Acura RL. Manual - part 4

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 P0118 (6): ADVANCED DIAGNOSTICS

DTC P0118: ENGINE COOLANT TEMPERATURE (ECT) SENSOR 1 CIRCUIT HIGH
VOLTAGE

Fig. 13: Engine Coolant Temperature (ECT) Sensor 1 (High Voltage) - Circuit Diagram

Fig. 14: Engine Coolant Temperature (ECT) Sensor 1 Output Voltage Graph

General Description

The engine coolant temperature (ECT) sensor 1 is used for air/fuel ratio feedback control, ignition timing

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics - RL

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

Page 13

control, idle speed control, and other functions. The ECT sensor 1 resistance varies depending on the engine
coolant temperature. As the engine coolant cools, the ECT sensor 1 resistance increases, and the powertrain
control module (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 is a set
value or more when the engine coolant temperature is low, 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

Malfunction Threshold

The ECT sensor 1 output voltage is 4.92 V or more for at least 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 P0122 (7): ADVANCED DIAGNOSTICS

DTC P0122: THROTTLE POSITION (TP) SENSOR A CIRCUIT LOW VOLTAGE

Execution

Continuous

Sequence

None

Duration

2 seconds or more

DTC Type

One drive cycle, MIL ON

OBD Status

N/A

Condition

Ignition switch

No active DTCs

P0117

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics - RL

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

Page 14

Fig. 15: Throttle Position (TP) Sensor A (Low 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 less than the fixed value for a set period of time, the throttle actuator

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics - RL

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

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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 0.3 V or less 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 P0123 (7): ADVANCED DIAGNOSTICS

DTC P0123: THROTTLE POSITION (TP) SENSOR A CIRCUIT HIGH VOLTAGE

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

P0123, P2101, P2108, P2118, P2135, P2176, U0107

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics - RL

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

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