Honda Element. Manual — part 23



If the variation corresponding to pressure is more than a specified value before a specified duration has
passed, it is defined as "no 0.09 inch leak", judgement of detection of a 0.09 inch leak is completed, and
goes to 0.02 inch leak monitor.

Step 2:

After the engine has stopped, the ECM/PCM monitors the variation of the FTP sensor output to detect "no 0.02
inch leak" depending on the variation corresponding to the increasing pressure inside the fuel tank.



If "no 0.02 inch leak" is detected, it is identified as normal; the diagnosis is complete.



If the pressure inside the fuel tank does not increase for a specified value or more within a specified
duration, goes to step 3.

Step 3:

The ECM/PCM continues to monitor the FTP sensor output to detect "no 0.02 inch leak" depending on the
variation corresponding to the decreasing pressure inside the fuel tank. until the detection completes.



If a "0.02 inch leak" is detected, it is identified as a malfunction; the diagnosis is complete.



If "no leakage" is detected, it is identified as normal; the diagnosis is complete.



If the pressure is not atmospheric pressure or less when the detection is completed, reserve identification
and the diagnosis is complete.

Step 4:

After the engine has stopped, the ECM/PCM monitors the variation of the FTP sensor output to detect
atmospheric air failure, after keeping the canister vent opened for a specified duration to stabilize the pressure
inside the fuel tank.



If the pressure inside the fuel tank after a specified duration has passed deviated exceeding a specified
value from the sensor zero point, and if oil is not identified to fuel during EONV is performed,
atmospheric air open failure is detected.

Step 5:

After the engine has stopped, the ECM/PCM monitors the variation of the FTP sensor output to detect FTP
sensor flickering failure, after keeping the canister vent opened for a specified duration to stabilize the pressure
inside the fuel tank.



If the deviation of pressure inside the fuel tank and an average value after a specified duration has passed
exceeded a specified value for more than a specified duration, failure of FTP sensor flickering is detected.

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

MONITOR DESCRIPTION

Execution

Once per driving cycle

2007 Honda Element EX

2007 ENGINE PERFORMANCE Advanced Diagnostics - Element

Enable Conditions

ENABLE CONDITIONS

Malfunction Threshold

The variation of pressure inside the fuel tank is 0.03 kPa (0.009 in.Hg, 0.24 mmHg) or more.

Confirmation Procedure with the HDS

Do the EVAP FUNCTION TEST in the INSPECTION MENU with the HDS.

Driving Pattern

1. After the vehicle has been left for an appropriate amount of time as specified, with the engine coolant

temperature and intake air temperature within the specified range, start the engine.

2. Warm up the engine at idle until the radiator fan comes on.

Sequence

None

Duration

31 minutes, 37 seconds or less

DTC Type

Two drive cycles, MIL ON

OBD Status

N/A

Condition

Minimum

Maximum

Elapsed time before
starting the engine

6 hours

-

Initial condition A

(1)

-

18 °F (10 °C)

Initial condition B

(2)

-

18 °F (10 °C)

Initial engine coolant
temperature

40 °F (5 °C)

95 °F (35 °C)

Initial intake air
temperature

40 °F (5 °C)

95 °F (35 °C)

Barometric pressure

76 kPa (23.0 in.Hg, 569 mmHg)

-

Battery voltage

10.5 V

-

No active DTCs

P0111, P0112, P0113, P0116, P0117, P0118, P0125, P0443, P0451, P0452,
P0453, P0496, P0497, P0498, P0499, P0685, P1116, P1454, P145C, P2227,
P2228, P2229, P2422, P2610

Others

Other than when there is excessive vapor generation (fuel level is not full)
Avoid abrupt acceleration, deceleration, and turns
Test-drive on a flat road to avoid misdetection
No refueling is required

(1)

The initial intake air temperature minus the current intake air temperature

(2)

The initial engine coolant temperature minus the initial intake air temperature

2007 Honda Element EX

2007 ENGINE PERFORMANCE Advanced Diagnostics - Element

3. Drive the vehicle immediately at a speed between 45 - 75 mph (72 - 120 km/h) for at least 20 minutes.

4. After stopping the engine, turn the ignition switch off, and leave the vehicle for 32 minutes or more

(EONV executes).



Drive the vehicle in this manner only if the traffic regulations and ambient conditions allow.

Diagnosis Details

Conditions for illuminating the MIL

When a malfunction is detected during the first drive cycle with the ECT and IAT at engine start-up within the
specified temperature range, a Temporary DTC is stored in the ECM/PCM memory. If the malfunction recurs
during the next (second) drive cycle with the ECT and IAT at engine start-up within the specified temperature
range, 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 P0456 (90): ADVANCED DIAGNOSTICS

DTC P0456: EVAPORATIVE EMISSION (EVAP) SYSTEM VERY SMALL LEAK DETECTED

Fig. 65: Evaporative Emission (EVAP) System - Diagram

2007 Honda Element EX

2007 ENGINE PERFORMANCE Advanced Diagnostics - Element

Fig. 66: Evaporative Emission (EVAP) System Diagnosis Execution

General Description

The evaporative emission (EVAP) leak detection system uses an engine off natural vacuum (EONV) method.
The EONV method detects leakage from the change in fuel tank pressure via the fuel tank pressure (FTP)
sensor with the engine off.

Here is an overview of the malfunction detection for the EONV method:

Step 1: Judgement of detection of 0.09 inch leak as normal operation

Step 2: Judgement of detection of 0.02 inch leak as normal operation

Step 3: Detection of 0.02 inch leak

Step 4: Detection of atmospheric air open failure

Step 5: Flickering of the FTP sensor

< Step 1, 2 and 3 proceed simultaneously. Step 4 and 5 proceed simultaneously. >

Step 1:

After the engine has stopped, the engine control module (ECM)/powertrain control module (PCM) monitors the
variation of the FTP sensor output to detect "no 0.09 inch leak" depending on the variation corresponding to the
pressure inside the fuel tank.



If the variation corresponding to the pressure is less than a specified value and continues for a specified
duration, it is identified as a malfunction of "0.09 inch leak" and the diagnosis completes.

2007 Honda Element EX

2007 ENGINE PERFORMANCE Advanced Diagnostics - Element