Acura RL. Instruction — page 54

Fig. 169: A/T Clutch Pressure Control Solenoid Valve C — Operation Diagram

Fig. 170: Gear Position Vs Shift Status Graph

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

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

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

Page 213 © 2005 Mitchell Repair Information Company, LLC.

Fig. 171: Shift Solenoid Valve Output (D Position)

General Description

A/T clutch pressure control solenoid valve C is installed in the transmission housing. A/T clutch pressure
control solenoid 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 C operates and the CPC valve A pressure increases. When
the current from the PCM is low (OFF), A/T clutch pressure control solenoid valve C turns off and CPC
valve A pressure decreases. The PCM monitors the transmission fluid pressure switch at the gear change
determined by the shift schedule. When the wrong transmission fluid pressure switch is turned on, an A/T
clutch pressure control solenoid valve C turn-on malfunction is detected 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

20 seconds

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

Shift lever
position

D

No active
DTCs

P0122, P0123, P0705, P0716, P0717, P0718, P0721, P0722, P0723, P0746, P0747,
P0751, P0752, P0756, P0757, P0761, P0762, P0766, P0767, P0776, P0777, P0796,
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

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

Page 214 © 2005 Mitchell Repair Information Company, LLC.

Malfunction Threshold

The 2nd clutch transmission fluid switch is ON against the 3rd —> 4th gear upshift command for as long as
20 seconds.

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 P0812 (65): ADVANCED DIAGNOSTICS

DTC P0812: OPEN IN TRANSMISSION RANGE SWITCH ATP R SWITCH CIRCUIT

Fig. 172: Transmission Range Switch ATP R Switch Circuit Diagram

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

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

Page 215 © 2005 Mitchell Repair Information Company, LLC.

TRANSMISSION RANGE SWITCH CONTACT POINT INPUT MATRIX

General Description

The transmission range switch is attached to the control shaft. Operating the shift lever makes the control
shaft rotate via the shift cable. The A/T gear position indicator indicates which position is selected according
to the Low/High signal combinations which vary based on shift lever position. The control shaft changes the
position of the transmission range switch, activates the manual valve, and switches hydraulic pressure to
shift the transmission through forward/neutral/reverse. The transmission range switch signal is used to
determine the shift schedule. The voltage is 12 V (High) at the powertrain control module (PCM) input
terminal when each transmission range switch position is open, and it is 0 V (Low) when each switch is
closed. If the R switch is OPEN with the shift lever in the R position, the PCM detects a switch OPEN
failure and a DTC is stored.

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

MONITOR DESCRIPTION CHART

Enable Conditions

ENABLE CONDITIONS

Malfunction Threshold

The RVS signal is detected but the R signal is not detected for at least 2 seconds.

Driving Pattern

1. Start the engine, shift to the R position, and drive the vehicle at a speed of 3 mph (5 km/h) or less for

at least 2 seconds.

Shift lever position

Input per switch

P

R

N

D

D3

FWD

RVS

P

o

X

X

X

X

X

o

R

X

o

X

X

X

X

o

N

X

X

o

X

X

X

o

D

X

X

X

o

X

o

X

D3

X

X

X

X

o

o

X

o: Closed X: Open

Execution

Continuous

Sequence

None

Duration

Depending on the driving pattern

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 speed

1,000 rpm

Shift lever position

R

No active DTCs

P0705, P0716, P0717, P0721, P0722, P1717

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

me

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

Page 216 © 2005 Mitchell Repair Information Company, LLC.

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