Acura RL. Instruction — page 79

When a malfunction is detected, the MIL comes on and the DTC and the freeze frame data are stored in the
PCM memory.

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

DTC P2108 (40): ADVANCED DIAGNOSTICS

DTC P2108: THROTTLE ACTUATOR CONTROL MODULE PROBLEM

Fig. 256: Throttle Actuator Control Module — Communication Diagram

General Description

The electronic throttle control system 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 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 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 CPU in the throttle actuator control module performs self-diagnosis for the ROM, the RAM, and the
A/D converter. If internal data is found to be abnormal, a malfunction is detected and the malfunction data is
transmitted to the PCM. When the PCM receives the malfunction data from the throttle actuator control

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

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Page 313 © 2005 Mitchell Repair Information Company, LLC.

module, the PCM detects a malfunction in the throttle actuator control module and stores a DTC. When the
PCM monitors the serial signal between the PCM and the throttle actuator control module and finds these
signals do not agree, the PCM detects a malfunction 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 must be met for at least 0.2 seconds.

Data read from the ROM is abnormal.

Data read from the RAM is abnormal.

The A/D converter standard voltage is out of specified value.

The serial signals between the PCM and the throttle actuator control module do not agree.

Diagnosis Details

Conditions for illuminating the MIL

When a malfunction is detected, the MIL comes on and the DTC and the freeze frame data are stored in the
PCM memory.

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

DTC P2118 (40): ADVANCED DIAGNOSTICS

DTC P2118: THROTTLE ACTUATOR CURRENT RANGE/PERFORMANCE PROBLEM

Execution

Continuous

Sequence

None

Duration

0.2 seconds or more

DTC Type

One drive cycle, MIL ON

OBD Status

N/A

Condition

Minimum

Maximum

Battery voltage

8.0 V

Ignition switch

ON

No active DTCs

P2101, P2118, P2135, P2176, U0107

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

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

Page 314 © 2005 Mitchell Repair Information Company, LLC.

Fig. 257: Throttle Actuator Current — Circuit Diagram

General Description

The electronic throttle control system 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 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 target position signal is then transmitted to

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

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

Page 315 © 2005 Mitchell Repair Information Company, LLC.

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.

When the output current to the throttle actuator exceeds the specification for a set time, the throttle actuator
control module detects a malfunction and transmits the malfunction data to the PCM. When the PCM
receives the malfunction data from the throttle actuator control module, the PCM detects a malfunction of
the throttle actuator system and stores a DTC.

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

MONITOR DESCRIPTION CHART

Enable Conditions

ENABLE CONDITIONS

Malfunction Threshold

The current flow to the throttle actuator is 16 A or more for at least 0.2 seconds.

Diagnosis Details

Conditions for illuminating the MIL

When a malfunction is detected, the MIL comes on and the DTC and the freeze frame data are stored in the
PCM memory.

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

DTC P2122 (37): ADVANCED DIAGNOSTICS

DTC P2122: ACCELERATOR PEDAL POSITION (APP) SENSOR A (THROTTLE POSITION
SENSOR D) CIRCUIT LOW VOLTAGE

Execution

Continuous

Sequence

None

Duration

0.2 seconds or more

DTC Type

One drive cycle, MIL ON

OBD Status

N/A

Condition

Minimum

Maximum

Battery voltage

6.0 V

Ignition switch

ON

No active DTCs

P2101, P2108, P2135, P2176, U0107

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

me

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

Page 316 © 2005 Mitchell Repair Information Company, LLC.

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