The car is Civic 2006 oriel manual with stock D16W9 engine. The issue is engine stops during driving. Its ECU relay clicks like 5 times at like 1 second interval, engine too stalls, restarts, stalls.... till the last click and the car shuts off. Cluster lights work. Check engine light comes on during this duration. when ignition is switched off, check engine light goes away, yet the engine cranks but not start. After few minutes, all is back to normal and car starts just fine just for few more KMs and issue occurs again.
Have scanned it and there are no DTCs. (both when car exhibits this behaviour and normal working too).
Here are the findings so far:
1- Checked the wiring, under dash, there are 2 PGM FI relays, one is for fuel pump/injectors, this relay stops working when the issue occurs.
2- Some jugaaru previously tried to resolve it by jumping the second relay (PGM FI 2, fuel pump relay) via Main PGM FI relay. With this jugaar, when the issue occurs, CEL blinks, relay 2 clicks but car stays driving (as the relay is directly powered). I have removed this jugaar and wiring is back to stock state, now car shuts off when issue occurs.
As there are no DTCs, banging my head as where to start. Have cleaned and properly attached ground terminals: body, engine, battery.
Here are the things i suspect:
1. Crank/Cam sensor
2. Alternator (It seems to be doing when there is electrical load, i.e. headlights AC on) but not sure, as happened without it too once.
3. ECU is malfunctioning
Btw, will Honda HDS be able to read more DTCs? as currently generic scanner is being used. Any good in taking it to honda? Dont want it to be destroyed at the hands of street side "lektrishuns".
Your help is highly appreciated.
@capsat @Xulfiqar @SER_GTR