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 MANUALSACURA2015MDX BASEREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE MECHANICALMECHANICALENGINE CONTROL AND ENGINE MECHANICAL - SERVICE, TESTING AND TROUBLESHOOTING (EXCEPT HYBRID)SYMPTOM TROUBLESHOOTING INDEXAUTO IDLE STOP SYSTEM SYMPTOM TROUBLESHOOTING INDEX (2016 2017 2018 2019 2020)

2015 Acura MDX Base

Auto Idle Stop System Symptom Troubleshooting Index (2016 2017 2018 2019 2020)

2015 Acura MDX BaseSECTION Auto Idle Stop System Symptom Troubleshooting Index (2016 2017 2018 2019 2020)

When the vehicle has one of these symptoms, do the diagnostic procedure for the symptom, until you find the cause.

Auto Idle Stop System Symptom Troubleshooting Index

Symptom	Diagnostic procedure	Also check for
Auto idle stop system does not operate	1. Inspect the auto idle stop system . 2. Troubleshoot the auto idle stop system (Auto idle stop system does not operate) - Refer to: Auto Idle Stop System Symptom Troubleshooting - Auto idle stop system indicator (green/amber) does not come on(With Auto Idle Stop System) (2016), or Auto Idle Stop System Symptom Troubleshooting - Auto idle stop system indicator (amber) blinks(With Auto Idle Stop System) (2016), or Auto Idle Stop System Symptom Troubleshooting - Auto idle stop system does not operate(With Auto Idle Stop System) (2016) .
Auto idle stop system indicator (amber) blinks	Troubleshoot the auto idle stop system (Auto idle stop system indicator blinks) - Refer to: Auto Idle Stop System Symptom Troubleshooting - Auto idle stop system indicator (green/amber) does not come on(With Auto Idle Stop System) (2016), or Auto Idle Stop System Symptom Troubleshooting - Auto idle stop system indicator (amber) blinks(With Auto Idle Stop System) (2016), or Auto Idle Stop System Symptom Troubleshooting - Auto idle stop system does not operate(With Auto Idle Stop System) (2016) .
Auto idle stop system indicator (green/amber) does not come on	Troubleshoot the auto idle stop system (Auto idle stop system indicator does not come on) - Refer to: Auto Idle Stop System Symptom Troubleshooting - Auto idle stop system indicator (green/amber) does not come on(With Auto Idle Stop System) (2016), or Auto Idle Stop System Symptom Troubleshooting - Auto idle stop system indicator (amber) blinks(With Auto Idle Stop System) (2016), or Auto Idle Stop System Symptom Troubleshooting - Auto idle stop system does not operate(With Auto Idle Stop System) (2016) .
Idle stop time is short	1. Brake booster leaks: Check the leakage from the following parts, and replace it if necessary - Refer to: Brake Booster Test(With Auto Idle Stop System) (2016), or Brake Booster Test . NOTE: Time that the idling stop operates shortens because it becomes impossible to maintain airtight of the negative pressure line when a small leakage is in the following parts. The following symptoms appear when there is a leakage in following parts. (Small leakage: Idle stop time is short) (Large leakage: Idle stop does not operate) Check valve (built into the vacuum line) Vacuum hose, pipe Vacuum tube (between the brake booster and the brake booster pressure sensor) Brake booster Rod seal or O-ring, or secondary cup of master cylinder Brake booster pressure sensor 2. If equipped, Check the cold storage evaporator installation . 3. Troubleshoot the auto idle stop system - Refer to: Auto Idle Stop System Symptom Troubleshooting - Auto idle stop system indicator (green/amber) does not come on(With Auto Idle Stop System) (2016), or Auto Idle Stop System Symptom Troubleshooting - Auto idle stop system indicator (amber) blinks(With Auto Idle Stop System) (2016), or Auto Idle Stop System Symptom Troubleshooting - Auto idle stop system does not operate(With Auto Idle Stop System) (2016) .

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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.