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 MANUALSACURA2023MDX BASEREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROL SYSTEM DTC DIAGNOSTICS (P0335 - P0523)
2023 Acura MDX Base
Engine Control System DTC Diagnostics (P0335 - P0523)
2023 Acura MDX BaseSECTION Engine Control System DTC Diagnostics (P0335 - P0523)
- DTC Troubleshooting
- DTC Troubleshooting: P0335 (3.0L Engine)
- DTC Troubleshooting: P0335 (3.5L Engine)
- DTC Troubleshooting: P0339 (3.0L Engine)
- DTC Troubleshooting: P0339 (3.5L Engine)
- DTC Troubleshooting: P0340 (3.0L Engine)
- DTC Troubleshooting: P0341 (3.5L Engine)
- DTC Troubleshooting: P0344 (3.0L Engine)
- DTC Troubleshooting: P0345 (3.0L Engine)
- DTC Troubleshooting: P0349 (3.0L Engine)
- DTC Troubleshooting: P034A (3.0L Engine)
- DTC Troubleshooting: P034B (3.0L Engine)
- DTC Troubleshooting: P0351, P0352, P0353, P0354, P0355, P0356 (3.5L Engine)
- Notes
- Overview
- Inspection Outline
- Confirmation Procedure
- Related Information
- HDS Function
- +B_IG_COIL, FI_MAIN_RLY_CL- Circuit Inspection
- IG(IGN_COIL) [IG_COIL_RLY_OUT], IGN_PULSE, PHC_GND Circuit Inspection - For DTC P0351: IG(IGN_COIL_1) [IG_COIL_RLY_OUT], IGN_PULSE1, PHC_GND
- IG(IGN_COIL) [IG_COIL_RLY_OUT], IGN_PULSE, PHC_GND Circuit Inspection - For DTC P0352: IG(IGN_COIL_2) [IG_COIL_RLY_OUT], IGN_PULSE2, PHC_GND
- IG(IGN_COIL) [IG_COIL_RLY_OUT], IGN_PULSE, PHC_GND Circuit Inspection - For DTC P0353: IG(IGN_COIL_3) [IG_COIL_RLY_OUT], IGN_PULSE3, PHC_GND
- IG(IGN_COIL) [IG_COIL_RLY_OUT], IGN_PULSE, PHC_GND Circuit Inspection - For DTC P0354: IG(IGN_COIL_4) [IG_COIL_RLY_OUT], IGN_PULSE4, PHC_GND
- IG(IGN_COIL) [IG_COIL_RLY_OUT], IGN_PULSE, PHC_GND Circuit Inspection - For DTC P0355: IG(IGN_COIL_5) [IG_COIL_RLY_OUT], IGN_PULSE5, PHC_GND
- IG(IGN_COIL) [IG_COIL_RLY_OUT], IGN_PULSE, PHC_GND Circuit Inspection - For DTC P0356: IG(IGN_COIL_6) [IG_COIL_RLY_OUT], IGN_PULSE6, PHC_GND
- Ignition Coil Inspection
- Power Distribution Module Inspection
- PCM Inspection
- DTC Troubleshooting: P0365 (3.0L Engine)
- DTC Troubleshooting: P0365 (3.5L Engine)
- DTC Troubleshooting: P0369 (3.0L Engine)
- DTC Troubleshooting: P0369 (3.5L Engine)
- DTC Troubleshooting: P0390 (3.0L Engine)
- DTC Troubleshooting: P0394 (3.0L Engine)
- DTC Troubleshooting: P0400 (3.5L Engine)
- DTC Troubleshooting: P0401 (3.5L Engine)
- DTC Troubleshooting: P0404 (3.5L Engine)
- DTC Troubleshooting: P0405 (3.5L Engine)
- DTC Troubleshooting: P0406 (3.5L Engine)
- DTC Troubleshooting: P0420 (3.0L Engine)
- DTC Troubleshooting: P0420, P0430 (3.5L Engine) (2022 2023 2024)
- DTC Troubleshooting: P0420, P0430 (3.5L Engine) (2025)
- DTC Troubleshooting: P043E, P043F, P2DD9, P2DDA (3.0L Engine)
- DTC Troubleshooting: P0441 (3.5L Engine)
- DTC Troubleshooting: P0443 (3.5L Engine)
