Disconnect each of the components or the connectors below, one at a time and check for continuity between the PGM-FI main relay 1 4P connector terminal No. 1 and body ground. PGM-FI main relay 2 ECM/PCM connector A (31P) Each injector 2P connector Idle air control (IAC) valve 3P connector Top dead centre (TDC) sensor 3P connector Crankshaft position (CKP) sensor 3P connector Wire side of female terminals Is there continuity? YES - Go to step 23. NO - Replace the component that made continuity to body ground go away when disconnected. If the item is the ECM/PCM, substitute a known-good ECM/PCM and recheck, refer to the '01 Civic Shop Manual on this CD (see page 11-313). If symptom/indication goes away, replace the original ECM/PCM. Also replace the No. 6 ECU (ECM/PCM) (15 A) fuse. Disconnect the connectors of all these components. PGM-FI main relay 2 ECM/PCM connector A (31P) Injectors Idle air control (IAC) valve Top dead centre (TDC) sensor Crankshaft position (CKP) sensor

Check for continuity between the PGM-FI main relay 1 4P connector terminal No. 2 and body ground. Wire side of female terminals Is there continuity? YES - Repair short in the wire between the PGM-FI main relay 1 and each item. Also replace the No. 6 ECU (ECM/PCM) (15A) fuse. NO - Replace the PGM-FI main relay 1. Also replace the No 6 ECU (ECM/PCM) (15A) fuse. Inspect the No. 17 FUEL PUMP (15A) fuse in the under-dash fuse/relay box. Is the fuse OK? YES - Go to step 37. NO - Go to step 26. Remove the blown No. 17 FUEL PUMP (15A) fuse in the under-dash fuse/relay box. Disconnect ECM/PCM connector E (31P).