Acura RL. Manual - part 516

Courtesy of AMERICAN HONDA MOTOR CO., INC.

'06-08 models 

Fig. 43: Identifying Multi-Information Display (06-08 Models) 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

TO MAKE THE MESSAGE GO OFF (WITH THE HDS) 

Procedure 

1. Tighten the fuel fill cap properly.  

2. Clear the Temporary DTC with the HDS.  

3. Verify there is no leak by doing the EVAP FUNCTION TEST in the INSPECTION MENU with the 

HDS.  

TO MAKE THE MESSAGE GO OFF (WITHOUT THE HDS) ('05-07 MODELS) 

Procedure 

1. Tighten the fuel fill cap until it clicks.  

2. The message should go off after several days normal driving.  

TO MAKE THE MESSAGE GO OFF (WITHOUT THE HDS) ('08 MODEL) 

Procedure 

1. Tighten the fuel fill cap until it clicks.  

2. Turn the ignition switch ON (II), then turn the ignition switch OFF.  

3. Do step 2 three times in all.  

ELECTRONIC THROTTLE CONTROL SYSTEM DIAGRAM 

The electronic throttle control system consists of the throttle actuator, throttle position (TP) sensor A/B, 
accelerator pedal position (APP) sensor A/B, the throttle actuator control module, and the PCM.

 

2007 Acura RL 

2005-08 ENGINE PERFORMANCE Fuel and Emissions Systems - RL

  

me 

 

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© 2005 Mitchell Repair Information Company, LLC. 

Fig. 44: Electronic Throttle Control System Diagram 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

INTAKE MANIFOLD TUNING (IMT) VALVE SYSTEM 

Engine power is enhanced by closing and opening the intake manifold tuning (IMT) actuator. When the 
valve is closed, there is high torque at low engine speed. When the valve is open, there is high torque at high 
engine speed. 

The intake manifold tuning (IMT) actuator has a sensor that detects the IMT valve position and sends it to 
the PCM. 

 

2007 Acura RL 

2005-08 ENGINE PERFORMANCE Fuel and Emissions Systems - RL

  

me 

 

Friday, June 05, 2009 2:33:27 PM

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© 2005 Mitchell Repair Information Company, LLC. 

Fig. 45: Identifying IMT Actuator, Magnet And Motor 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

EXHAUST GAS RECIRCULATION (EGR) SYSTEM DIAGRAM 

The EGR system reduces oxides of nitrogen (NOx) emissions by recirculating exhaust gas through the EGR 
valve and the intake manifold into the combustion chambers. The PCM memory includes the ideal EGR 
valve position for varying operating conditions. 

The EGR valve position sensor detects the amount of EGR valve lift, and sends it to the PCM. The PCM 
then compares it with the ideal lift in its memory (based on signals sent from other sensors). If there is any 
difference between the two, the PCM cuts current to the EGR valve.

 

2007 Acura RL 

2005-08 ENGINE PERFORMANCE Fuel and Emissions Systems - RL

  

me 

 

Friday, June 05, 2009 2:33:27 PM

Page 61 

© 2005 Mitchell Repair Information Company, LLC. 

Fig. 46: Exhaust Gas Recirculation (EGR) System Diagram 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

EVAPORATIVE EMISSION (EVAP) CONTROL DIAGRAM 

The EVAP controls minimize the amount of fuel vapor escaping to the atmosphere. Vapor from the fuel 
tank is temporarily stored in the EVAP canister until it can be purged from the canister into the engine and 
burned. 



The EVAP canister is purged by drawing fresh air through it and into a port on the intake manifold. 

The purging vacuum is controlled by the EVAP canister purge valve, which operates whenever engine 
coolant temperature is above 140°F (60°C). 



During refueling, the fuel tank vapor control valve opens with the pressure in the fuel tank, and feeds 
the fuel vapor to the EVAP canister. 

 

2007 Acura RL 

2005-08 ENGINE PERFORMANCE Fuel and Emissions Systems - RL

  

me 

 

Friday, June 05, 2009 2:33:27 PM

Page 62 

© 2005 Mitchell Repair Information Company, LLC.