Acura RL. Manual - part 58

Fig. 185: 4th Clutch Transmission Fluid Pressure Switch Circuit Diagram

Fig. 186: Gear Position VS Shift Status Graph

General Description

The 4th clutch transmission fluid pressure switch is installed in the hydraulic pressure circuit to the 4th
clutch. When hydraulic pressure is supplied to the 4th clutch, the switch is turned ON. When hydraulic
pressure is not supplied to the 4th clutch, the switch is turned OFF. The signal from the 4th clutch
transmission fluid pressure switch is input to the powertrain control module (PCM). The PCM detects the
hydraulic pressure supply conditions at the gear change to 4th gear (3rd --> 4th, 5th --> 4th) to reduce the
shock that occurs at the gear change.

If the 4th clutch transmission fluid pressure switch is ON while driving, and the speed ratio of the output
shaft (countershaft) to input shaft (mainshaft) is other than 4th gear (the ratio is Neutral or 5th), the PCM
detects a 4th clutch transmission fluid pressure switch failure and stores DTC.

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

MONITOR DESCRIPTION CHART

Execution

Continuous

Sequence

None

Duration

2 seconds or more

DTC Type

One drive cycle, MIL OFF, D indicator blinks

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics - RL

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

Enable Conditions

ENABLE CONDITIONS

Malfunction Threshold

The 4th clutch transmission fluid pressure switch input signal is low when driving in 5th gear.

Driving Pattern

Start the engine, and drive the vehicle in the D position and 5th gear for at least 2 seconds.



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

Diagnosis Details

Conditions for illuminating the indicator

When a malfunction is detected, the D indicator blinks, and the DTC and the freeze frame data are stored in
the PCM memory. The MIL does not come on.

Conditions for clearing the DTC

The DTC and the freeze frame data can be cleared by using the scan tool Clear command or by
disconnecting the battery.

DTC P0873 (27): ADVANCED DIAGNOSTICS

DTC P0873: OPEN IN 4TH CLUTCH TRANSMISSION FLUID PRESSURE SWITCH CIRCUIT,
OR 4TH CLUTCH TRANSMISSION FLUID PRESSURE SWITCH STUCK OFF

OBD Status

PASSED/FAILED/NOT COMPLETED (STILL TESTING)

Condition

Minimum

Maximum

Battery
voltage

11.0 V

No active
DTCs

P0116, P0117, P0118, P0122, P0123, P0705, P0716, P0717, P0721, P0722, P0746,
P0747, P0751, P0752, P0756, P0757, P0761, P0762, P0766, P0767, P0776, P0777,
P0796, P0797, P0842, P0843, P0847, P0848, P0873, 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

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

Fig. 187: 4th Clutch Transmission Fluid Pressure Switch Circuit Diagram

Fig. 188: Gear Position VS Shift Status Graph

General Description

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

MONITOR DESCRIPTION CHART

Enable Conditions

ENABLE CONDITIONS

Execution

Continuous

Sequence

None

Duration

2 seconds or more

DTC Type

One drive cycle, MIL OFF, D indicator blinks

OBD Status

PASSED/FAILED/NOT COMPLETED (STILL TESTING)

Condition

Minimum

Maximum

Battery
voltage

11.0 V

P0116, P0117, P0118, P0122, P0123, P0705, P0716, P0717, P0721, P0722, P0746,
P0747, P0751, P0752, P0756, P0757, P0761, P0762, P0766, P0767, P0776, P0777,

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics - RL

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

Malfunction Threshold

The 4th clutch transmission fluid pressure switch input signal is high when driving in 4th gear.

Driving Pattern

Start the engine, and drive the vehicle in the D position and 4th gear for at least 2 seconds.



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

Diagnosis Details

Conditions for illuminating the indicator

When a malfunction is detected, the D indicator blinks, and the DTC and the freeze frame data are stored in
the PCM memory. The MIL does not come on.

Conditions for clearing the DTC

The DTC and the freeze frame data can be cleared by using the scan tool Clear command or by
disconnecting the battery.

DTC P0957 (24): ADVANCED DIAGNOSTICS

DTC P0957: SHORT IN TRANSMISSION GEAR SELECTION SWITCH CIRCUIT, OR
TRANSMISSION GEAR SELECTION SWITCH STUCK ON

Fig. 189: Transmission Gear Selection Switch Circuit Diagram

No active
DTCs

P0796, P0797, P0842, P0843, P0847, P0848, P0872, 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

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

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