Acura RL. Instruction — page 17

Fig. 46: Throttle Position (TP) Sensor B (High Voltage) — Circuit Diagram

General Description

Throttle position (TP) sensor B is a semiconductor type, and it is attached to the throttle body and shaft to
determine throttle valve position.

The throttle valve position signal from TP sensor B is transmitted to the throttle actuator control module for
target position feedback control, then to the powertrain control module (PCM) as an actual throttle valve
position signal.

If the signal from TP sensor B is more than the fixed value for a set time, the throttle actuator control

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2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

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module detects a malfunction and sends the malfunction data to the PCM. When the PCM receives the
malfunction data from the throttle actuator control module, the PCM detects a TP sensor B malfunction and
stores a DTC.

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

MONITOR DESCRIPTION CHART

Enable Conditions

ENABLE CONDITIONS

Malfunction Threshold

The TP sensor B output voltage is 4.8 V or more for at least 0.2 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 P0300 (77): ADVANCED DIAGNOSTICS

DTC P0300: RANDOM MISFIRE DETECTED

Execution

Continuous

Sequence

None

Duration

0.2 seconds or more

DTC Type

One drive cycle, MIL ON

OBD Status

N/A

Condition

State of the engine

Running

No active DTCs

P0222, P2101, P2108, P2118, P2135, P2176, U0107

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2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

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Fig. 47: Crankshaft Position Sensor Pulse Data

General Description

The crankshaft vibrates slightly when each cylinder fires. If a misfire occurs, the crankshaft rotation speed
changes rapidly. The powertrain control module (PCM) monitors the crankshaft rotation speed based on the
output pulses from the crankshaft position (CKP) sensor. By monitoring changes in the crankshaft rotation
speed, the PCM counts the number of misfires and determines which cylinder is misfiring. If more than one
DTC from P0301 through P0306 has been stored while misfires in multiple cylinders are detected, a
malfunction is detected and a DTC is stored.

There are two types of misfire detection.

Type 1 (1 drive cycle): When the number of misfires per 200 engine revolutions reaches the level that
damages the three way catalyst (TWC), a DTC is stored and the MIL blinks. When the misfire ceases, the
MIL remains on steady instead of blinking.

Type 2 (2 drive cycles): When the number of misfires per 1,000 engine revolutions reaches the level that
affects FTP mode exhaust emissions, a DTC is stored and the MIL comes on.

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

MONITOR DESCRIPTION CHART

Enable Conditions

ENABLE CONDITIONS

Execution

Continuous

Sequence

None

Duration

Type 1 Every 200 rpm
Type 2 Every 1,000 rpm

DTC Type

Two drive cycles, MIL ON

OBD Status

PASSED/FAILED/EXECUTING/OUT OF (TEST) CONDITION

Condition

Minimum

Maximum

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2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

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Malfunction Threshold

The number of misfires versus engine revolutions is equal to or greater than the values in the table.

MALFUNCTION THRESHOLD

Driving Pattern

Fig. 48: Vehicle Speed Driving Pattern

Engine coolant temperature

14°F (-10°C)

(1)

68°F (20°C)

(2)

Engine speed

500 rpm

6,800 rpm

MAP value

(3)

500 rpm

23 kPa (6.7 in.Hg, 170
mmHg)

2,000 rpm

22 kPa (6.5 in.Hg, 165
mmHg)

Fuel feedback

Other than during fuel cut-off operation

No active DTCs

P0107, P0108, P0117, P0118, P0122, P0123,
P0222, P0223, P0335, P0339, P0385, P0389,
P1109, P1128, P1129, P2227, P2228, P2229

Other

Test-drive on a flat road to avoid misdetection

(1)

When starting the engine at an engine coolant temperature of 14°F (-10°C) or less.

(2)

When starting the engine at an engine coolant temperature of more than 14°F (-10°C).

(3)

Varies with driving conditions.

Misfire Type

The number of engine revolutions

The number of misfires

Misfire Type 1 (Severe)

Per 200 revolutions

26 — 89 times

(1)

Misfire Type 2 (Light)

Per 1,000 revolutions

54 times

(1)

Depending on engine speed and load.

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

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