Acura RL. Manual - part 5

Fig. 16: Throttle Position (TP) Sensor A (High Voltage) - Circuit Diagram 

General Description 

Throttle position (TP) sensor A 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 A 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 A is more than the fixed value for a set period of time, the throttle actuator 

 

2007 Acura RL 

2007 ENGINE PERFORMANCE Advanced Diagnostics - RL

  

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control 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 A 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 A 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 P0125 (86): ADVANCED DIAGNOSTICS 

DTC P0125: ENGINE COOLANT TEMPERATURE (ECT) SENSOR 1 MALFUNCTION/SLOW 
RESPONSE 

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

P0122, P2101, P2108, P2118, P2135, P2176, U0107

 

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Fig. 17: Engine Coolant Temperature (ECT) Sensor 1 Malfunction Graph 

General Description 

The powertrain control module (PCM) supplies voltage to the engine coolant temperature (ECT) signal 
circuit (about 5 V) through a pull-up resistor. As the engine coolant cools, the ECT sensor 1 resistance 
increases, and the PCM detects a high signal voltage. As the engine coolant warms, the ECT sensor 1 
resistance decreases, and the PCM detects a low signal voltage. 

If the ECT sensor 1 output voltage does not reach a specified temperature at which closed-loop control for 
stoichiometric air/fuel ratio starts within a set time, depending on the initial coolant temperature after 
starting the engine, the PCM detects a malfunction and a DTC is stored. 

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

MONITOR DESCRIPTION CHART 

Enable Conditions 

ENABLE CONDITIONS 

Execution

Once per driving cycle

Sequence

None

Duration

20 minutes or less

DTC Type

Two drive cycles, MIL ON

OBD Status

PASSED/FAILED/NOT COMPLETED (STILL TESTING)

Condition

Minimum

Maximum

Initial engine coolant temperature -

10°F (-12°C)

Fuel feedback

Other than during fuel cut-off operation

No active DTCs

P0107, P0108, P0111, P0112, P0113, P0117, P0118, P0134, 
P0135, P0154, P0155, P0171, P0172, P0174, P0175, P0300, 
P0301, P0302, P0303, P0304, P0305, P0306, P0335, P0339, 
P0340, P0344, P0401, P0404, P0443, P0496, P0506, P0507, 
P0627, P1077, P1078, P1109, P1128, P1129, P1172, P1174, 
P2195, P2197, P2227, P2228, P2229, P2237, P2238, P2240, 
P2241, P2243, P2245, P2247, P2249, P2251, P2252, P2254, 
P2255, P2413, P2627, P2628, P2630, P2631, P2646, P2647, 
P2648, P2649

 

2007 Acura RL 

2007 ENGINE PERFORMANCE Advanced Diagnostics - RL

  

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Malfunction Threshold 

The engine running time before the engine coolant temperature reaches 10 °F (-12 °C), based on the initial 
engine coolant temperatures, is as follows. 

MALFUNCTION THRESHOLD 

Driving Pattern 

1. Start the engine at an initial engine coolant temperature as specified under Enable Conditions.  

2. Let the engine idle for at least 20 minutes.  

Diagnosis Details 

Conditions for illuminating the MIL 

When a malfunction is detected during the first drive cycle with the ECT and IAT at engine start-up within 
the specified temperature range, a Temporary DTC is stored in the PCM memory. If the malfunction recurs 
during the next (second) drive cycle with the ECT and IAT at engine start-up within the specified 
temperature range, 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 P0128 (87): ADVANCED DIAGNOSTICS 

DTC P0128: COOLING SYSTEM MALFUNCTION 

Initial engine coolant temperature

-24 °F (-31 °C)

10 °F (-12 °C)

Engine running time

300 seconds or more

60 seconds or more

 

2007 Acura RL 

2007 ENGINE PERFORMANCE Advanced Diagnostics - RL

  

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Friday, June 05, 2009 2:32:03 PM

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