Acura RL. Instruction — page 82

Enable Conditions

ENABLE CONDITIONS

Malfunction Threshold

One of these conditions must be met for at least 0.2 seconds.

The difference between the TP sensor A voltage and the TP sensor B voltage is 200 mV (5°) or less.

The difference between the throttle valve positions that TP sensor A and TP sensor B determined
exceeds the value shown in this table.

MALFUNCTION THRESHOLD

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 P2138 (37): ADVANCED DIAGNOSTICS

DTC P2138: ACCELERATOR PEDAL POSITION (APP) SENSOR A/B (THROTTLE POSITION
SENSOR D/E) INCORRECT VOLTAGE CORRELATION

OBD Status

N/A

Condition

Minimum

Maximum

TP sensor B voltage

2.3 V

Ignition switch

ON

No active DTCs

P0122, P0123, P0222, P0223, P2101, P2108, P2118, P2176, U0107

Other

After the throttle valve fully closed position is registered

Throttle valve position determined by TP

sensor A

Difference between TP sensor A and TP sensor

B

1.8° or more

83.3°

14.7° or more

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

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Page 325 © 2005 Mitchell Repair Information Company, LLC.

Fig. 264: Accelerator Pedal Position Sensor A/B — Circuit Diagram

Fig. 265: Accelerator Pedal Position Sensor Output Voltage Graph

General Description

Accelerator pedal position (APP) sensor A and accelerator pedal position (APP) sensor B are
potentiometers, and they are installed in the engine compartment.

Accelerator pedal position (APP) sensors A and B are 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 APP sensors A and B and transmitted to the powertrain control module (PCM) to
compute the target position. The target position signal is transmitted to the throttle actuator control module

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

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Page 326 © 2005 Mitchell Repair Information Company, LLC.

via the circuit.

APP sensor A is for the primary control, and APP sensor B is a back-up of APP sensor A in case it
malfunctions. Both sensors compare their output voltage to each other for malfunction detection.

When the voltage difference of APP sensor B is out of a fixed range for a set time, 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 0.3 second.

If the APP sensor B voltage exceeds the range from 0 V or less to 0.361 V or more when the APP
sensor A voltage is 0.361 V.

If the APP sensor B voltage exceeds the range from 2.319 V or less to 2.681 V or more when the APP
sensor A voltage is 4.995 V.

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 P2176 (40): ADVANCED DIAGNOSTICS

Execution

Continuous

Sequence

None

Duration

0.3 second or more

DTC Type

One drive cycle, MIL ON

OBD Status

N/A

Condition

Ignition switch

ON

No active DTCs

P2122, P2123, P2127, P2128

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

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

Page 327 © 2005 Mitchell Repair Information Company, LLC.

DTC P2176: THROTTLE ACTUATOR CONTROL SYSTEM IDLE POSITION NOT LEARNED

Fig. 266: Throttle Actuator Control System Idle Position

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 throttle actuator control module transmits a signal to the throttle actuator and moves the throttle valve to
the fully closed position to register the throttle valve fully closed position after the ignition switch is turned
ON.

The throttle actuator control module detects the malfunction of the throttle actuator control system, and it
transmits a malfunction signal to the PCM when the registration of the throttle valve fully closed position is
not completed within a predetermined time or the registered value is out of predetermined range after the
ignition switch is turned ON. When the PCM receives the malfunction data from the throttle actuator control
module, the PCM detects a malfunction in the throttle actuator control system and stores a DTC.

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

MONITOR DESCRIPTION CHART

Execution

Once per driving cycle

Sequence

None

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

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

Page 328 © 2005 Mitchell Repair Information Company, LLC.

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