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.
1999 Acura Integra GS-R, 2D CoupeFACTORY OEM SERVICE PROCEDURE
Alternator Control System Test
- Disconnect 4-pin connector from alternator. Start engine and turn headlights (high beams) on. Use DVOM to measure voltage between 4-pin connector terminal No. 2 and battery positive terminal. See Figure . If one volt or less exists, go to next step. If greater than one volt exists, go to step 3 .
- Turn headlight and ignition switch to OFF positions. Disconnect 32-pin connector "A" from ECM. Use DVOM to measure resistance between ECM connector "A" terminal No. 19 and generator 4-pin connector terminal No. 2 (White/Green wire). If continuity exists, go to GENERATOR/REGULATOR OUTPUT TEST . If continuity does not exist, repair open in White/Green wire.
- Turn headlight and ignition switch to OFF positions. Disconnect ECM 32-pin connector "A". Using DVOM, check for continuity between ground and ECM connector "A" terminal No. 19 (White/Green wire). If continuity exists, repair short to ground in White/Green wire. If continuity does not indicated, replace ECM with a known-good unit and recheck system operation. If system tests okay, replace ECM.
Factory Service Tools
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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.
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