0340, P0344, P0401, P0404, P0443,
P0496, P0627, P1077, P1078, P1109, P1128,
P1129, P1172, P2195, P2227, P2228, P2229,
P2237, P2238, P2243, P2245, P2251, P2252,
P2413, P2627, P2628, P2646, P2647, P2648,
P2649, P2A00

Other

Without excessive load change

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

me

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

Page 24

© 2005 Mitchell Repair Information Company, LLC.

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