Acura RL. Instruction — page 77

in the D position for at least 1.5 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 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 P1745 (45): ADVANCED DIAGNOSTICS

DTC P1745: PROBLEM IN SHIFT CONTROL SYSTEM: SERVO CONTROL VALVE STUCK
OFF OR SERVO VALVE STUCK OFF

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2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

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Fig. 252: Shift Control System — Operation Diagram

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

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Page 306 © 2005 Mitchell Repair Information Company, LLC.

Fig. 253: Gear Position Vs Shift Status Graph

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

Fig. 254: Shift Solenoid Valve Output (D Position)

General Description

The servo control valve and the servo valve are incorporated into the control circuit of the transmission. The
servo control valve and the servo valve operate when the shift lever is in the D, D3, or M position due to line
pressure and turn off when the shift lever is in the P, R, or N position.

The PCM monitors the mainshaft speed and the 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 servo control
valve OFF or servo valve OFF failure is detected and a DTC is stored.

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

MONITOR DESCRIPTION CHART

Execution

Continuous

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

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Enable Conditions

ENABLE CONDITIONS

Malfunction Threshold

One of these symptoms occurs.

MALFUNCTION THRESHOLD SYMPTOM 1

MALFUNCTION THRESHOLD SYMPTOM 2

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

Sequence

None

Duration

0.5 second (symptom 1-A, 1-B)
2.0 seconds (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 coolant temperature

50°F (10°C)

(1)

ATF temperature

-4°F (-20°C)

(1)

Vehicle speed

5 mph (9 km/h)

Accelerator pedal position
variation

6 %/ 20 milliseconds

(1)

Shift lever position

D, D3

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, P0797, P0842,
P0843, P0847, P0848, P0962, P0963, P0966, P0967, P0970,
P0971, P0973, P0974, P0976, P0977, P0979, P0980, P0982,
P0983, P1743, P1744

(1)

Symptom 1

Symptom

Gear position commanded by the PCM

Actual gear position

1-A

2nd —> 3rd gear upshift

The engine speed flares

1-B

3rd —> 4th gear upshift

The engine speed flares

Symptom

Gear position commanded by the PCM

Actual gear position

2

Driving in 5th gear

Neutral

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

me

Friday, June 05, 2009 2:32:07 PM

Page 308 © 2005 Mitchell Repair Information Company, LLC.

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