Fuel And Emissions Systems

• Special Tools
• General Troubleshooting Information
  • Intermittent Failures
  • Service Information
  • Opens and Shorts
  • How to Use the HDS (Honda Diagnostic System)
    • If the MIL (malfunction indicator lamp) has come on
    • If the MIL did not stay on
    • If you can't duplicate the DTC
  • HDS Clear Command
  • Scan Tool Clear Command
  • DTC Clear
  • PCM Reset
  • CKP Pattern Clear/CKP Pattern Learn
    • Clear/Learn Procedure (with the HDS)
  • Learn Procedure (without the HDS)
  • How to End a Troubleshooting Session (required after any troubleshooting)
  • How to Troubleshoot Circuits at the PCM Connectors
    • Notes
    • Substituting the PCM
  • OBD Status
• DTC Troubleshooting Index
• Symptom Troubleshooting Index
• System Description
  • Fuel and Emissions System Diagram
  • Vacuum Hose Routing
  • Electronic Control Systems
    • Notes
    • Self-Diagnosis
    • Fail-Safe Function
    • MIL Bulb Check and Readiness Code Condition
    • Self Shut Down (SSD) Mode
  • PCM Inputs and Outputs at PCM Connector A (□) (49P)
  • PCM Inputs and Outputs at PCM Connector B (Δ) (49P)
  • PCM Inputs and Outputs at PCM Connector C (◦) (49P)
    • Notes
    • PCM Electrical Connections
    • PCM Circuit Diagram
  • PGM-FI System
    • Notes
    • Alternator Control
    • Air Conditioning (A/C) Compressor Clutch Relay
    • Air Fuel Ratio (A/F) Sensor
    • Barometric Pressure (BARO) Sensor
    • Camshaft Position (CMP) Sensor
    • Crankshaft Position (CKP) Sensor
    • Engine Coolant Temperature (ECT) Sensors 1 and 2
    • Ignition Timing Control
    • Injector Timing and Duration
    • Input Shaft (Mainshaft) Speed Sensor
    • Knock Sensor
    • Malfunction Indicator Lamp (MIL) Indication (In relation to Readiness Codes)
    • Manifold Absolute Pressure (MAP) Sensor
    • Mass Air Flow (MAF) Sensor/Intake Air Temperature (IAT) Sensor
    • Output Shaft (Countershaft) Speed Sensor
    • Secondary Heated Oxygen Sensor (Secondary HO2S)
  • Starter Control System Diagram
  • Electronic Throttle Control System
    • Notes
    • Accelerator Pedal Position (APP) Sensor
    • Throttle Body
  • Electronic Throttle Control System Diagram
  • VTEC
  • VTEC System Operation
    • At low engine speed
    • At high engine speed
  • Idle Control System
    • Notes
    • Brake Pedal Position Switch
    • Power Steering Pressure (PSP) Switch
  • Fuel Supply System
    • Fuel Cutoff Control
    • Fuel Pump Control
    • PGM-FI Main Relays 1 and 2
    • Transfer Fuel Pump
  • Intake Air System
    • Intake Manifold Tuning (IMT) Valve
  • Catalytic Converter System
    • Warm Up Three Way Catalytic Converter (WU-TWC) and Under-floor Three Way Catalytic Converter (TWC)
  • Exhaust Gas Recirculation (EGR) System
    • Notes
    • EGR Valve
  • Exhaust Gas Recirculation (EGR) System Diagram
  • Positive Crankcase Ventilation (PCV) System
  • Evaporative Emission (EVAP) Control System
    • Notes
    • EVAP Canister
    • EVAP Canister Purge Valve
    • Fuel Tank Pressure (FTP) Sensor
    • EVAP Canister Went Shut Valve
  • Evaporative Emission (EVAP) Control Diagram
  • Fuel Cap Warning Message
    • Notes
    • First drive cycle
  • How to clear the message with the HPS
    • Procedure
  • How to clear the message without the HDS
    • Procedure
• How to Set Readiness Codes
  • Malfunction Indicator Lamp (MIL) Indication (In relation to Readiness Codes)
  • Catalytic Converter Monitor and Readiness Code
    • Notes
    • Enable Criteria
    • Procedure
  • Evaporative Emissions (EVAP) Control System Monitor and Readiness Code
    • Notes
    • Enable Criteria
    • Procedure
  • Air Fuel Ratio (A/F) Sensor Monitor and Readiness Code
    • Notes
    • Enable Criteria
    • Procedure
  • Air Fuel Ratio (A/F) Sensor Heater Monitor Readiness Code
    • Notes
    • Procedure
  • Misfire Monitor and Readiness Code
  • Fuel System Monitor and Readiness Code
  • Comprehensive Component Monitor and Readiness Code
  • EGR Monitor and Readiness Code
    • Notes
    • Enable Criteria
    • Procedure