Acura RL. Instruction — page 96

The fuel tank pressure (FTP) sensor output indicates about atmospheric pressure 0 kPa (0 in.Hg, 0 mmHg)
before purge starts since the evaporative emission (EVAP) canister vent shut valve is normally open (open
to the atmosphere). The sensor indicates a negative pressure value (vacuum) during purging.

When the FTP sensor indicates vacuum after starting the engine, there is the possibility of an FTP sensor
zero point shift failure or an EVAP canister vent shut valve stuck closed failure. So the powertrain control
module (PCM) monitors the FTP sensor output after purge starts. The PCM detects a malfunction of the
EVAP canister vent shut valve if the output indicates excessive vacuum.

However, if the fuel tank internal pressure is below the specified value (excessive vacuum is detected) when
starting the engine, the malfunction detection should be done as follows because it is difficult to distinguish
the FTP sensor range problem (P1454) from the EVAP canister vent shut valve stuck closed (P2422).

1. If neither Temporary DTC (P1454 nor P2422) is stored, both DTCs are stored.

2. If both Temporary DTCs (P1454 and P2422) are stored and excessive vacuum is detected, both DTCs

are stored.

3. If either Temporary DTC (P1454 or P2422) is stored and excessive vacuum is detected, the PCM

stores the DTC of the Temporary DTC that was stored.

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

MONITOR DESCRIPTION CHART

Enable Conditions

ENABLE CONDITIONS

Execution

Once per driving cycle

Sequence

None

Duration

3.04 seconds or more

(1)

DTC Type

Two drive cycles, MIL ON

OBD Status

PASSED/FAILED/NOT COMPLETED (STILL TESTING)

(1)

Elapsed time after the FTP sensor output exceeds the malfunction threshold.

Condition

Minimum

Maximum

Elapsed time after starting the
engine

(1)

10 seconds

Time to judge excessive negative
pressure

(1)

3 seconds

Engine coolant temperature

(2)

140°F (60°C)

Fuel tank pressure

(1)

-2 kPa (-0.4 in.Hg, -10 mmHg)

Battery voltage

10.5 V

Fuel trim

0.73

1.47

Fuel feedback

Closed loop

Monitoring priority

P0455, P0457, P0497
P0107, P0108, P0116, P0117, P0118, P0125, P0134, P0135,
P0154, P0155, P0335, P0339, P0443, P0451, P0452, P0453,
P0496, P0498, P0499, P1109, P1116, P1128, P1129, P1172,

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

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Page 381 © 2005 Mitchell Repair Information Company, LLC.

Malfunction Threshold

The output from the fuel tank pressure sensor is -6 kPa (-1.6 in.Hg, -40 mmHg) or less for at least 3.04
seconds.

Confirmation Procedure with the HDS

Do the EVAP CVS ON in the INSPECTION MENU with the HDS.

Driving Pattern

Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan
comes on, then let it idle.

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 P2552 (40): ADVANCED DIAGNOSTICS

DTC P2552: THROTTLE ACTUATOR CONTROL MODULE RELAY MALFUNCTION

No active DTCs

P1174, P2195, P2197, P2227, P2228, P2229, P2237, P2238,
P2240, P2241, P2243, P2245, P2247, P2249, P2251, P2252,
P2254, P2255, P2627, P2628, P2630, P2631

(1)

Excessive negative pressure is detected.

(2)

Condition to start the purge control.

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

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Page 382 © 2005 Mitchell Repair Information Company, LLC.

Fig. 303: Throttle Actuator Control Module Relay 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 in the throttle body, 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, transmitted to the powertrain control module (PCM), and then

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

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Page 383 © 2005 Mitchell Repair Information Company, LLC.

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 sensors A and B installed in the throttle body.

The PCM detects the malfunction of the throttle actuator control module relay ON, and a DTC is stored if
the serial signal from the throttle actuator control module is input for more than a set time after the throttle
actuator control module relay is turned OFF and throttle actuator control module operation is stopped.

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

MONITOR DESCRIPTION CHART

Enable Conditions

ENABLE CONDITIONS

Malfunction Threshold

The serial signal is input from the throttle actuator control module for at least 2.0 seconds after the throttle
actuator control module relay is turned OFF.

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 P2610 (132): ADVANCED DIAGNOSTICS

Execution

Once per driving cycle

Sequence

None

Duration

2.0 seconds or more

DTC Type

One drive cycle, MIL ON

OBD Status

N/A

Condition

Minimum

Maximum

Battery voltage

8.0 V

Ignition switch

OFF

No active DTCs

P1684, P2101, P2108, P2118, P2135, P2176, U0107

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

me

Friday, June 05, 2009 2:32:08 PM

Page 384 © 2005 Mitchell Repair Information Company, LLC.

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