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Acura RL. Manual - part 24

Malfunction Threshold

The number of detections is 592 (CTAGLT68) or more.

Driving Pattern

Fig. 66: Vehicle Speed Driving Pattern

1. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the

radiator fan comes on.

2. Drive the vehicle at a speed between 45 - 75 mph (73 - 120 km/h) for at least 5 minutes, to warm up

the TWC.

3. Set a vehicle speed of 55 mph (88 km/h) on the cruise control, and drive for at least 1 minute.



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

Diagnosis Details

Conditions for illuminating the MIL

Estimated TWC temperature

932°F (500°C)

Engine speed

1,250 rpm

2,200 rpm

MAP value

22 kPa (6.3 in.Hg, 160 mmHg)

69 kPa (20.4 in.Hg, 520 mmHg)

Vehicle speed

4 mph (5 km/h)

Fuel trim

0.73

1.47

Fuel feedback

Closed loop

Monitoring priority

P0456, P0457, P0497

No active DTCs

P0107, P0108, P0112, P0113, P0117, P0118, P0153, P0154,
P0155, P0157, P0158, P0159, P0161, P0174, P0175, P0300,
P0301, P0302, P0303, P0304, P0305, P0306, P0335, P0339,
P0340, P0344, P0401, P0404, P0443, P0496, P0627, P1077,
P1078, P1109, P1128, P1129, P1174, P2197, P2227, P2228,
P2229, P2240, P2241, P2247, P2249, P2254, P2255, P2272,
P2273, P2413, P2630, P2631, P2646, P2647, P2648, P2649,
P2A03

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics - RL

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

Page 93

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 P0443 (92): ADVANCED DIAGNOSTICS

DTC P0443: EVAPORATIVE EMISSION (EVAP) CANISTER PURGE VALVE CIRCUIT
MALFUNCTION

Fig. 67: Evaporative Emission Canister Purge Valve Circuit Diagram

General Description

The evaporative emission (EVAP) canister purge valve is attached to the vacuum port between the EVAP
canister and the intake manifold.

The powertrain control module (PCM) does not turn on the EVAP canister purge valve when the engine
coolant temperature is 149 °F (65 °C) or less.

The PCM adjusts the amount of fuel vapor sent to the engine by controlling the EVAP canister purge valve
duty cycle.

When the return signal does not change according to the EVAP canister purge valve duty cycle for a set
period of time, the PCM detects a malfunction, and a DTC is stored.

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics - RL

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

Page 94

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

MONITOR DESCRIPTION CHART

Enable Conditions

ENABLE CONDITIONS

Malfunction Threshold

The return signal does not change according to the EVAP canister purge valve output for at least 5 seconds.

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.

DTC P0451 (91): ADVANCED DIAGNOSTICS

DTC P0451: FUEL TANK PRESSURE (FTP) SENSOR CIRCUIT RANGE/PERFORMANCE
PROBLEM

Execution

Continuous

Sequence

None

Duration

5 seconds or more

DTC Type

One drive cycle, MIL ON

OBD Status

PASSED/FAILED/NOT COMPLETED (STILL TESTING)

Condition

Minimum

Maximum

Battery voltage

10.1 V

EVAP canister purge valve output duty

2 %

98 %

State of the engine

Running

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics - RL

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

Page 95

Fig. 68: Fuel Tank Pressure Sensor Circuit Diagram

Fig. 69: Fuel Tank Pressure Sensor Output Voltage Graph

Fig. 70: Fuel Tank Pressure Sensor Normal Operation And System Failure 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 powertrain control module (PCM) monitors the FTP

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics - RL

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

Page 96

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