Acura RL. Manual - part 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 

 

2007 Acura RL 

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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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

 

2007 Acura RL 

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

  

me 

 

Friday, June 05, 2009 2:32:03 PM

Page 68 

© 2005 Mitchell Repair Information Company, LLC.