Honda Element. Manual — part 21

Fig. 55: Fuel Tank Pressure (FTP) Sensor Voltage - Graph

Fig. 56: Fuel Tank Pressure Sensor Output - Graph

General Description

The fuel tank pressure (FTP) sensor is installed on the evaporative emission (EVAP) canister. The FTP sensor is
used to detect leaks in the EVAP system. The engine control module (ECM)/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. 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 ECM/PCM detects a
malfunction and stores a DTC.

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

2007 Honda Element EX

2007 ENGINE PERFORMANCE Advanced Diagnostics - Element

MONITOR DESCRIPTION

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 ECM/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 P0452 (91): ADVANCED DIAGNOSTICS

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

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, P0453, P2101, P2108, P2118, P2122,
P2123, P2127, P2128, P2135, P2138, P2176, U0107

2007 Honda Element EX

2007 ENGINE PERFORMANCE Advanced Diagnostics - Element

Fig. 57: Fuel Tank Pressure Sensor - Circuit Diagram

Fig. 58: Fuel Tank Pressure (FTP) Sensor Output Voltage - Graph

Fig. 59: Fuel Tank Pressure - Graph

2007 Honda Element EX

2007 ENGINE PERFORMANCE Advanced Diagnostics - Element

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 engine control module (ECM)/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 ECM/PCM detects a malfunction and stores a
DTC.

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

MONITOR DESCRIPTION

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 during the first drive cycle, a Temporary DTC is stored in the ECM/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

Execution

Once per driving cycle

Sequence

None

Duration

3 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

-

Other

At idle

2007 Honda Element EX

2007 ENGINE PERFORMANCE Advanced Diagnostics - Element