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.
2021 Acura TLX BaseFACTORY OEM SERVICE PROCEDURE
Engine Mechanical And Engine Control System - Service, Testing And Troubleshooting (1 Of 2)
- Symptom Troubleshooting Index for Viewer
- After Warming Up, Idle Speed Is Above Specifications Without Load (MIL works Ok, no DTCs set) (2.0L Engine (USA/Canada models))
- After Warming Up, Idle Speed Is Above Specifications Without Load (MIL Works OK, No DTCs Set) (3.0L Engine (USA/Canada models))
- After Warming Up, Idle Speed Is Below Specifications Without Load (MIL Works OK, No DTCs Set) (2.0L Engine (USA/Canada models))
- After Warming Up, Idle Speed Is Below Specifications Without Load (MIL Works OK, No DTCs Set) (3.0L Engine (USA/Canada models))
- Auto Idle Stop System Does Not Operate
- Auto Idle Stop System Indicator Does Not Come On: Auto Idle Stop Indicator (Green) Auto Idle Stop System Indicator (Amber) Auto Idle Stop OFF Indicator (White) Auto Idle Stop Suspend Indicator (White)
- Cold Fast Idle Too High (MIL Works OK, No DTCs Set) (2.0L Engine (USA/Canada models))
- Cold Fast Idle Too High (MIL Works OK, No DTCs Set) (3.0L Engine (USA/Canada models))
- Cold Fast Idle Too Low (MIL Works OK, No DTCs set) (2.0L Engine (USA/Canada models))
- Cold Fast Idle Too Low (MIL Works OK, No DTCs Set) (3.0L Engine (USA/Canada models))
- Difficult To Refuel (MIL Works OK, NO DTCs set) (2.0L Engine (USA/Canada models))
- Difficult To Refuel (MIL works OK, NO DTCs set) (3.0L Engine (USA/Canada models))
- Engine Abnormal Noise While Fuel Cut-Off Control (2.0L Engine)
- Engine Abnormal Noise While Fuel Cut-Off Control (3.0L Engine)
- Engine Is Hard To Start (MIL works OK, no DTCs set) (2.0L Engine (USA/Canada models))
- Engine Is Hard To Start (MIL works OK, no DTCs set) (3.0L Engine (USA/Canada models))
- Engine Stalls (MIL works OK, no DTCs set) (2.0L Engine (USA/Canada models))
- Engine Stalls (MIL works OK, no DTCs set) (3.0L Engine (USA/Canada models))
- Engine Starts But Stalls Immediately (MIL works OK, no DTCs set, security indicator stays on or flashes) (2.0L Engine (USA/Canada models))
- Engine Starts But Stalls Immediately (MIL Works OK, No DTCs Set, Security Indicator Stays On Or Flashes) (3.0L Engine (USA/Canada models))
- Engine Will Not Start (MIL Works OK, No DTCs Set) (2.0L Engine (USA/Canada models))
- Engine Will Not Start (MIL Works OK, No DTCs Set) (3.0L Engine (USA/Canada models))
- Engine Will Not Start (MIL Works OK, No DTCs Set, Security Indicator Stays On Or Flashes) (2.0L Engine (USA/Canada models))
- Engine Will Not Start (MIL Works OK, No DTCs Set, Security Indicator Stays On Or Flashes) (3.0L Engine (USA/Canada models))
- Engine Will Not Start And HDS Does Not Communicate With The PCM (MIL Comes On And Stays On, No DTCs set) (2.0L Engine (USA/Canada models))
- Engine Will Not Start And HDS Does Not Communicate With The PCM (MIL Comes On And Stays On, No DTCs Set) (3.0L Engine (USA/Canada models))
- HDS Does Not Communicate With The PCM Or The Vehicle (2.0L Engine (USA/Canada models))
- HDS Does Not Communicate With The PCM Or The Vehicle (3.0L Engine (USA/Canada models))
- Idle Speed Fluctuates (MIL Works OK, No DTCs Set) (2.0L Engine (USA/Canada models))
- Idle Speed Fluctuates (MIL Works OK, No DTCs Set) (3.0L Engine (USA/Canada models))
- Idle Stop Time Is Short
- Low Power (MIL works OK, no DTCs set) (2.0L Engine (USA/Canada models))
- Low Power (MIL Works OK, No DTCs set) (3.0L Engine (USA/Canada models))
- MIL Comes On And Stays On, Or Never Comes On At All, No DTCs Set (2.0L Engine (USA/Canada models))
- MIL Comes On And Stays On, Or Never Comes On At All, No DTCs Set (3.0L Engine (USA/Canada models))
- Starter System Warning Message Displays On (no DTCs set)
- Troubleshooting
- A/C Signal Circuit Troubleshooting (2.0L Engine)
- A/C Signal Circuit Troubleshooting (3.0L Engine)
- Auto Idle Stop System Symptom Troubleshooting - Auto Idle Stop System Does Not Operate
- Auto Idle Stop System Symptom Troubleshooting - Starter System Counter Inspection (2021 2022 2023)
- Auto Idle Stop System Symptom Troubleshooting - Starter System Counter Inspection (USA/Canada models) (2024 2025)
- Intake Air System and Exhaust System Symptom Troubleshooting - Turbocharger Under Boost Problem (3.0L Engine)
- MIL Circuit Troubleshooting (2.0L Engine)
- MIL Circuit Troubleshooting (3.0L Engine)
- PCM Power and Ground Circuit Troubleshooting (2.0L Engine)
- PCM Power and Ground Circuit Troubleshooting (3.0L Engine)
- VTEC System Oil Pressure Troubleshooting (2.0L Engine)
- Description and Operation
- Active Vibration Control System Description
- Active Vibration Control System Description (3.0L Engine)
- Auto Idle Stop System Description - Operation Conditions (2.0L Engine)
- Auto Idle Stop System Description - Operation Conditions (3.0L Engine)
- Auto Idle Stop System Description (2.0L Engine)
- Auto Idle Stop System Description (3.0L Engine)
- EVAP System Description (2.0L Engine)
- EVAP System Description (3.0L Engine)
- Electronic Throttle Control System Description (2.0L Engine)
- Electronic Throttle Control System Description (3.0L Engine)
- PCV System Description (2.0L Engine)
- PCV System Description (3.0L Engine)
- PGM-FI System Description - Components (2.0L Engine)
- PGM-FI System Description - Components (3.0L Engine)
- PGM-FI System Description - On-Board Snapshot (2.0L Engine)
- PGM-FI System Description - On-Board Snapshot (3.0L Engine)
- PGM-FI System Description (2.0L Engine)
- PGM-FI System Description (3.0L Engine)
- VTEC/VTC System Description (2.0L Engine)
- Variable Cylinder Management (VCM)/VTC System Description (3.0L Engine)
- Inspection
- Connector View
- Removal, Installation & Inspection
- APP Sensor Signal Inspection
- Air Cleaner Element Inspection
- Balancer Shaft Inspection (2.0L Engine)
- Block and Piston Inspection (2.0L Engine)
- Block and Piston Inspection (3.0L Engine)
- CKP Pattern Clear/CKP Pattern Learn Procedure (2.0L Engine)
- Cam Chain Inspection (2.0L Engine)
- Cam Chain Removal and Installation (2.0L Engine)
Factory Service Tools
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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.
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