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.
Engine Control And Engine Mechanical - Service, Testing And Troubleshooting (Except Hybrid)
2018 Acura MDX BaseSECTION Engine Control And Engine Mechanical - Service, Testing And Troubleshooting (Except Hybrid)
- Connector View
- Symptom Troubleshooting Index for Viewer
- Auto idle stop system does not operate (2016 2017 2018 2019 2020)
- Auto idle stop system indicator (amber) blinks (2016 2017 2018 2019 2020)
- Auto idle stop system indicator (green/amber) does not come on (2016 2017 2018 2019 2020)
- Difficult to refuel (MIL works OK, NO DTCs set) (2014 2015)
- Difficult to refuel (MIL works OK, NO DTCs set) (2016)
- Difficult to refuel (MIL works OK, NO DTCs set) (2017 2018 2019 2020)
- Engine is hard to start (MIL works OK, no DTCs set) (2014 2015)
- Engine is hard to start (MIL works OK, no DTCs set) (2016)
- Engine is hard to start (MIL works OK, no DTCs set) (2017 2018 2019 2020)
- Engine stalls (MIL works OK, no DTCs set) (2014 2015)
- Engine stalls (MIL works OK, no DTCs set) (2016)
- Engine stalls (MIL works OK, no DTCs set) (2017 2018 2019 2020)
- Engine starts but stalls immediately (MIL works OK, no DTCs set, immobilizer indicator stays on or flashes) (2014 2015)
- Engine starts but stalls immediately (MIL works OK, no DTCs set, immobilizer indicator stays on or flashes) (2016)
- Engine starts but stalls immediately (MIL works OK, no DTCs set, immobilizer indicator stays on or flashes) (2017 2018 2019 2020)
- Engine will not start (MIL works OK, no DTCs set) (2014 2015)
- Engine will not start (MIL works OK, no DTCs set) (2016)
- Engine will not start (MIL works OK, no DTCs set) (2017 2018 2019 2020)
- Engine will not start (MIL works OK, no DTCs set, immobilizer indicator stays on or flashes) (2014 2015)
- Engine will not start (MIL works OK, no DTCs set, immobilizer indicator stays on or flashes) (2016)
- Engine will not start (MIL works OK, no DTCs set, immobilizer indicator stays on or flashes) (2017 2018 2019 2020)
- Engine will not start and HDS does not communicate with the PCM(MIL comes on and stays on, no DTCs set) (2014 2015)
- Engine will not start and HDS does not communicate with the PCM(MIL comes on and stays on, no DTCs set) (2016)
- Engine will not start and HDS does not communicate with the PCM(MIL comes on and stays on, no DTCs set) (2017 2018 2019 2020)
- HDS does not communicate with the PCM or the vehicle (2014 2015)
- HDS does not communicate with the PCM or the vehicle (2016)
- HDS does not communicate with the PCM or the vehicle (2017 2018 2019 2020)
- Idle speed fluctuates (MIL works OK, no DTCs set) (2017 2018 2019 2020)
- Idle stop time is short (2016 2017 2018 2019 2020)
- Low power (MIL works OK, no DTCs set) (2014 2015)
- Low power (MIL works OK, no DTCs set) (2016)
- Low power (MIL works OK, no DTCs set) (2017 2018 2019 2020)
- Disassembly, Reassembly, and Inspection
- Check
- Component Location Index
- Auto Idle Stop System Component Location Index (2016 2017 2018 2019 2020)
- Catalytic Converter System Component Location Index
- EGR System Component Location Index
- EVAP Control System Component Location Index
- Electronic Throttle Control System Component Location Index
- Engine Block Assembly Component Location Index
- PCV System Component Location Index
- PGM-FI System Component Location Index
- VTEC/Variable Cylinder Management (VCM) System Component Location Index
- Replacement
- Description & Operation
- Auto Idle Stop System Description
- Auto Idle Stop System Description - Operation Conditions
- Catalytic Converter System Description - Overview
- EGR System Description - Overview
- EVAP System Description
- Electronic Throttle Control System Description
- PCV System Description - Overview
- PGM-FI System Description - Components
- PGM-FI System Description - Electronic Control
- PGM-FI System Description - Ignition Timing Control
- PGM-FI System Description - Injection Control
- PGM-FI System Description - OBD
- PGM-FI System Description - On-Board Snapshot
- VTEC/Variable Cylinder Management (VCM) System Description
- Test
- Rewrite
- 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
- Adjustment
- Inspection
- APP Sensor Signal Inspection
- Auto Idle Stop System Inspection (2016 2017 2018 2019 2020)
- Block and Piston Inspection
- Camshaft Inspection
- Camshaft Timing Inspection
- Catalytic Converter Inspection
- Connecting Rod and Crankshaft End Play Inspection
- Engine Compression Inspection
- Engine Oil Jet Bolt Inspection
- Idle Speed Inspection
- PCV Valve Inspection
- Valve Inspection
- Valve Stem-to-Guide Clearance Inspection
- Symptom Troubleshooting Index
- Repair Regeneration
- Learning Reset Clear
- Removal Installation Inspection
- Symptom Troubleshooting
- Auto Idle Stop System Symptom Troubleshooting - Auto idle stop system does not operate (2016 2017 2018 2019 2020)
- Auto Idle Stop System Symptom Troubleshooting - Auto idle stop system indicator (amber) blinks (2016 2017 2018 2019 2020)
- Auto Idle Stop System Symptom Troubleshooting - Auto idle stop system indicator (green/amber) does not come on (2016 2017 2018 2019 2020)
- Troubleshooting
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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.