2003 Acura 3.2CL BaseFACTORY OEM SERVICE PROCEDURE

Ignition Coil Circuit Testing: MDX

  1. Remove ignition coil cover. Disconnect 6 ignition coil 3-pin connectors. Turn ignition on. Measure voltage between ground and each ignition coil connector terminal No. 3 (Black/White wire). See appropriate wiring diagram under ENGINE PERFORMANCE in WIRING DIAGRAMS. If battery voltage is present, go to next step. If battery voltage is not present, repair open circuit between ignition coil(s) connector terminal No. 3 (Black/White wire) and ignition coil relay. See IGNITION COIL RELAY CIRCUIT TEST (MDX)  article.
  2. Turn ignition off. Measure continuity between ignition coil 3-pin connector terminal No. 2 (Black wire) and ground. If continuity is present, go to next step. If continuity is not present, repair open circuit between ignition coil(s) connector terminal No. 2 (Black wire) and ground terminals G101 and G102.
  3. Turn ignition switch to START position. Measure voltage between ignition coil 3-pin connectors terminal No. 1 and ground. See IGNITION COIL 3-PIN CONNECTOR TERMINAL NO. 1 IDENTIFICATION (MDX)  . If about .5 volt is present, replace ignition coil. If about .5 volt is not present, repair open circuit in appropriate wire between ignition coil connector terminal No. 1 and PCM.
IGNITION COIL 3-PIN CONNECTOR TERMINAL NO. 1 IDENTIFICATION (MDX)

Ignition Coil Wire Color
No. 1 Yellow/Green
No. 2 Blue/Red
No. 3 White/Blue
No. 4 Brown
No. 5 Black/Red
No. 6 Brown/White
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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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