Acura RL. Manual - part 37

Fig. 104: ATF Temperature Sensor Operation Diagram

General Description

The ATF temperature sensor is a thermistor type sensor whose resistance changes according to the change in
ATF temperature. The powertrain control module (PCM) sends a 5 V reference voltage to the grounded
sensor through a pull-up resistor. When the ATF temperature is low, the sensor resistance increases and the
PCM detects a high signal voltage. As the ATF temperature rises, the sensor resistance decreases and the
PCM detects a low signal voltage.

If the ATF temperature sensor signal does not change, the PCM detects a malfunction and a DTC is stored.

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

MONITOR DESCRIPTION CHART

Execution

Once per driving cycle

Sequence

None

Duration

5 minutes or more

(1)

20 seconds or more

(2)

DTC Type

One drive cycle, MIL OFF, D indicator blinks

OBD Status

PASSED/FAILED/NOT COMPLETED (STILL TESTING)

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics - RL

Friday, June 05, 2009 2:32:04 PM

Enable Conditions

1. Stuck at Low temperature

ENABLE CONDITIONS

2. Stuck at High temperature

ENABLE CONDITIONS

Malfunction Threshold

1. Stuck at Low temperature

The ATF temperature rise is 9°F (5°C) or less after the ignition switch is turned ON, and the current
ATF temperature is -4°F (-20°C) or less for at least 5 minutes.

2. Stuck at High temperature

The ATF temperature drop is -9°F (-5°C) or less after the ignition switch is turned OFF, and the
current ATF temperature is 230°F (110°C) or more for at least 20 seconds.

(1)

Stuck at Low temperature is detected

(2)

Stuck at High temperature is detected

Condition

Minimum

Maximum

Battery voltage

11.0 V

ATF temperature

-4°F (-20°C)

Initial engine coolant
temperature

95°F (35°C)

Engine coolant temperature

158°F (70°C)

Throttle position

4.0 °

Vehicle speed

19 mph (30 km/h)

No active DTCs

P0116, P0117, P0118, P0712, P0713, P0721, P0722

Other

After the engine coolant temperature reaches the fixed value, both
the vehicle speed and the throttle position meet the conditions for
at least 5 minutes

Condition

Minimum

Maximum

Battery voltage

11.0 V

ATF temperature

230°F (110°C)

Previous engine coolant
temperature when the ignition
switch was turned OFF

158°F (70°C)

Present engine coolant
temperature when the ignition
switch is turned ON

95°F (35°C)

Engine coolant temperature

158°F (70°C)

No active DTCs

P0116, P0117, P0118, P0712, P0713, P0721, P0722

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics - RL

Friday, June 05, 2009 2:32:04 PM

Driving Pattern

1. Stuck at Low temperature

Start the engine with engine coolant temperature at 95°F (35°C) or less, and warm up the engine until
the engine coolant temperature reaches 158°F (70°C) or more. Then drive the vehicle at a speed of 19
mph (30 km/h) or more with the throttle position at 4.0° or more for at least 5 minutes.

2. Stuck at High temperature

Turn off the engine with the engine coolant temperature at 158°F (70°C) or more. Restart the engine
after the engine coolant temperature drops to 95°F (35°C) or less, and warm up the engine until the
engine coolant temperature reaches 158°F (70°C), and wait for at least 20 seconds.



Drive the vehicle in this manner only if the traffic regulations and ambient conditions allow.

Diagnosis Details

Conditions for illuminating the indicator

When a malfunction is detected, the D indicator blinks, and the DTC and the freeze frame data are stored in
the PCM memory. The MIL does not come on.

Conditions for clearing the DTC

The DTC and the freeze frame data can be cleared by using the scan tool Clear command or by
disconnecting the battery.

DTC P0712 (28): ADVANCED DIAGNOSTICS

DTC P0712: SHORT IN ATF TEMPERATURE SENSOR CIRCUIT

Fig. 105: ATF Temperature Sensor Circuit Diagram

General Description

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics - RL

Friday, June 05, 2009 2:32:04 PM

PCM detects a low signal voltage.

When the ATF temperature sensor signal voltage to the PCM is under the specification, indicating that the
temperature is above the specification (a short to ground), a malfunction is detected and a DTC is stored.

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

MONITOR DESCRIPTION CHART

Enable Conditions

ENABLE CONDITIONS

Malfunction Threshold

The ATF temperature sensor output voltage is less than 0.07 V for at least 10 seconds.

Driving Pattern

Start the engine, shift to the P position, and wait for at least 10 seconds.

Diagnosis Details

Conditions for illuminating the indicator

When a malfunction is detected, the D indicator blinks, and the DTC and the freeze frame data are stored in
the PCM memory. The MIL does not come on.

Conditions for clearing the DTC

The DTC and the freeze frame data can be cleared by using the scan tool Clear command or by
disconnecting the battery.

DTC P0713 (28): ADVANCED DIAGNOSTICS

DTC P0713: OPEN IN ATF TEMPERATURE SENSOR CIRCUIT

Execution

Continuous

Sequence

None

Duration

10 seconds or more

DTC Type

One drive cycle, MIL OFF, D indicator blinks

OBD Status

PASSED/FAILED/NOT COMPLETED (STILL TESTING)

Condition

Minimum

Maximum

Battery voltage

11.0 V

No active DTCs

P0711, P0713

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics - RL

Friday, June 05, 2009 2:32:04 PM

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