Acura RL. Instruction — page 71

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

MONITOR DESCRIPTION CHART

Enable Conditions

ENABLE CONDITIONS

Malfunction Threshold

The ELD output voltage is 4.56 V or more for at least 5 seconds.

Diagnosis Details

Conditions for illuminating the indicator

When a malfunction is detected, the DTC and the freeze frame data are stored in the PCM memory. The
MIL does not come on.

Conditions for clearing the DTC

The DTC and the freeze frame data can be cleared by using the scan tool Clear command or by
disconnecting the battery.

DTC P1454 (91): ADVANCED DIAGNOSTICS

DTC P1454: FUEL TANK PRESSURE (FTP) SENSOR CIRCUIT RANGE/PERFORMANCE
PROBLEM

Execution

Continuous

Sequence

None

Duration

5 seconds or more

DTC Type

One drive cycle, MIL OFF

OBD Status

N/A

Condition

Minimum

Maximum

Battery voltage

10.0 V

Ignition switch

ON

No active DTCs

P1297

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

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Friday, June 05, 2009 2:32:06 PM

Page 281 © 2005 Mitchell Repair Information Company, LLC.

Fig. 235: FTP Sensor Output After Starting Engine

Fig. 236: Malfunction Judgment Flowchart 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 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 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 PCM stores both DTCs.

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

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Friday, June 05, 2009 2:32:06 PM

Page 282 © 2005 Mitchell Repair Information Company, LLC.

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

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

Malfunction Threshold

One of these conditions is met.

The FTP sensor output fluctuates by 0.6 kPa (0.1 in.Hg, 5 mmHg) or more, or -0.6 kPa (-0.1 in.Hg, -5
mmHg) or less for at least 3 seconds.

The FTP sensor output value is -1.3 kPa (-0.3 in.Hg, -10 mmHg) or less for at least 3 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

Execution

One 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

10 seconds

Elapsed time
after stopping
the purge control

5 seconds

No active DTCs

P0107, P0108, P0116, P0117, P0118, P0125, P0134, P0135, P0154, P0155, P0335,
P0339, P0443, P0451, P0452, P0453, P0496, P0498, P0499, P1109, P1116, P1128,
P1129, P1172, P1174, P2195, P2197, P2227, P2228, P2229, P2237, P2238, P2240,
P2241, P2243, P2245, P2247, P2249, P2251, P2252, P2254, P2255, P2422, P2627,
P2628, P2630, P2631

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

me

Friday, June 05, 2009 2:32:06 PM

Page 283 © 2005 Mitchell Repair Information Company, LLC.

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 P1549 (34): ADVANCED DIAGNOSTICS

DTC P1549: CHARGING SYSTEM HIGH VOLTAGE

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

me

Friday, June 05, 2009 2:32:06 PM

Page 284 © 2005 Mitchell Repair Information Company, LLC.

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