Engine Control System / Engine Mechanical - Testing & Troubleshooting

• Connector View
  • PCM Connector for Inputs and Outputs (2017 2018 2019)
  • PCM Connector for Inputs and Outputs (2020 2021 2022 2023 2024 2025)
• Learning Reset Clear
  • CKP Pattern Clear/CKP Pattern Learn Procedure
    • Procedure
  • PCM Idle Learn Procedure
    • Procedure
  • PCM Reset (PGM-FI System)
    • Procedure
• Check
  • Throttle Body Carbon Accumulation Check
    • Test
• Repair Procedures And Tests
  • Liquid Gasket Applying Procedure
    • Procedure
  • Rocker Arm and Shaft Disassembly, Reassembly, and Inspection
    • Disassembly and Reassembly
    • Inspection
  • Throttle Body Cleaning
    • Cleaning
• General Information
  • Engine Configuration
  • How to Set Readiness Codes
    • Malfunction Indicator Lamp (MIL) Indication (In relation to Readiness Codes)
    • Catalytic Converter Monitor and Readiness Code
    • Evaporative Emission (EVAP) Control System Monitor and Readiness Code
    • Air Fuel Ratio (A/F) Sensor Monitor and Readiness Code
    • Air Fuel Ratio (A/F) Sensor Heater Monitor Readiness Code
    • Misfire Monitor and Readiness Code
    • Fuel System Monitor and Readiness Code
    • Comprehensive Component Monitor and Readiness Code
    • EGR Monitor and Readiness Code
• Inspection
  • APP Sensor Signal Inspection
    • Inspection
  • Auto Idle Stop System Inspection (With Auto Idle Stop System) (2020 2021 2022 2023 2024 2025)
  • Block and Piston Inspection
    • Inspection
  • Camshaft Timing Inspection
    • Inspection
  • Catalytic Converter Inspection
    • Inspection
  • Connecting Rod and Crankshaft End Play Inspection
    • Inspection
  • Engine Compression Inspection
    • Inspection
  • Engine Oil Jet Bolt Inspection
    • Inspection
  • Idle Speed Inspection (2017 2018 2019)
    • Inspection
  • Idle Speed Inspection (2020 2021 2022 2023 2024 2025)
    • Inspection
  • PCV Valve Inspection
    • Inspection
  • Valve Inspection
    • Inspection
  • Valve Stem-to-Guide Clearance Inspection
    • Inspection
• Rewrite
  • PCM Update
    • Procedure
• Component Location Index
  • Engine Block Assembly Component Location Index
  • Intake Air System and Exhaust System Component Location Index
• Repair Regeneration
  • Cylinder Bore Honing
    • Honing
  • Valve Seat Reconditioning
    • Reconditioning
• Symptom Troubleshooting
  • Auto Idle Stop System Symptom Troubleshooting - Auto idle stop system does not operate (With Auto Idle Stop System) (2020 2021 2022 2023)
  • Auto Idle Stop System Symptom Troubleshooting - Auto idle stop system does not operate (With Auto Idle Stop System) (2024 2025)
  • Auto Idle Stop System Symptom Troubleshooting - Auto idle stop system indicator (amber) blinks (With Auto Idle Stop System) (2020 2021 2022 2023)
  • Auto Idle Stop System Symptom Troubleshooting - Auto idle stop system indicator (green/amber) does not come on (With Auto Idle Stop System) (2020 2021 2022 2023)
  • Auto Idle Stop System Symptom Troubleshooting - Starter System Counter Inspection(With Auto Idle Stop System) (2022 2023)
  • Auto Idle Stop System Symptom Troubleshooting - Starter System Counter Inspection(With Auto Idle Stop System) (2024 2025)
• Symptom Troubleshooting Index
  • Auto Idle Stop System Symptom Troubleshooting Index (With Auto Idle Stop System) (2020 2021)
  • Auto Idle Stop System Symptom Troubleshooting Index (With Auto Idle Stop System) (2022 2023 2024 2025)
• Removal & Installation Inspection
  • Air Cleaner Element Removal, Installation, and Inspection
    • Removal and Installation
    • Inspection
  • Camshaft Removal, Installation, and Inspection (2017 2018 2019)
