Acura RL. Instruction — page 84

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 P2185 (192): ADVANCED DIAGNOSTICS

DTC P2185: ENGINE COOLANT TEMPERATURE (ECT) SENSOR 2 CIRCUIT HIGH
VOLTAGE

Fig. 270: Engine Coolant Temperature Sensor 2 (High Voltage) — Circuit Diagram

Fig. 271: 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

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

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Page 333 © 2005 Mitchell Repair Information Company, LLC.

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 more than a set value 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 output voltage from the ECT sensor 2 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 P2195 (155): ADVANCED DIAGNOSTICS

DTC P2195: REAR AIR/FUEL RATIO (A/F) SENSOR (BANK 1, SENSOR 1) SIGNAL STUCK
LEAN

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

P2184

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2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

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Page 334 © 2005 Mitchell Repair Information Company, LLC.

Fig. 272: A/F Sensor Misinstalled Malfunction With Malfunction Diagnosis

General Description

When the rear air/fuel ratio (A/F) sensor (bank 1, sensor 1) is properly connected to the engine wire harness,
but it is not installed in the exhaust pipe, the A/F feedback is not performed properly even if the rear A/F
sensor is active after starting the engine. Thus, the exhaust emissions increase.

When the rear A/F sensor output stays out of the normal range after the rear A/F sensor becomes active, the
powertrain control module (PCM) detects that the rear A/F sensor is not properly installed 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

7 seconds or more

DTC Type

One drive cycle, MIL ON

OBD Status

PASSED/FAILED/NOT COMPLETED (STILL TESTING)

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

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

Page 335 © 2005 Mitchell Repair Information Company, LLC.

Malfunction Threshold

The rear A/F sensor (bank 1, sensor 1) output voltage is 3.48 V or more for at least 7 seconds.

Driving Pattern

Start the engine, then let it idle for at least 2 minutes.

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 P2197 (156): ADVANCED DIAGNOSTICS

DTC P2197: FRONT AIR/FUEL RATIO (A/F) SENSOR (BANK 2, SENSOR 1) SIGNAL STUCK
LEAN

Condition

Fuel
feedback

Other than during fuel cut-off operation

No active
DTCs

P0134, P0135, P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0627, P1172,
P2237, P2238, P2243, P2245, P2251, P2252, P2627, P2628

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

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

Page 336 © 2005 Mitchell Repair Information Company, LLC.

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