Honda Element. Manual - part 66

Fig. 195: Malfunction Judgement Flow Chart Of FTP Sensor And EVAP Canister Vent Shut Valve

General Description

The fuel tank pressure is about 0 kPa (0 in.Hg, 0 mmHg) when starting a cold engine. When the fuel tank
pressure (FTP) sensor output value is out of a specified range and the engine control module (ECM)/powertrain
control module (PCM) judges that there's no other cause [no evaporative emission (EVAP) canister vent shut
valve failure, etc.] of the FTP sensor zero point shift, the ECM/PCM detects an FTP sensor malfunction.

However, if the FTP sensor output when starting the engine is a prescribed negative value or less (excessive
negative pressure is detected), the malfunction judgment should be done as follows because it is difficult to
distinguish the FTP sensor zero point shift (P1454) from the EVAP canister vent shut valve failure (P2422).

1. If either Temporary DTC P1454 or P2422 is not stored, the ECM/PCM stores both DTCs.

2. If both P1454 and P2422 Temporary DTCs are stored and an excessive negative pressure is detected, both

P1454 and P2422 DTCs are stored.

3. If either Temporary DTC P1454 or P2422 is stored and an excessive negative pressure is detected, the

ECM/PCM stores the DTC of the temporary DTC that was stored.

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

MONITOR DESCRIPTION

Enable Conditions

ENABLE CONDITIONS

Execution

Once per driving cycle

Sequence

P0452, P0453, P2422 are judged as OK

Duration

8 seconds or more

DTC Type

Two drive cycles, MIL ON

OBD Status

PASSED/FAILED/NOT COMPLETED (STILL TESTING)

2007 Honda Element EX

2007 ENGINE PERFORMANCE Advanced Diagnostics - Element

Malfunction Threshold



The FTP sensor output fluctuates by 0.7 kPa (0.2 in.Hg, 5 mmHg) or more, or -0.7 kPa (-0.2 in.Hg, -5
mmHg) or less, for at least 8 seconds.



The FTP sensor output value is -1.3 kPa (-0.3 in.Hg, -10 mmHg) or less for at least 8 seconds.

Confirmation Procedure with the HDS

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

Driving Pattern

Start the engine, 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
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 P145C (90): ADVANCED DIAGNOSTICS

DTC P145C: EVAPORATIVE EMISSION (EVAP) SYSTEM MALFUNCTION

Condition

Minimum

Maximum

Elapsed time
after starting the
engine

10 seconds

No active DTCs

P0101, P0102, P0103, P0107, P0108, P0117, P0118, P0134, P0135, P0300, P0301,
P0302, P0303, P0304, P0335, P0339, P0443, P0451, P0452, P0453, P0496, P0497,
P0498, P0499, P1128, P1129, P1157, P1172, P145C, P2195, P2227, P2228, P2229,
P2238, P2252, P2422

Others

The EVAP canister vent shut valve has not been closing
Stopping the purge control

2007 Honda Element EX

2007 ENGINE PERFORMANCE Advanced Diagnostics - Element

Fig. 196: Evaporative Emission (EVAP) System Diagram

General Description

The fuel (vapor) vaporized in the fuel tank is stored in the canister temporarily and introduced in the engine
through the evaporative emission (EVAP) canister purge valve. The engine control module (ECM)/powertrain
control module (PCM) controls the vapor amount introduced in the engine by repeating switching the power of
the EVAP canister purge valve at a constant frequency according to the condition of the engine.

< STEP 1 >

The EVAP canister purge valve drives normally (EVAP canister purge valve OPEN OK) and detects that the
purge flow is normal when the pulse of the EVAP canister purge valve drive cycle is transmitted to fuel tank
pressure (FTP) sensor by the purge flow (pulse method).

OK determination: Pulse exists (P145C OK)



P0497 Purge flow OK



P0496 EVAP canister purge valve Open fix OK

NG determination: No pulse (P145C NG)



Either purge flow P0497 abnormality or P0496 EVAP canister purge valve OPEN failure.



In this case, classify the failure part according to < STEP 2 >.

< STEP 2 >

2007 Honda Element EX

2007 ENGINE PERFORMANCE Advanced Diagnostics - Element

In case there is no pulse, it is determined either no purge flow or EVAP canister purge valve OPEN fix as
follows:

When the FTP sensor fluctuates from negative pressure condition to atmospheric pressure side after the ignition
is turned off: P0496 EVAP canister purge valve OPEN fix

When there is no fluctuation of the FTP sensor: P0497 purge flow NG

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

MONITOR DESCRIPTION

Enable Conditions

ENABLE CONDITIONS

Malfunction Threshold

The pulse method from the fuel tank pressure sensor is 0.01 % or less for at least 31 seconds.

Confirmation Procedure with the HDS

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

Execution

Once per driving cycle

Sequence

None

Duration

31 seconds or more

DTC Type

Two drive cycles, MIL ON

OBD Status

N/A

Condition

Minimum

Maximum

Low load duration time 10 seconds

Engine coolant
temperature before
EVAP purge control
starts

131 °F (55 °C)

MAP value

54 kPa (16.1 in.Hg, 410 mmHg)

Battery voltage

10.5 V

EVAP canister purge
valve Duty

30 %

80 %

Fuel trim

0.69

1.47

Fuel feedback

Closed loop at stoichiometric

No active DTCs

P0101, P0102, P0103, P0107, P0108, P0117, P0118, P0134, P0135, P0300,
P0301, P0302, P0303, P0304, P0335, P0339, P0443, P0451, P0452, P0453,
P0496, P0498, P0499, P1128, P1129, P1157, P1172, P1454, P2195, P2227,
P2228, P2229, P2238, P2252, P2422

2007 Honda Element EX

2007 ENGINE PERFORMANCE Advanced Diagnostics - Element

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