TSB : Engine Control System / Engine Mechanical - Testing & Troubleshooting

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Expand All (for easy ctrl-f) Collapse All 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