Acura RL. Instruction — page 3

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 P0116 (86): ADVANCED DIAGNOSTICS

DTC P0116: ENGINE COOLANT TEMPERATURE (ECT) SENSOR 1 CIRCUIT
RANGE/PERFORMANCE PROBLEM

Fig. 10: Engine Coolant Temperature (ECT) Sensor Performance 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, ECT sensor 1 resistance
increases, and the PCM detects a high signal voltage. As the engine coolant warms, ECT sensor 1 resistance
decreases, and the PCM detects a low signal voltage.

If the ECT output voltage after driving a set time after starting the engine does not reach a set temperature,

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

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or when the difference between the ECT output voltage when driving and the output voltage of the ECT
after the engine is stopped a set time does not change a certain amount, 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

Malfunction determination 1:

With a completely cooled engine (one that has been off for at least 6 hours):

When the change in coolant temperature after 10 minutes or more of running time is 50°F (10°C) or less, a
malfunction is detected.

Malfunction determination 2:

With a partially cooled engine (one that has been off for less than 6 hours):

When the difference between the coolant temperature after 10 minutes or more of running time minus the
coolant temperature after the engine has been off for 150 minutes and then run for 10 seconds is 50°F (10°

Execution

Once per driving cycle

Sequence

None

Duration

10 minutes or more

DTC Type

Two drive cycles, MIL ON

OBD Status

N/A

Condition

Minimum

Maximum

Elapsed time
after starting
the engine

10 seconds

Fuel feedback Other than during fuel cut-off operation

No active
DTCs

P0107, P0108, 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,
P2610, P2627, P2628, P2630, P2631, P2646, P2647, P2648, P2649

Others

With a completely cooled engine (one that has been off for at least 6 hours): Judgment
is made after the engine has been run for at least 10 minutes, turned off for at least 10
seconds, then started and run again for at least 10 seconds.
With a partially cooled engine (one that has been off for less than 6 hours): Judgment
is made after the engine has been run for at least 10 minutes, turned off for at least 150
minutes then started and run again for at least 10 seconds.

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

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© 2005 Mitchell Repair Information Company, LLC.

C) or less, a malfunction is detected.

Driving Pattern

With a completely cooled engine (one that has been off for at least 6 hours).

1. Start the engine, and let it idle for at least 10 minutes.

2. Turn off the ignition for 10 seconds, then restart the engine and let it idle for at least 10 seconds.

With a partially cooled engine (one that has been off for less than 6 hours).

1. Start the engine, and let it idle for at least 10 minutes.

2. Turn off the ignition for 150 minutes, then restart 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 P0117 (6): ADVANCED DIAGNOSTICS

DTC P0117: ENGINE COOLANT TEMPERATURE (ECT) SENSOR 1 CIRCUIT LOW VOLTAGE

Fig. 11: Engine Coolant Temperature (ECT) Sensor 1 (Low Voltage) — Circuit Diagram

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

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© 2005 Mitchell Repair Information Company, LLC.

Fig. 12: Engine Coolant Temperature (ECT) Sensor 1 Output Voltage Graph

General Description

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

P0118

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

me

Friday, June 05, 2009 2:32:02 PM

Page 12

© 2005 Mitchell Repair Information Company, LLC.

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