Hi Guys,

My Integra started an intermitent problem this weekend.
It gradually, over last 4 days, became a permanent issue.

The symptom was for the fuel pump not to prime during the ignition cycle.
I troubleshooted the main relay and found that I have no ground at pin #3.

This ground is supplied directly by the ECU.
I tried 2 P28 ecu (both known to be working before last weekend) --> no change.

If if add a jumper between Main relay Pin#3 and a good chassis ground, fuel pump is priming and car starts like a charm.

Any idea what could cause the ECU to not provide this ground ?

Car: Integra 95 race car
Engine: B18C
ECU: P28 - socketed

 

ok nevermind ... found a broken wire inside the insulation between G101 and L/H firewall connector

 

Nice work !!