Engine Control System / Engine Mechanical - Service, Testing And Troubleshooting

• Check
  • Throttle Body Carbon Accumulation Check
    • Test
• 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
• Symptom Troubleshooting Index For Viewer
  • After warming up, idle speed is above specifications without load (MIL works OK, no DTCs set) (KA/KC)
  • After warming up, idle speed is below specifications without load (MIL works OK, no DTCs set) (KA/KC)
  • Auto idle stop system does not operate (With Auto Idle Stop System) (2018 2019 2020)
  • Auto idle stop system does not operate (With Auto Idle Stop System) (2021 2022)
  • Auto Idle Stop System Auto idle stop system does not operate (With Auto Idle Stop System) (2023 2024)
  • Auto Idle Stop System Auto idle stop system does not operate (With Auto Idle Stop System) (2025)
  • Auto idle stop system indicator (amber) blinks (With Auto Idle Stop System) (2018 2019 2020)
  • Auto idle stop system indicator (amber) blinks(With Auto Idle Stop System) (2021 2022)
  • Auto idle stop system indicator (green/amber) does not come on (With Auto Idle Stop System)
  • Auto idle stop system indicator (green/amber), auto idle stop OFF indicator, and/or auto idle stop suspend indicator does not come on (With Auto Idle Stop System)
  • Auto Idle Stop System - Starter System Counter Inspection (With Auto Idle Stop System) (2025)
  • Cold fast idle too high (MIL works OK, no DTCs set) (KA/KC) (2018 2019 2020 2021 2022 2023 2024)
  • Cold fast idle too high (MIL works OK, no DTCs set)(KA/KC) (2025)
  • Cold fast idle too low (MIL works OK, no DTCs set)(KA/KC) (2025)
  • Cold fast idle too low (MIL works OK, no DTCs set) (Without CAN Gateway) (2018 2019 2020 2021 2022 2023 2024)
  • Difficult to refuel (MIL works OK, no DTCs set) (KA/KC) (2018 2019 2020 2021 2022 2023 2024)
  • Difficult to refuel (MIL works OK, no DTCs set) (KA/KC) (2025)
  • Engine is hard to start (MIL works OK, no DTCs set) (Without CAN Gateway) (2018 2019 2020 2021 2022 2023 2024)
  • Engine is hard to start (MIL works OK, no DTCs set) (KA/KC) (2025)
  • Engine stalls (MIL works OK, no DTCs set) (Without CAN Gateway) (2018 2019 2020 2021 2022 2023 2024)
  • Engine stalls (MIL works OK, no DTCs set) (KA/KC) (2025)
  • Engine starts but stalls immediately (MIL works OK, no DTCs set, immobilizer indicator stays on or flashes) (Without CAN Gateway) (2018 2019 2020 2021 2022 2023 2024)
  • Engine starts but stalls immediately (MIL works OK, no DTCs set, immobilizer indicator stays on or flashes) (KA/KC) (2025)
  • Engine will not start (MIL works OK, no DTCs set) (KA/KC) (2018 2019 2020 2021 2022 2023 2024)
  • Engine will not start (MIL works OK, no DTCs set)(KA/KC) (2025)
  • Engine will not start (MIL works OK, no DTCs set, immobilizer indicator stays on or flashes) (Without CAN Gateway) (2018 2019 2020 2021 2022 2023 2024)
  • Engine will not start (MIL works OK, no DTCs set, immobilizer indicator stays on or flashes) (KA/KC) (2025)
  • Engine will not start and HDS does not communicate with the PCM (MIL comes on and stays on, no DTCs set) (Without CAN Gateway) (2018 2019 2020 2021 2022 2023 2024)
  • Engine will not start and HDS does not communicate with the PCM (MIL comes on and stays on, no DTCs set) (KA/KC) (2025)
  • HDS does not communicate with the PCM or the vehicle (Without CAN Gateway) (2018 2019 2020 2021 2022 2023 2024)
  • HDS does not communicate with the PCM or the vehicle (KA/KC) (2025)
  • Idle speed fluctuates (MIL works OK, no DTCs set) (KA/KC) (2018 2019 2020 2021 2022 2023 2024)
  • Idle speed fluctuates (MIL works OK, no DTCs set) (KA/KC) (2025)
  • Idle stop time is short (With Auto Idle Stop System) (2018 2019 2020)
  • Idle stop time is short (With Auto Idle Stop System) (2021 2022)
  • Idle stop time is short (With Auto Idle Stop System) (2023 2024 2025)
