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 MANUALSACURA1998INTEGRA RS, AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - BASIC TESTINGIGNITION CHECKS2.5TLIGNITION CONTROL MODULE INPUT TEST

1998 Acura Integra RS, Automatic

Ignition Control Module Input Test

1998 Acura Integra RS, AutomaticSECTION Ignition Control Module Input Test

Turn ignition off. Disconnect ignition control module (ICM) 4-pin connector mounted on ignition coil. Check for continuity between terminal No. 4 (Black wire) and ground. See Fig 1. If continuity exists, go to next step. If continuity does not exist, check for an open Black wire, disconnected terminals or a poor G101 ground located near Idle Air Control (IAC) valve.

Fig 1: Testing Ignition Control Module Input Circuit (2.5TL)
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Turn ignition on. Check voltage between ICM 4-pin connector terminals No. 3 (Black/Yellow wire) and No. 4 (Black wire). If battery voltage exists, go to next step. If battery voltage does not exist, check for an open in Black/Yellow wire between ignition coil and ICM, disconnected terminals or faulty ignition coil.
With ignition on, check for battery voltage between ICM 4-pin connector terminals No. 2 (Green wire) and No. 4 (Black wire). If battery voltage does not exist, check for an open in Green wire between ignition coil and ICM. Repair as necessary. If Green wire is okay, substitute a known-good ignition coil and recheck.

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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.