Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSACURA20043.5RLREPAIR AND DIAGNOSISENGINE PERFORMANCETHEORY AND OPERATIONENGINE CONTROLS - THEORY & OPERATION
2004 Acura 3.5RL
Engine Controls - Theory & Operation
2004 Acura 3.5RLSECTION Engine Controls - Theory & Operation
- Introduction
- Air Induction System
- Variable Valve Timing & Lift Electronic Control System
- Computerized Engine Controls
- Powertrain Control Module
- Input Devices
- Notes
- Accelerator Pedal Position (APP) Sensor (MDX)
- A/C Pressure Switch
- Air Fuel Ratio (A/F) Sensor (MDX & RSX)
- A/T Gear Position Signal
- Generator FR (ALT FR) Signal
- Barometric Pressure (BARO) Sensor
- Battery Voltage (IGN 1)
- Brake Switch Signal
- Crankshaft Position (CKP) Sensor
- Crankshaft Speed Fluctuation (CKF) Sensor
- Cylinder Position (CYP) Sensor
- EGR Valve Position Sensor
- Electrical Load Detection (ELD)
- Engine Coolant Temperature (ECT) Sensor
- Intake Air Temperature (IAT) Sensor
- Knock Sensor (KS)
- Manifold Absolute Pressure (MAP) Sensor
- Power Steering Pressure (PSP) Switch Signal
- Primary Heated Oxygen Sensor (HO2S-1)
- Secondary Heated Oxygen Sensor (HO2S-2)
- Starter Signal
- Throttle Position (TP) Sensor
- Top Dead Center (TDC) Sensor
- Variable Valve Timing & Lift Electronic Control (VTEC) System Pressure Switch Signal
- Vehicle Speed Sensor (VSS)
- Output Signals
- Notes
- By-Pass Control Solenoid Valve(s)
- EGR Control Solenoid (EGR-SOL)
- EVAP Purge Control Solenoid Valve
- Fuel Injectors
- Fuel Pressure Regulator Control Solenoid Valve
- Heated Oxygen Sensor Heaters
- Idle Air By-Pass
- Idle Air Control (IAC) Valve
- Ignition Coil Output
- Ignition Control Module (ICM)
- Malfunction Indicator Light (MIL)
- PGM-FI Relay
- Throttle Actuator (MDX)
- Fuel System
- Ignition System
- Emission Systems
- Self-Diagnostic System
- Miscellaneous Controls
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.