    • Removal
      • Front
      • Rear
    • Installation
      • Notes
      • Front
      • Rear
    • Inspection
  • Camshaft Removal, Installation, and Inspection (2020 2021 2022 2023 2024 2025)
    • Removal
      • Front
      • Rear
    • Installation
      • Notes
      • Front
      • Rear
    • Inspection
  • Crankshaft and CKP Pulse Plate Removal, Installation, and Inspection
    • Removal
    • Installation
    • Inspection
• Adjustment
  • Valve Clearance Adjustment
    • Adjustment
• Description & Operation
  • Auto Idle Stop System Description - Operation Conditions (With Auto Idle Stop System) (2020 2021 2022 2023 2024 2025)
  • Auto Idle Stop System Description (With Auto Idle Stop System) (2020 2021 2022 2023 2024 2025)
  • Catalytic Converter System Description
  • EGR System Description
  • EVAP System Description
  • Electronic Throttle Control System Description
  • PCV System Description
  • PGM-FI System Description
  • PGM-FI System Description - Components
  • PGM-FI System Description - On-Board Snapshot
  • VTEC/Variable Cylinder Management (VCM) System Description
• Replacement
  • Camshaft Oil Seal Replacement - In Car
    • Notes
    • Replacement
  • Connecting Rod Bearing Replacement
    • Replacement
  • Crankshaft Main Bearing Replacement
    • Replacement
  • Pulley End Crankshaft Oil Seal Replacement - In Car
    • Notes
    • Replacement
  • Valve Guide Replacement
    • Notes
    • Replacement
• Symptom Troubleshooting Index for Viewer
  • After warming up, idle speed is above specifications without load (MIL works OK, no DTCs set)
  • After warming up, idle speed is below specifications without load (MIL works OK, no DTCs set)
  • Auto idle stop system does not operate (With Auto Idle Stop System) (2020 2021)
  • Auto idle stop system does not operate (With Auto Idle Stop System) (2022 2023 2024 2025)
  • Auto idle stop system indicator (amber) blinks (With Auto Idle Stop System) (2020 2021 2022 2023)
  • Auto idle stop system indicator (green/amber) does not come on(With Auto Idle Stop System) (2020 2021)
  • Auto idle stop system indicator (green/amber) does not come on (With Auto Idle Stop System) (2022 2023 2024 2025)
  • Cold fast idle too high (MIL works OK, no DTCs set)
  • Cold fast idle too low (MIL works OK, no DTCs set)
  • Difficult to refuel (MIL works OK, no DTCs set)
  • Engine is hard to start (MIL works OK, no DTCs set)
  • Engine stalls (MIL works OK, no DTCs set)
  • Engine starts but stalls immediately (MIL works OK, no DTCs set, immobilizer indicator stays on or flashes)
  • Engine will not start (MIL works OK, no DTCs set)
  • Engine will not start (MIL works OK, no DTCs set, immobilizer indicator stays on or flashes)
  • Engine will not start and HDS does not communicate with the PCM (MIL comes on and stays on, no DTCs set)
  • HDS does not communicate with the PCM or the vehicle
  • Idle speed fluctuates (MIL works OK, no DTCs set)
  • Idle stop time is short (With Auto Idle Stop System) (2020 2021)
  • Idle stop time is short (With Auto Idle Stop System) (2022 2023 2024 2025)
  • Low power (MIL works OK, no DTCs set)
  • MIL comes on and stays on, or never comes on at all, no DTCs set
• Test
  • Variable Cylinder Management Rocker Arm Test
    • Notes
    • Test
• Troubleshooting
  • A/C Signal Circuit Troubleshooting (2017 2018 2019)
  • MIL Circuit Troubleshooting (2017 2018 2019)
  • MIL Circuit Troubleshooting (2020 2021 2022 2023)
  • PCM Power and Ground Circuit Troubleshooting (2017 2018 2019)
  • PCM Power and Ground Circuit Troubleshooting (2020 2021 2022 2023)
• How to Information
  • How to Connect the HDS