Acura RL. Instruction — page 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

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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

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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

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