- DTC Troubleshooting: P0450 (3.5L Engine)
- DTC Troubleshooting: P0451 (3.5L Engine)
- DTC Troubleshooting: P0452 (3.5L Engine)
- DTC Troubleshooting: P0453 (3.5L Engine)
- DTC Troubleshooting: P0455, P0456 (3.5L Engine)
- Notes
- Overview
- Inspection Outline
- Confirmation Procedure
- Related Information
- HDS Function
- EVAP Canister Vent Hose Inspection
- EVAP Canister Purge Valve Inspection
- EVAP Canister Purge Line Visual Inspection
- EVAP Canister Purge Line Inspection
- EVAP Canister Vent Shut Valve Inspection
- Fuel Fill Pipe and Fuel Tank Vapor Recirculation Tube Visual Inspection
- Shut-Off Valve Inspection
- Shut-Off Valve Seal Inspection
- Fuel Tank Inspection
- DTC Troubleshooting: P0456 (3.0L Engine)
- Notes
- Overview
- Inspection Outline
- Confirmation Procedure
- Related Information
- HDS Function
- EVAP Purge System Inspection (Leakage)
- ELCM System 1 Inspection (Leakage)
- ELCM System 2 Inspection (Blockage)
- Main Flap Unit Inspection
- Fuel Tank System Inspection (Leakage)
- EVAP Canister Inspection (Leakage)
- EVAP Leak Check Module Inspection
- DTC Troubleshooting: P0458 (3.0L Engine)
- Notes
- Overview
- Inspection Outline
- Confirmation Procedure
- Related Information
- HDS Function
- EVAP Canister Purge Valve Component Inspection
- IGPS(PCS) [IGPS(LAF)] Open Wire Inspection
- IGPS(PCS) Shorted Wire Inspection
- +B_FML_MAIN2 Circuit Inspection
- FI_SUB_RLY_CL- Circuit Inspection
- PCS Circuit Inspection
- Power Distribution Module Inspection
- PCM Inspection
- DTC Troubleshooting: P0459 (3.0L Engine)
- DTC Troubleshooting: P0460 (3.0L Engine)
- DTC Troubleshooting: P0460 (3.5L Engine)
- DTC Troubleshooting: P0461 (3.0L Engine)
- DTC Troubleshooting: P0461 (3.5L Engine)
- DTC Troubleshooting: P0462 (3.0L Engine)
- DTC Troubleshooting: P0462 (3.5L Engine)
- DTC Troubleshooting: P0463 (3.0L Engine)
- DTC Troubleshooting: P0463 (3.5L Engine)
- DTC Troubleshooting: P046C (3.5L Engine)
- DTC Troubleshooting: P0475 (3.0L Engine)
- DTC Troubleshooting: P0476 (3.0L Engine)
- DTC Troubleshooting: P0480, P0481 (3.0L Engine)
- Notes
- Overview
- Inspection Outline
- Confirmation Procedure
- Related Information
- HDS Function
- Fan Shroud Assembly Visual Inspection - For DTC P0480: A/C Condenser Fan Shroud Assembly
- Fan Shroud Assembly Visual Inspection - For DTC P0481: Radiator Fan Shroud Assembly
- RFC_DRIVER_RLY_OUT, PGND Circuit Inspection - For DTC P0480: RFC_DRIVER_RLY_OUT, PGND
- RFC_DRIVER_RLY_OUT, PGND Circuit Inspection - For DTC P0481: RFC_DRIVER_RLY_OUT2, PGND
- IG1_VSA/ABS Circuit Inspection
- FAN_CONTROL Circuit Inspection - For DTC P0480: FAN_CONTROL
- FAN_CONTROL Circuit Inspection - For DTC P0481: FAN_CONTROL_2
- Fan Motor/RFC Unit Inspection - For DTC P0480: A/C Condenser Fan Motor/RFC Unit 2
