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Acura RL. Manual - part 22

Malfunction Threshold

The ratio of the current EGR flow to the normal EGR flow is 15% or less.

Confirmation Procedure with the HDS

Do the EGR TEST in the INSPECTION MENU with the HDS.

Driving Pattern

Fig. 60: Vehicle Speed Driving Pattern

1. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the

radiator fan comes on.

2. Drive the vehicle at a speed between 15 - 75 mph (24 - 120 km/h) for at least 5 seconds.

3. Then, drive at a steady speed between 55 - 75 mph (88 - 120 km/h) for at least 10 seconds.

4. Decelerate with the throttle valve fully closed for at least 4 seconds.



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

Diagnosis Details

Battery voltage

10.5 V

Throttle position

Fully closed

Fuel feedback

During deceleration

No active DTCs

P0107, P0108, P0112, P0113, P0117, P0118, P0122, P0123,
P0134, P0135, P0154, P0155, P0222, P0223, P0335, P0339,
P0404, P0406, P0443, P0496, P0506, P0507, P1077, P1078,
P1109, P1128, P1129, P1172, P1174, P2101, P2108, P2118,
P2122, P2123, P2127, P2128, P2135, P2138, P2176, P2195,
P2197, P2227, P2228, P2229, P2237, P2238, P2240, P2241,
P2243, P2245, P2247, P2249, P2251, P2252, P2254, P2255,
P2279, P2413, P2627, P2628, P2630, P2631, P2646, P2647,
P2648, P2649, U0107

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics - RL

Friday, June 05, 2009 2:32:03 PM

Page 85

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 P0404 (12): ADVANCED DIAGNOSTICS

DTC P0404: EXHAUST GAS RECIRCULATION (EGR) CONTROL CIRCUIT
RANGE/PERFORMANCE PROBLEM

Fig. 61: Exhaust Gas Recirculation Valve Lift Graph

General Description

The exhaust gas recirculation (EGR) valve, which is controlled by the powertrain control module (PCM), is
opened and the exhaust gas flows from the exhaust manifold through the EGR valve and the intake manifold
and the EGR passage. The exhaust gas is circulated into the air/fuel mixture and the mixture is drawn into
the combustion chamber to lower combustion temperatures, thus reducing oxides of nitrogen (NOx)
emissions.

A sensor (lift sensor) is built into the EGR valve and detects the amount of valve lift. The command value
for the target valve lift is stored in the PCM so that exhaust gas recirculation can be optimized according to
driving conditions.

Comparing this command value with the lift sensor output signal value, the PCM controls the EGR valve to
make the amount of actual valve lift equal to the command value.

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics - RL

Friday, June 05, 2009 2:32:03 PM

Page 86

If the lift sensor output (actual valve lift) is greater than the commanded valve lift, an abnormality in the
EGR valve or the lift sensor output is determined.

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

MONITOR DESCRIPTION CHART

Enable Conditions

ENABLE CONDITIONS

Malfunction Threshold

The difference between the command value of the amount of EGR valve lift in the PCM and the actual
amount of valve lift is 0.041 in. (1.020 mm) or more for at least 5 seconds.

Confirmation Procedure with the HDS

Do the EGR TEST in the INSPECTION MENU with the HDS.

Driving Pattern

1. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the

radiator fan comes on.

2. Drive the vehicle at a speed between 15 - 75 mph (24 - 120 km/h) for at least 5 seconds.



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

Diagnosis Details

Conditions for illuminating the MIL

Execution

Once per driving cycle

Sequence

None

Duration

5 seconds or more

DTC Type

Two drive cycles, MIL ON

OBD Status

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

Condition

Minimum

Maximum

Engine speed

4,600 rpm

Battery voltage 10.5 V

Commanded
EGR valve lift

0.012 in. (0.3 mm)

No active DTCs

P0107, P0108, P0112, P0113, P0117, P0118, P0134, P0135, P0154, P0155, P0335,
P0339, P0401, P0406, P1128, P1129, P1172, P1174, P2195, P2197, P2237, P2238,
P2240, P2241, P2243, P2245, P2247, P2249, P2251, P2252, P2254, P2255, P2627,
P2628, P2630, P2631

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics - RL

Friday, June 05, 2009 2:32:03 PM

Page 87

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 P0406 (12): ADVANCED DIAGNOSTICS

DTC P0406: EXHAUST GAS RECIRCULATION (EGR) VALVE POSITION SENSOR CIRCUIT
HIGH VOLTAGE

Fig. 62: Exhaust Gas Recirculation Valve Position Sensor (High Voltage) - Circuit Diagram

General Description

The exhaust gas recirculation (EGR) system reduces oxides of nitrogen (NOx). NOx is generated by high
combustion temperatures. The EGR system lowers peak combustion temperature by recirculating exhaust
gas into the air/fuel mixture, thus reducing NOx emissions. The amount of exhaust gas recirculated is
dependent on the driving conditions; a command value (the amount of valve lift) is stored in the powertrain
control module (PCM) for each condition. The EGR valve position sensor indicates the amount of valve lift,
and the PCM controls the EGR valve so that the amount of actual valve lift equals the command value.

If the EGR valve position sensor output signal voltage is not within a specified value, a malfunction is
detected and a DTC is stored.

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

MONITOR DESCRIPTION CHART

Enable Conditions

Execution

Continuous

Sequence

None

Duration

2 seconds or more

DTC Type

One drive cycle, MIL ON

OBD Status

N/A

2007 Acura RL

2007 ENGINE PERFORMANCE Advanced Diagnostics - RL

Friday, June 05, 2009 2:32:03 PM

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