  • Low power (MIL works OK, no DTCs set) (KA/KC) (2018 2019 2020 2021 2022 2023 2024)
  • Low power (MIL works OK, no DTCs set) (KA/KC) (2025)
  • MIL comes on and stays on, or never comes on at all, no DTCs set (KA/KC) (2018 2019 2020 2021 2022 2023 2024)
  • MIL comes on and stays on, or never comes on at all, no DTCs set(KA/KC) (2025)
  • Starter system warning message stays on (no DTCs set) (With Auto Idle Stop System) (2023 2024 2025)
• Removal Installation Inspection
  • Catalytic Converter Removal, Installation, and Inspection
    • Removal and Installation
    • Inspection
  • PCV Valve Removal, Installation, and Inspection
    • Removal and Installation
    • Inspection
• Learning Reset Clear
  • CKP Pattern Clear/CKP Pattern Learn Procedure
    • Procedure
  • PCM Idle Learn Procedure
    • Procedure
  • PCM Reset
    • Procedure
• How To Information
  • How to Connect the HDS
• Component Location Index
  • Engine Block Assembly Component Location Index
  • Intake Air System and Exhaust System Component Location Index
• Repair Procedures And Tests
  • Liquid Gasket Applying Procedure
    • Procedure
  • Throttle Body Cleaning
    • Cleaning
• Rewrite
  • PCM Update
    • Procedure
• Description & Operation
  • Auto Idle Stop System Description (2018 2019 2020)
  • Auto Idle Stop System Description (2021 2022)
  • Auto Idle Stop System Description (With Auto Idle Stop System) (2023 2024 2025)
  • Auto Idle Stop System Description - Operation Conditions (With Auto Idle Stop System) (2023 2024)
  • Auto Idle Stop System Description - Operation Conditions (With Auto Idle Stop System) (2025)
  • Auto Idle Stop System Description - Operation Conditions (2018 2019 2020)
  • Auto Idle Stop System Description - Operation Conditions (2021 2022)
  • Catalytic Converter System Description
  • EGR System Description
  • EVAP System Description (KA/KC)
  • Electronic Throttle Control System Description
  • PCV System Description
  • PGM-FI System Description
  • PGM-FI System Description - Components
  • PGM-FI System Description - On-Board Snapshot
  • Shutter Grille System Description
  • VTEC/Variable Cylinder Management (VCM) System Description
• Replacement
  • Camshaft Oil Seal Replacement - In Car
    • Notes
    • Replacement
  • Engine Oil Jet Replacement
    • Replacement
  • Pulley End Crankshaft Oil Seal Replacement - In Car
    • Notes
    • Replacement
• Troubleshooting
  • A/C Signal Circuit Troubleshooting
  • MIL Circuit Troubleshooting
  • PCM Power and Ground Circuit Troubleshooting
• Inspection
  • APP Sensor Signal Inspection
    • Inspection
  • Auto Idle Stop System Inspection (With Auto Idle Stop System)
  • Camshaft Timing Inspection
    • Inspection
  • Engine Compression Inspection
    • Inspection
  • Idle Speed Inspection
    • Inspection
• Connector View
  • PCM Connector for Inputs and Outputs
• Symptom Troubleshooting
  • Auto Idle Stop System Symptom Troubleshooting
    • Auto idle stop system does not operate (With Auto Idle Stop System) (2018 2019 2020)
    • Auto idle stop system does not operate (With Auto Idle Stop System) (2021 2022 2023)
    • Auto idle stop system indicator (amber) blinks (With Auto Idle Stop System) (2018 2019 2020)
    • Auto idle stop system indicator (amber) blinks (With Auto Idle Stop System) (2021 2022 2023)
    • Auto idle stop system indicator (green/amber) does not come on (With Auto Idle Stop System)
• Symptom Troubleshooting Index
  • Auto Idle Stop System Symptom Troubleshooting Index (With Auto Idle Stop System) (2018 2019 2020)
  • Auto Idle Stop System Symptom Troubleshooting Index (With Auto Idle Stop System) (2021 2022 2023)
• Test
  • Power Relay Test
    • Notes
    • Test
  • Tailpipe Emissions Test
    • Test
  • Variable Cylinder Management Rocker Arm Test
    • Notes
    • Test
• Adjustment
  • Valve Clearance Adjustment
    • Adjustment