Acura RL. Instruction — page 44

Fig. 128: 5th Clutch And 5th Clutch Hydraulic Work Flow

Fig. 129: Gear Ratio VS Shift Status Graph

General Description

To engage 5th gear, line pressure is supplied to the 5th clutch piston, engaging the 5th clutch, and the input
shaft (mainshaft) and the input shaft (mainshaft) 5th gear are connected and revolve together. Hydraulic
pressure is supplied to the 5th clutch through the ATF strainer —> the ATF pump —> the regulator valve —>
the manual valve —> the shift valves —> the feed pipe —> 5th clutch piston. (A shift valve failure in the

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2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

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supply route above is detected by the malfunction detection of each shift solenoid valve.) The powertrain
control module (PCM) computes the ratio of the input shaft (mainshaft) speed to the output shaft
(countershaft) speed. When the ratio is not the 5th gear ratio, it is detected as a malfunction of the hydraulic
circuit or the 5th clutch, and a DTC is stored.

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

MONITOR DESCRIPTION CHART

Enable Conditions

ENABLE CONDITIONS

Malfunction Threshold

The actual gear ratio must match one of these conditions for at least 12 seconds with the 5th gear command.

Actual gear ratio is greater than the 5th gear ratio by a factor of 1.2.

Actual gear ratio is less than the 5th gear ratio by a factor of 0.75.

Driving Pattern

Start the engine, shift to the D position, and drive the vehicle at a speed of 8 mph (12 km/h) or more for at
least 12 seconds in 5th gear.

Drive the vehicle in this manner only if the traffic regulations and ambient conditions allow.

Diagnosis Details

Conditions for illuminating the MIL

Execution

Continuous

Sequence

None

Duration

12 seconds or more

DTC Type

Two drive cycles, MIL OFF, D indicator blinks

OBD Status

PASSED/FAILED/NOT COMPLETED (STILL TESTING)

Condition

Minimum

Maximum

Battery
voltage

11.0 V

Engine
speed

1,000 rpm

Vehicle
speed

8 mph (12 km/h)

Shift lever
position

D

No active
DTCs

P0116, P0117, P0118, P0122, P0123, P0705, P0706, P0716, P0717, P0718, P0721,
P0722, P0723, P0731, P0732, P0733, P0734, P0746, P0747, P0751, P0752, P0756,
P0757, P0761, P0762, P0776, P0777, P0796, P0797, P0962, P0963, P0966, P0967,
P0970, P0971, P0973, P0974, P0976, P0977, P0979, P0980, P0982, P0983, P1743,
P1744, P1745, P1780

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Page 174 © 2005 Mitchell Repair Information Company, LLC.

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 DTC and the freeze frame data
are stored. The MIL does not come on.

Conditions for clearing 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 P0741 (40): ADVANCED DIAGNOSTICS

DTC P0741: TORQUE CONVERTER CLUTCH HYDRAULIC CIRCUIT STUCK OFF

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Fig. 130: Torque Converter Clutch Hydraulic System Diagram

Fig. 131: Throttle Pedal Position Pattern

A/T CLUTCH PRESSURE CONTROL SOLENOID VALVE OPERATION CHART

General Description

The power transfer capacity of the torque converter clutch is controlled by the balance of automatic
transmission fluid (ATF) supply to and discharge from the torque converter. When hydraulic pressure is
applied internally, the torque converter clutch turns ON, and when hydraulic pressure is applied from the
back pressure side, the torque converter clutch turns OFF. As the hydraulic pressure from the internal
pressure side increases, the power transfer capacity of the torque converter clutch increases. The direction of
hydraulic pressure supply is switched by shift solenoid valve D and the lock-up shift valve. ATF is supplied
from the internal pressure side to shift solenoid valve D when the signal from the powertrain control module
(PCM) is ON (12 V), and ATF is supplied from the back pressure side when it is OFF (0 V). The balance of
internal pressure and back pressure is controlled by A/T clutch pressure control solenoid valve C, the lock-
up control valve, and the lock-up timing valve. A/T clutch pressure control solenoid valve C maximizes the
power transfer capacity of the torque converter clutch when the signal from the PCM is ON (1 A), and it
minimizes the power transfer capacity of the torque converter clutch when the signal from the PCM is OFF
(0 A). If the ratio of engine speed and input shaft (mainshaft) speed is not about 1:1 while the PCM is
issuing the command to turn shift solenoid valve D and A/T clutch pressure control solenoid valve C ON,
the PCM detects a faulty lock-up control system and stores a DTC.

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

MONITOR DESCRIPTION CHART

Torque converter clutch

operation

A/T clutch pressure control solenoid valve C

ON (100 %)

OFF (0 %)

Shift solenoid valve D

ON (12 V)

Torque converter clutch: maximum
duty

Torque converter clutch
OFF

OFF (0 V) Torque converter clutch OFF

Torque converter clutch
OFF

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

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Friday, June 05, 2009 2:32:04 PM

Page 176 © 2005 Mitchell Repair Information Company, LLC.

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