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.
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HOMESERVICE MANUALSACURA2018TLX BASE, 2.4L ENGREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE MECHANICALMECHANICALENGINE MECHANICAL - TESTING & TROUBLESHOOTING
2018 Acura TLX Base, 2.4L Eng
Engine Mechanical - Testing & Troubleshooting
2018 Acura TLX Base, 2.4L EngSECTION Engine Mechanical - Testing & Troubleshooting
- General Information
- Component Location Index
- Auto Idle Stop System Symptom Troubleshooting
- Auto Idle Stop System Does Not Operate (With Auto Idle Stop System) (2015-17)
- Auto Idle Stop System Does Not Operate (With Auto Idle Stop System) (2018-19)
- Auto Idle Stop System Indicator (Amber) Blinks (With Auto Idle Stop System)
- Auto Idle Stop System Indicator (Green/Amber) Does Not Come On (With Auto Idle Stop System)
- Auto Idle Stop System Symptom Troubleshooting Index (With Auto Idle Stop System)
- General Symptom Troubleshooting
- After Warming Up, Idle Speed Is Above Specifications Without Load (MIL Works OK, No DTCs Set) (With Auto Idle Stop System)
- After Warming Up, Idle Speed Is Above Specifications Without Load (MIL Works OK, No DTCs Set) (Without Auto Idle Stop System, KA/KC)
- After Warming Up, Idle Speed Is Below Specifications Without Load (MIL Works OK, No DTCs Set) (With Auto Idle Stop System)
- After Warming Up, Idle Speed Is Below Specifications Without Load (MIL Works OK, No DTCs Set) (Without Auto Idle Stop System, KA/KC)
- Cold Fast Idle Too High (MIL Works OK, No DTCs Set) (With Auto Idle Stop System)
- Cold Fast Idle Too High (MIL Works OK, No DTCs Set) (Without Auto Idle Stop System, KA/KC)
- Cold Fast Idle Too Low (MIL Works OK, No DTCs Set) (With Auto Idle Stop System)
- Cold Fast Idle Too Low (MIL Works OK, No DTCs Set) (Without Auto Idle Stop System, KA/KC)
- Difficult To Refuel (MIL Works OK, No DTCs Set) (With Auto Idle Stop System)
- Difficult To Refuel (MIL Works OK, No DTCs Set) (Without Auto Idle Stop System, KA/KC)
- Engine Is Hard To Start (MIL Works OK, No DTCs Set) (With Auto Idle Stop System)
- Engine Is Hard To Start (MIL Works OK, No DTCs Set) (Without Auto Idle Stop System, KA/KC)
- Engine Stalls (MIL Works OK, No DTCs Set) (With Auto Idle Stop System)
- Engine Stalls (MIL Works OK, No DTCs Set) (Without Auto Idle Stop System, KA/KC)
- Engine Starts But Stalls Immediately (MIL Works OK, No DTCs Set, Immobilizer Indicator Stays On Or Flashes) (With Auto Idle Stop System)
- Engine Starts But Stalls Immediately (MIL Works OK, No DTCs Set, Immobilizer Indicator Stays On Or Flashes) (Without Auto Idle Stop System, KA/KC)
- Engine Will Not Start (MIL Works OK, No DTCs Set) (With Auto Idle Stop System)
- Engine Will Not Start (MIL Works OK, No DTCs Set) (Without Auto Idle Stop System, KA/KC)
- Engine Will Not Start (MIL Works OK, No DTCs Set, Immobilizer Indicator Stays On Or Flashes) (With Auto Idle Stop System)
- Engine Will Not Start (MIL Works OK, No DTCs Set, Immobilizer Indicator Stays On Or Flashes) (Without Auto Idle Stop System, KA/KC)
- Engine Will Not Start And HDS Does Not Communicate With The PCM (MIL Comes On And Stays On, No DTCs Set) (With Auto Idle Stop System)
- Engine Will Not Start And HDS Does Not Communicate With The PCM (MIL Comes On And Stays On, No DTCs Set) (Without Auto Idle Stop System, KA/KC)
- HDS Does Not Communicate With The PCM Or The Vehicle (With Auto Idle Stop System)
- HDS Does Not Communicate With The PCM Or The Vehicle (Without Auto Idle Stop System, KA/KC)
- Idle Speed Fluctuates (MIL Works OK, No DTCs Set) (With Auto Idle Stop System)
- Idle Speed Fluctuates (MIL Works OK, No DTCs Set) (Without Auto Idle Stop System, KA/KC)
- Idle Stop Time Is Short (With Auto Idle Stop System)
- Low Power (MIL Works OK, No DTCs Set) (With Auto Idle Stop System)
- Low Power (MIL Works OK, No DTCs Set) (Without Auto Idle Stop System, KA/KC)
- MIL Comes On And Stays On, Or Never Comes On At All, No DTCs Set (With Auto Idle Stop System)