- Fan Motor/RFC Unit Inspection - For DTC P0481 Radiator Fan Motor/RFC Unit 1
- PCM Inspection
- DTC Troubleshooting: P0498 (3.5L Engine)
- DTC Troubleshooting: P0499 (3.5L Engine)
- DTC Troubleshooting: P049D (3.5L Engine)
- DTC Troubleshooting: P04DF (3.0L Engine)
- DTC Troubleshooting: P04DF (3.5L Engine)
- DTC Troubleshooting: P04F0 (3.0L Engine)
- Notes
- Overview
- Inspection Outline
- Confirmation Procedure
- Related Information
- HDS Function
- EVAP Purge System 1 Inspection (Blockage/Leakage)
- EVAP Purge System 2 Inspection (Blockage)
- EVAP Purge System 2 Inspection (Leakage)
- ELCM System Inspection (Blockage/Leakage)
- Main Flap Unit Inspection
- Fuel Tank System Inspection (Leakage)
- EVAP Canister Inspection (Leakage)
- EVAP Canister Inspection (Blockage)
- EVAP Leak Check Module Inspection
- DTC Troubleshooting: P04F1 (3.0L Engine)
- Notes
- Overview
- Inspection Outline
- Confirmation Procedure
- Related Information
- HDS Function
- EVAP Purge System 1 Inspection (Blockage/Leakage)
- EVAP Purge System 2 Inspection (Blockage)
- EVAP Purge System 2 Inspection (Leakage)
- ELCM System Inspection (Blockage/Leakage)
- Main Flap Unit Inspection
- Fuel Tank System Inspection (Leakage)
- EVAP Canister Inspection (Leakage)
- EVAP Canister Inspection (Blockage)
- EVAP Leak Check Module Inspection
- DTC Troubleshooting: P04F1 (3.5L Engine)
- DTC Troubleshooting: P0506 (3.0L Engine)
- DTC Troubleshooting: P0506 (3.5L Engine)
- DTC Troubleshooting: P0507 (3.0L Engine)
- DTC Troubleshooting: P0507 (3.5L Engine)
- DTC Troubleshooting: P050A (3.0L Engine)
- DTC Troubleshooting: P050A (3.5L Engine) (2022 2023 2024)
- DTC Troubleshooting: P050A (3.5L Engine) (2025)
- DTC Troubleshooting: P050B (3.0L Engine)
- DTC Troubleshooting: P050B (3.5L Engine) (2022 2023 2024)
- DTC Troubleshooting: P050B (3.5L Engine) (2025)
- DTC Troubleshooting: P050D (3.0L Engine)
- DTC Troubleshooting: P050D (3.5L Engine) (2022 2023 2024)
- DTC Troubleshooting: P050D (3.5L Engine) (2025)
- DTC Troubleshooting: P0521 (3.5L Engine)
- DTC Troubleshooting: P0522 (3.0L Engine) (2022 2023 2024)
- DTC Troubleshooting: P0522 (3.0L Engine) (2025)
- DTC Troubleshooting: P0522 (3.5L Engine)
- DTC Troubleshooting: P0523 (3.0L Engine) (2022 2023 2024)
- DTC Troubleshooting: P0523 (3.0L Engine) (2025)
- DTC Troubleshooting: P0523 (3.5L Engine)
- DTC Troubleshooting: P0532 (3.0L Engine)
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- β’ You smell fuel, burning insulation, or see smoke.
- β’ Brakes feel soft, pull hard to one side, or make grinding noises.
- β’ The engine overheats, stalls repeatedly, or misfires under load.
- β’ You are missing required tools, torque specs, or safe lifting equipment.
- β’ You are not confident in the next step or safety outcome.