Acura RL. Instruction — page 25

sensor output voltage. The FTP sensor output voltage rises as the fuel tank pressure increases. Conversely,
the FTP sensor output voltage drops as the fuel tank pressure decreases. Rapid changes in the FTP sensor
output voltage due to electrical noise or an intermittent open during the EVAP leak detection may cause
incorrect leak detection, so abnormal output is monitored.

If the FTP sensor output voltage changes a specified number of times within a set time, the PCM detects a
malfunction and stores a DTC.

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

MONITOR DESCRIPTION CHART

Enable Conditions

ENABLE CONDITIONS

Malfunction Threshold

The FTP sensor output fluctuates by 0.3 kPa (0.1 in.Hg, 2 mmHg) or more at least five times within 3
seconds.

Driving Pattern

Start the engine in a cold condition, and let it idle for at least 20 seconds.

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

Execution

Once per driving cycle

Sequence

None

Duration

20 seconds or more

DTC Type

Two drive cycles, MIL ON

OBD Status

PASSED/FAILED/NOT COMPLETED (STILL TESTING)

Condition

Minimum

Maximum

Elapsed time after
starting the engine

2 seconds

Throttle position

Fully closed

No active DTCs

P0122, P0123, P0222, P0223, P0452, P0452, P0453, P0453, P2101, P2108,
P2118, P2122, P2123, P2127, P2128, P2135, P2138, P2176, U0107

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

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Clear command or by disconnecting the battery.

DTC P0452 (91): ADVANCED DIAGNOSTICS

DTC P0452: FUEL TANK PRESSURE (FTP) SENSOR CIRCUIT LOW VOLTAGE

Fig. 71: Fuel Tank Pressure Sensor (Low Voltage) — Circuit Diagram

Fig. 72: Fuel Tank Pressure Sensor Output Voltage Graph

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

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Friday, June 05, 2009 2:32:03 PM

Page 98

© 2005 Mitchell Repair Information Company, LLC.

Fig. 73: Fuel Tank Pressure Sensor Failure Operation Graph

General Description

The fuel tank pressure (FTP) sensor is installed on the evaporative emission (EVAP) canister and detects the
fuel tank pressure. The FTP sensor is used to detect leaks in the EVAP system.

The powertrain control module (PCM) monitors the FTP sensor output voltage. The FTP sensor output
voltage rises as the fuel tank pressure increases. Conversely, the FTP sensor output voltage drops as the fuel
tank pressure decreases. If the FTP sensor output voltage does not reach a target value within a set time after
starting the engine in a cold condition, the PCM detects a malfunction and stores a DTC.

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

MONITOR DESCRIPTION CHART

Enable Conditions

ENABLE CONDITIONS

Malfunction Threshold

The output from the fuel tank pressure sensor is less than -7 kPa (-2.1 in.Hg, -55 mmHg) for at least 3
seconds.

Driving Pattern

Start the engine in a cold condition, and let it idle until the radiator fan comes on.

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.

Execution

Once per driving cycle

Sequence

None

Duration

3 seconds or more

DTC Type

One drive cycle, MIL ON

OBD Status

PASSED/FAILED/NOT COMPLETED (STILL TESTING)

Condition

Minimum

Maximum

Elapsed time after starting the engine

2 seconds

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

me

Friday, June 05, 2009 2:32:03 PM

Page 99

© 2005 Mitchell Repair Information Company, LLC.

DTC P0453 (91): ADVANCED DIAGNOSTICS

DTC P0453: FUEL TANK PRESSURE (FTP) SENSOR CIRCUIT HIGH VOLTAGE

Fig. 74: Fuel Tank Pressure Sensor (High Voltage) — Circuit Diagram

Fig. 75: Fuel Tank Pressure Sensor Output Voltage Graph

Fig. 76: Fuel Tank Pressure Sensor Failure Operation Graph

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

me

Friday, June 05, 2009 2:32:03 PM

Page 100 © 2005 Mitchell Repair Information Company, LLC.

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