- MIL Comes On And Stays On, Or Never Comes On At All, No DTCs Set (Without Auto Idle Stop System, KA/KC)
- Vehicle Rolls Backward When Starting On The Steep Hill (MIL Works OK, No DTCs Set) (With Auto Idle Stop System)
- How To Information
- How To Connect The HDS
- How To Set Readiness Codes (KA/KC) (2015-17)
- 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
- How To Set Readiness Codes (2018-19)
- 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
- Description
- Auto Idle Stop System Description - Operation Conditions (With Auto Idle Stop System)
- Auto Idle Stop System Description (With Auto Idle Stop System)
- Catalytic Converter System Description - Overview (L4)
- Catalytic Converter System Description - Overview (V6)
- EGR System Description - Overview (V6)
- EVAP System Description (KA/KC)
- Electronic Throttle Control System Description
- Intake Air System Description - Intake Manifold Tuning (IMT) Valve System (L4)
- PCV System Description - Overview (L4)
- PCV System Description - Overview (V6)
- PGM-FI System Description - Components (L4, KA/KC)
- PGM-FI System Description - Components (V6, KA/KC)
- PGM-FI System Description - Electronic Control
- PGM-FI System Description - Ignition Timing Control
- PGM-FI System Description - Injection Control (L4)
- PGM-FI System Description - Injection Control (V6)
- PGM-FI System Description - OBD
- PGM-FI System Description - On-Board Snapshot
- VTEC/VTC System Description - VTC (L4)
- VTEC/VTC System Description - VTEC (L4)
- VTEC/Variable Cylinder Management (VCM) System Description (V6)
- Testing
- 12 Volt Battery Internal Resistance Reset (With Auto Idle Stop System)
- CKP Pattern Clear/CKP Pattern Learn Procedure
- Integrated Dynamics System Switch Test
- Jet Pump Test (With SH-AWD)
- PCM Idle Learn Procedure
- PCM Reset
- PCM Update
- Throttle Body Cleaning
- VTEC Rocker Arm Test (L4)
- Variable Cylinder Management Rocker Arm Test (V6)
- Inspection/Adjustment
- APP Sensor Signal Inspection
- Auto Idle Stop System Inspection (With Auto Idle Stop System)
- Block And Piston Inspection (L4)
- Block And Piston Inspection (V6)
- Cam Chain Inspection (L4)
- Camshaft Inspection (L4)
- Camshaft Inspection (V6)
- Camshaft Timing Inspection (L4)
- Camshaft Timing Inspection (V6)
- Catalytic Converter Inspection
- Connecting Rod And Crankshaft End Play Inspection (L4)
- Connecting Rod And Crankshaft End Play Inspection (V6)
- Cylinder Bore Honing (L4)
- Cylinder Bore Honing (V6)
- Engine Compression Inspection (L4)
- Engine Compression Inspection (V6)
- Engine Oil Jet Bolt Inspection (V6)
- Engine Oil Jet And Bolt Inspection (L4)
- Idle Speed Inspection
- PCV Valve Inspection (L4)
- PCV Valve Inspection (V6)
- VTC Actuator Inspection (L4)
- Valve Clearance Adjustment (L4)
- Valve Clearance Adjustment (V6)
- Valve Inspection (L4) (2015-17)
- Valve Inspection (L4) (2018-19)
- Valve Inspection (V6)
- Valve Seat Reconditioning (L4) (2015-17)
- Valve Seat Reconditioning (L4) (2018-19)
- Valve Seat Reconditioning (V6)
- Valve Stem-To-Guide Clearance Inspection (L4) (2015-17)
- Valve Stem-To-Guide Clearance Inspection (L4) (2018-19)
- Valve Stem-To-Guide Clearance Inspection (V6)
- Check
- Connector For Inputs And Outputs
- PCM Connector For Inputs And Outputs (L4) (2015-17)
- PCM Connector For Inputs And Outputs (L4) (2018-19)
- PCM Connector For Inputs And Outputs (V6) (2018-19)
- PCM Connector For Inputs And Outputs (V6, With Auto Idle Stop System) (2015-17)
- PCM Connector For Inputs And Outputs (V6, Without Auto Idle Stop System) (2015-17)
- Troubleshooting
- A/C Signal Circuit Troubleshooting (L4)
- A/C Signal Circuit Troubleshooting (V6)
- MIL Circuit Troubleshooting (L4)
- MIL Circuit Troubleshooting (V6)
- PCM Power And Ground Circuit Troubleshooting (L4) (2015-17)
- PCM Power And Ground Circuit Troubleshooting (L4) (2018-19)
- PCM Power And Ground Circuit Troubleshooting (V6)
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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.