Acura RL. Manual - part 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

  

me 

 

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.