Civic L4-1668cc 1.7L SOHC MFI (2003)
12. Check for continuity between body ground and ECM/PCM connector terminal B13.
Is there continuity?
YES - Test the alternator (see step 1).
NO - Repair open in the wire between the ECM/PCM (B13) and the alternator.
13. Turn the ignition switch OFF.
14. Disconnect ECM/PCM connector B (24P)
15. Check for continuity between body ground and ECM/PCM connector terminal B13.
Is there continuity?
YES - Repair short in the wire between the ECM/PCM (B13) and the alternator.
NO - Update the ECM/PCM jilt does not have the latest software, or substitute a known-good ECM/PCM, then recheck. If the symptom/indication
goes away with a known-good ECM/PCM, replace the original ECM/PCM.