Acura RL. Instruction — page 78

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 P1780 (49): ADVANCED DIAGNOSTICS

DTC P1780: PROBLEM IN SHIFT CONTROL SYSTEM

General Description

When the powertrain control module (PCM) detects a mechanical malfunction in the automatic
transmission, the transmission switches to a default mode according to the malfunction, and this DTC is
stored.

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

MONITOR DESCRIPTION CHART

Enable Conditions

ENABLE CONDITIONS

Malfunction Threshold

The A/T control switches to the default mode due to a mechanical malfunction.

Driving Pattern

Start the engine, and accelerate the vehicle until the transmission shifts into 5th gear in the D position.

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

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

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

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Page 309 © 2005 Mitchell Repair Information Company, LLC.

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 P2101 (40): ADVANCED DIAGNOSTICS

DTC P2101: THROTTLE ACTUATOR SYSTEM MALFUNCTION

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

me

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

Page 310 © 2005 Mitchell Repair Information Company, LLC.

Fig. 255: Throttle Actuator System — Circuit Diagram

General Description

The electronic throttle control system (ETCS) controls the throttle valve opening. The system is composed
of the throttle actuator, the throttle valve, throttle position (TP) sensors A and B, the throttle actuator control
module, the throttle actuator control module relay, the accelerator pedal position (APP) sensor, and the
powertrain control module (PCM).

The accelerator pedal position (APP) sensor is operated via the throttle cable to determine the accelerator
opening value when the driver presses the accelerator pedal. The accelerator pedal opening value is
converted to a signal in the APP sensor and transmitted to the PCM to compute the target position. The

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

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Page 311 © 2005 Mitchell Repair Information Company, LLC.

target position signal is then transmitted to the throttle actuator control module.

The throttle actuator control module determines the throttle valve target position according to the signal
received and operates the throttle actuator to move the throttle valve to the target position. The actual
throttle valve position is determined by TP sensor A installed in the throttle body.

The throttle actuator control module compares the throttle valve target opening angle and the actual throttle
valve opening angle from TP sensor A, and when the difference exceeds the specification, the throttle
actuator control module transmits the malfunction data to the PCM. When the PCM receives the
malfunction data from the throttle actuator control module, the PCM detects the malfunction of the throttle
actuator system and a DTC is stored.

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

MONITOR DESCRIPTION CHART

Enable Conditions

ENABLE CONDITIONS

Malfunction Threshold

One of the conditions in this table must be met for at least 0.25 seconds* (0.5 seconds**).

MALFUNCTION THRESHOLD

Diagnosis Details

Conditions for illuminating the MIL

Execution

Continuous

Sequence

None

Duration

0.25 seconds or more

(1)

, 0.5 seconds or more

(2)

DTC Type

One drive cycle, MIL ON

OBD Status

N/A

(1)

Throttle valve closed direction

(2)

Throttle valve open direction

Condition

Minimum

Maximum

Battery voltage

6.0 V

Ignition switch

ON

No active DTCs

P2108, P2118, P2135, P2176, U0107

Throttle valve target position

Difference between the throttle valve target

position and the actual throttle valve position

4° or more

5.4° or more

10°

5.7° or more

15°

6° or more

90°

6° or more

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

me

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

Page 312 © 2005 Mitchell Repair Information Company, LLC.

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