S2000 L4-2.2L (2004)
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26. Check for continuity between body ground and data link connector (DLC) (16P) terminal No. 7.
Is there continuity?
YES - Repair short in the wire between the DLC and the ECM (A21).
NO - Go to step 27.
27. Turn the ignition switch ON (II).
28. Measure voltage between ECM connector terminal A10 and body ground.
Is there about 5 V?
YES - Go to step 29.
NO - Repair short in the wire between the DLC and the ECM (A10).
29. Turn the ignition switch OFF.
30. Disconnect ECM connector A (32P).
31. Reconnect the negative cable to the battery.
32. Turn the ignition switch ON (II).
Is the MIL on?
YES - Repair short in the wire between the gauge assembly and the ECM (A18).
NO - Substitute a known-good ECM and recheck. If the symptom/indication goes away, replace the original ECM.