MDX V6-3471cc 3.5L (2002)
30. Measure voltage between PCM connector terminal A10 and body ground.
Is there about 5 V (or battery voltage)?
YES - Go to step 31.
NO - Repair short in the wire between the DLC and the PCM (A10).
31. Turn the ignition switch OFF.
32. Disconnect PCM connector A (32P).
33. Turn the ignition switch ON (II).
Is the MIL on?
YES - Repair short in the wire between the gauge assembly and the PCM (A18).
NO - Substitute a known-good PCM and recheck. If the symptom/indication goes away, replace the original PCM.