Acura RL. Instruction — page 83

Enable Conditions

ENABLE CONDITIONS

Malfunction Threshold

Either condition must be met for at least 0.7 seconds.

The registration of the throttle valve fully closed position is not completed within a predetermined
time after the ignition switch is turned ON.

The registered value of the throttle valve fully closed position is 0.74 V

*1

, 1.61 V

*2

or more, or 0.49

V

*1

, 1.37 V

*2

or less.

*1: TP sensor A

*2: TP sensor B

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 P2183 (192): ADVANCED DIAGNOSTICS

DTC P2183: ENGINE COOLANT TEMPERATURE (ECT) SENSOR 2 CIRCUIT
RANGE/PERFORMANCE PROBLEM

Duration

0.7 seconds or more

DTC Type

One drive cycle, MIL ON

OBD Status

N/A

Condition

Minimum

Maximum

Battery voltage

6.0 V

Ignition switch

ON

No active DTCs

P0122, P0123, P0222, P0223, P2101, P2108, P2118, P2135, U0107

Other

Engine is stopped and ignition switch is not in the ON position

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

me

Friday, June 05, 2009 2:32:07 PM

Page 329 © 2005 Mitchell Repair Information Company, LLC.

Fig. 267: Engine Coolant Temperature Sensor 2 Circuit Performance Graph

General Description

Two engine coolant temperature sensors and one intake air temperature sensor are used by the powertrain
control module (PCM).

When the engine is stopped and enough time has passed, the temperature of the engine will equal the
ambient temperature. When an inappropriate temperature is detected after comparing the temperature
readings of each sensor, a malfunction in the corresponding sensor is detected 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

10 seconds or more

DTC Type

Two drive cycles, MIL ON

OBD Status

N/A

Condition

Minimum

Maximum

Engine off time 6 hours

No active DTCs P0111, P0112, P0113, P0116, P0117, P0118, P0125, P1116, P2184, P2185, P2610

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

me

Friday, June 05, 2009 2:32:07 PM

Page 330 © 2005 Mitchell Repair Information Company, LLC.

Malfunction Threshold

A malfunction is detected if these three conditions are not present after the engine and the ignition switch
have been off for at least 6 hours before restarting the engine.

The temperature (IAT minus ECT1) is not 57°F (32°C) or less.

The temperature (IAT minus ECT2) is not 28°F (16°C) or less.

The temperature (ECT2 minus ECT1) is not 45°F (25°C) or less.

Driving Pattern

1. Turn the ignition off, and wait at least 6 hours.

2. Start the engine, and let it idle for at least 10 seconds.

Diagnosis Details

Conditions for illuminating the MIL

When a malfunction is detected during the first drive cycle, a Temporary DTC is stored in the PCM
memory. If the malfunction recurs during the next (second) drive cycle, 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 P2184 (192): ADVANCED DIAGNOSTICS

DTC P2184: ENGINE COOLANT TEMPERATURE (ECT) SENSOR 2 CIRCUIT LOW VOLTAGE

Fig. 268: Engine Coolant Temperature Sensor 2 (Low Voltage) — Circuit Diagram

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

me

Friday, June 05, 2009 2:32:07 PM

Page 331 © 2005 Mitchell Repair Information Company, LLC.

Fig. 269: Engine Coolant Temperature Sensor 2 Output Voltage Graph

General Description

Engine coolant temperature (ECT) sensor 2 is a thermistor attached to the radiator side of the coolant
manifold. The powertrain control module (PCM) applies voltage (about 5 V) to the ECT2 signal circuit
through a pull-up resistor. As the engine coolant temperature cools, ECT sensor 2 resistance increases, and
the PCM detects a high signal voltage. As the engine coolant warms, sensor resistance decreases, and the
PCM detects a low ECT2 signal voltage.

If the ECT sensor 2 output voltage is less than a set value when the engine coolant temperature is high, 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 output voltage from the ECT sensor 2 is 0.08 V or less for at least 2 seconds.

Diagnosis Details

Execution

Continuous

Sequence

None

Duration

2 seconds or more

DTC Type

One drive cycle, MIL ON

OBD Status

N/A

Condition

Ignition switch

ON

No active DTCs

P2185

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

me

Friday, June 05, 2009 2:32:07 PM

Page 332 © 2005 Mitchell Repair Information Company, LLC.

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