Acura RL. Instruction — page 41

ENABLE CONDITIONS

Malfunction Threshold

The fluctuation of the vehicle speed measured by the output shaft (countershaft) speed sensor in 10
milliseconds is 4 mph (6km/h) or more, and it fluctuates at least six times within 500 milliseconds.

Driving Pattern

Start the engine, and drive the vehicle at a speed of 13 mph (20 km/h) or more so it shifts from 1st to 5th in
the D position.

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 P0731 (64): ADVANCED DIAGNOSTICS

DTC P0731: PROBLEM IN 1ST CLUTCH AND 1ST CLUTCH HYDRAULIC CIRCUIT

Condition

Minimum

Maximum

Vehicle speed

13 mph (20 km/h)

Battery voltage

11.0 V

No active DTCs P0721, P0722

Others

Not during shifting
Not when an input shaft (mainshaft) speed sensor intermittent failure is detected

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

me

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

Page 161 © 2005 Mitchell Repair Information Company, LLC.

Fig. 119: 1st Clutch And 1st Clutch Hydraulic Circuit Diagram Work Flow

SYMPTOM 1

Fig. 120: Gear Ratio VS Shift Status Graph

SYMPTOM 2

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

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

Page 162 © 2005 Mitchell Repair Information Company, LLC.

Fig. 121: Gear Ratio VS Shift Status Graph

General Description

To engage 1st gear, line pressure is supplied to the 1st clutch piston, engaging the 1st clutch, and the
secondary shaft and the secondary shaft 1st gear are connected and revolve together. Hydraulic pressure is
supplied to the 1st clutch through the ATF strainer —> the ATF pump —> the regulator valve —> the manual
valve —> the shift valves —> the feed pipe —> 1st clutch piston. (A shift valve failure in the 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 1st gear ratio, it is detected as a malfunction of the hydraulic circuit or the 1st
clutch, 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

12 seconds or more (Symptom 1)
Depending on the driving pattern (Symptom 2)

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

(1)

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

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

Page 163 © 2005 Mitchell Repair Information Company, LLC.

Malfunction Threshold

One of these symptoms occurs.

Symptom 1

The actual gear ratio must match one of these conditions for at least 12 seconds with the 1st gear command.

Actual gear ratio is greater than the 1st gear ratio by a factor of 1.2.

Actual gear ratio is less than the 1st gear ratio by a factor of 0.75.

Symptom 2

The actual gear position is neutral for at least 3 seconds, and then the transmission up-shifted from 2nd to
3rd, even though 1st gear shift is commanded.

Driving Pattern

Symptom 1

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 1st gear.

Symptom 2 (When the vehicle does not start at 1st gear)

1. Start the engine.

2. Shift to the D position, and press the accelerator pedal about 3% for at least 5 seconds.

3. Release the accelerator pedal until the engine speed drops 1,000 rpm or less.

4. Drive the vehicle so that the transmission shifts from 2nd to 3rd gear.

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

Vehicle
speed

8 mph (12 km/h)

(1)

Throttle
position

10 %

(1)

Shift lever
position

D

(1)

D, D3

(2)

State of the
engine

Running

(2)

No active
DTCs

P0116, P0117, P0118, P0122, P0123, P0705, P0706, P0716, P0717, P0718, P0721,
P0722, P0723, P0732, P0733, P0734, P0735, 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

(1)

Symptom 1

(2)

Symptom 2

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

me

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

Page 164 © 2005 Mitchell Repair Information Company, LLC.

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