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.
Retrieving Flash Codes Using "D4" Indicator Light
2004 Acura 3.5RLSECTION Retrieving Flash Codes Using "D4" Indicator Light
- If DTC exists, "D4" indicator light on A/T gear position indicator on instrument panel will blink when ignition is turned on. To retrieve DTC, turn ignition off.
- Install jumper wire between service check connector terminals. Service check connector is a Gray 2-pin connector located below right side of dash, above PCM. See Fig 2 .
- Turn ignition on. DTCs will be displayed by a flashing or blinking "D4" indicator light on A/T gear position indicator on instrument panel.NOTE: If Malfunction Indicator Light (MIL) on instrument panel also flashes, PGM-FI system must be checked. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.
- Note number of blinks from "D4" indicator light. A short blink indicates a single digit flash code. A long blink equals 10 short blinks. For example, if "D4" indicator light blinks once, this is flash code No. 1. If "D4" indicator light blinks one long blink and then 4 short blinks, this is flash code No. 14. See Fig 3 .
- Once flash code is obtained, turn ignition off. Remove jumper wire from service check connector. Determine probable cause and symptom. See DTC/FLASH CODE DEFINITIONS table. Repair as necessary. See DIAGNOSTIC TESTS .
- Clear DTC. See CLEARING DIAGNOSTIC TROUBLE CODES , and then recheck system operation. If customer describes symptoms listed in DTC/FLASH CODE DEFINITIONS table and "D4" indicator light is off, it may be necessary to test drive vehicle to recreate symptom, and then check for flash code.
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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.