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ECU problems Posted by Karl [Email] ![]() ![]() |
OK, so I orginally posted what I thought it was a fuel pump problem. The pumps seem to work when outside power is applied. I have a worthless Haynes manual, decided to go to the library and make some copies of some reference manual. My car is an '87 900S N/A. I went throught the diagnostics and this is what I have so far. Not fun currently 87 degrees with humidity feels like 97 degrees.
1. .2-.6 volts at the injectors
2. no voltage at pin 18(ignition signal)
3. good fuse no. 22
4. no power indicated with test light when jumping ECU pin 18 (Ignition power) with 5,11,25 (Engine lift hook ground)
5. no pulsing with test light with ECU pin 1(ignition coil)and ground while cranking engine.
6. no voltage when ground ECU pin 21 (System Relay ground term 85)and test at ECU 9 (System relay Term. 87)
7. grounded pin 21 (system relay 85)and 17 fuel pump relay 87), checked green/red wire on limp-home test connector, no voltage.
8. no voltage on fuel system relay No. 30 and No. 86
9. no continuity between system relay No. 85 and ECU harness connector pin No. 21 (system relay ground)
10. no continuity between 87B system relay and ECU pin 2 (Mass Meter)
11. no continuity between system relay No. 87 and pump relay No. 86.
It is hard to believe that I have no power, continuity, or groud. I will clean the body grounds to see if it helps.
Karl
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