Acura RL. Instruction — page 70

Malfunction Threshold

A malfunction is detected when the rear A/F sensor (bank 1, sensor 1) output voltage is 4.7 V or more.

Driving Pattern

Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan
comes on, then let it idle.

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 P1174 (158): ADVANCED DIAGNOSTICS

DTC P1174: FRONT AIR/FUEL RATIO (A/F) SENSOR (BANK 2, SENSOR 1) CIRCUIT OUT OF
RANGE HIGH

DTCs

P0303, P0304, P0305, P0306, P0335, P0339, P0443, P0496, P0627, P1128, P1129,
P2195, 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 2:32:06 PM

Page 277 © 2005 Mitchell Repair Information Company, LLC.

Fig. 232: Front Air/Fuel Ratio (A/F) Sensor (Bank 2, Sensor 1) Output Voltage Graph

General Description

If a malfunction causes the front air/fuel sensor (bank 2, sensor 1) signal to the powertrain control module
(PCM) to deviate from the normal control area, the front air/fuel ratio (A/F) sensor becomes active after the
engine starts, but the air/fuel feed-back does not start normally and the emissions deteriorate. When the front
A/F sensor output is out of the normal area, and this condition continues after the front A/F sensor is active,
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

Execution

Continuous

Sequence

None

Duration

7 seconds or more

DTC Type

One drive cycle, MIL ON

OBD Status

PASSED/FAILED/EXECUTING/OUT OF (TEST) CONDITION

Condition

No active

P0107, P0108, P0117, P0118, P0154, P0155, P0174, P0175, P0300, P0301, P0302,

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

me

Friday, June 05, 2009 2:32:06 PM

Page 278 © 2005 Mitchell Repair Information Company, LLC.

Malfunction Threshold

A malfunction is detected when the front A/F sensor (bank 2, sensor 1) output voltage is 4.7 V or more.

Driving Pattern

Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan
comes on, then let it idle.

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 P1297 (20): ADVANCED DIAGNOSTICS

DTC P1297: ELECTRICAL LOAD DETECTOR (ELD) CIRCUIT LOW VOLTAGE

Fig. 233: Electrical Load Detector (Low Voltage) — Circuit Diagram

General Description

The electrical load detector (ELD) is built into the under-hood fuse/relay box. It monitors the current fed to
the ignition switch and sends a signal to the powertrain control module (PCM). If the ELD output voltage is
extremely low, a malfunction is detected and a DTC is stored.

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

MONITOR DESCRIPTION CHART

DTCs

P0303, P0304, P0305, P0306, P0335, P0339, P0443, P0496, P0627, P1128, P1129,
P2197, P2240, P2241, P2247, P2249, P2254, P2255, P2630, P2631

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

me

Friday, June 05, 2009 2:32:06 PM

Page 279 © 2005 Mitchell Repair Information Company, LLC.

Enable Conditions

ENABLE CONDITIONS

Malfunction Threshold

The ELD output voltage is 0.27 V or less for at least 5 seconds.

Diagnosis Details

Conditions for illuminating the indicator

When a malfunction is detected, 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 P1298 (20): ADVANCED DIAGNOSTICS

DTC P1298: ELECTRICAL LOAD DETECTOR (ELD) CIRCUIT HIGH VOLTAGE

Fig. 234: Electrical Load Detector (High Voltage) — Circuit Diagram

General Description

The electrical load detector (ELD) is built into the under-hood fuse/relay box. It monitors the current fed to
the ignition switch and sends a signal to the powertrain control module (PCM). If the ELD output voltage is
extremely high, a malfunction is detected and a DTC is stored.

Execution

Continuous

Sequence

None

Duration

5 seconds or more

DTC Type

One drive cycle, MIL OFF

OBD Status

N/A

Condition

Minimum

Maximum

Battery voltage

10.0 V

Ignition switch

ON

No active DTCs

P1298

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics — RL

me

Friday, June 05, 2009 2:32:06 PM

Page 280 © 2005 Mitchell Repair Information Company, LLC.

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