Acura RL. Instruction — page 46

DTC P0747: A/T CLUTCH PRESSURE CONTROL SOLENOID VALVE A STUCK ON

Fig. 135: A/T Clutch Pressure Control Solenoid Valve A — Operation Diagram

Fig. 136: Gear Position VS Shift Status Graph

Hydraulic pressure supply to the clutch by shift solenoid valve output (D position)

Fig. 137: Shift Solenoid Valve Output (D Position)

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

me

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

Page 181 © 2005 Mitchell Repair Information Company, LLC.

General Description

A/T clutch pressure control solenoid valve A is installed in the transmission housing. A/T clutch pressure
control solenoid valve A is operated by the powertrain control module (PCM) and converts the modulated
pressure to A/T clutch pressure control solenoid A pressure, which operates CPC valve A. Line pressure is
modulated to clutch pressure control A pressure (CPC A pressure) by CPC valve A and the CPC valve A
spring. A signal from the PCM is output to the proper gear clutch, determined by the gear schedule, to
supply the proper CPC pressure according to the driving conditions. When the current from the PCM is high
(ON), A/T clutch pressure control solenoid valve A operates and the CPC valve A pressure increases. When
the current from the PCM is low (OFF), A/T clutch pressure control solenoid valve A turns off and CPC
valve A pressure decreases. The PCM monitors the input shaft (mainshaft) speed and the output shaft
(countershaft) speed at the gear change determined by the shift schedule. When an improper gear ratio is
output compared to the predetermined gear ratio, an A/T clutch pressure control solenoid valve A ON
failure is detected and a DTC is stored.

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

MONITOR DESCRIPTION CHART

Enable Conditions

ENABLE CONDITIONS

Malfunction Threshold

One of these conditions occurs.

The transmission is held in 2nd gear against the 2nd —> 3rd gear upshift command though there is no
record of being neutral when the 1st gear shift is commanded.

The transmission is held in 4th gear against the 4th —> 5th gear upshift command though there is no
record of being neutral when the 1st gear shift is commanded.

Execution

Continuous

Sequence

None

Duration

20 seconds or less

DTC Type

Two drive cycles, MIL ON, D indicator blinks

OBD Status

PASSED/FAILED/NOT COMPLETED (STILL TESTING)

Condition

Minimum

Maximum

Battery voltage

11.0 V

Engine coolant temperature

50°F (10°C)

ATF temperature

-4°F (-20°C)

Vehicle speed

5 mph (9 km/h)

Shift lever position

D

No active DTCs

P0122, P0123, P0705, P0716, P0717, P0718, P0721, P0722,
P0723, P0746, P0751, P0752, P0756, P0757, P0761, P0762,
P0766, P0767, P0776, P0777, P0796, P0797, P0842, P0843,
P0847, P0848, P0962, P0963, P0966, P0967, P0970, P0971,
P0973, P0974, P0976, P0977, P0979, P0980, P0982, P0983,
P1743, P1744, P1745, P1780

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

me

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

Page 182 © 2005 Mitchell Repair Information Company, LLC.

Driving Pattern

Start the engine, and accelerate the vehicle until the transmission shifts into 5th gear 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 P0751 (70): ADVANCED DIAGNOSTICS

DTC P0751: SHIFT SOLENOID VALVE A STUCK OFF

Fig. 138: Shift Solenoid Valve A — Operation Diagram

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

me

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

Page 183 © 2005 Mitchell Repair Information Company, LLC.

Fig. 139: Gear Position VS Shift Status Graph

Fig. 140: Shift Solenoid Valve Driving Signal Combination Table

General Description

Shift solenoid valve A is installed in the transmission housing. It is controlled by the ON/OFF signal from
the powertrain control module (PCM) to apply line pressure to shift valve A. The signal from the PCM is
output to apply clutch pressure control pressure to the proper gear change clutch according to the gear
change schedule. When the signal to shift solenoid valve A from the PCM is ON, and line pressure is
applied to shift valve A, it operates against the shift valve A spring. When the signal to shift solenoid valve
A from the PCM is OFF, and line pressure is discharged, shift valve A is inactive. The PCM monitors the
input shaft (mainshaft) speed and the output shaft (countershaft) speed at the gear change determined by the
shift schedule. When an improper gear ratio is output compared to the predetermined gear change mode, a
shift solenoid valve A OFF failure is detected and a DTC is stored.

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

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

me

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

Page 184 © 2005 Mitchell Repair Information Company, LLC.

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