Question about 1990 Toyota Celica

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1990 toyota celica gls

Does ecm turn fuel pump relay with power or ground

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The ecm doesn't control the pump relay. it is energized by turning the key and supplying positive voltage.

Posted on Sep 22, 2008

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62217_isuzfuse_1.jpg
Underhood fuse block swap out relay #7 thats the ECM relay.
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Page 1 of 1 SYSTEM/COMPONENT TESTS - 2.6L EFI -1994 Isuzu Rodeo

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Your have a Fuel Pump A Control Circuit /Open try these possible solutions. Using a OBD II scan tool. Free use at Autozone. Check operation of fuel pump. Remove the glove compartment. Turn the ignition switch to ON. CHECK: Connect terminal FC of the ECM connector and the body ground. Check for the fuel pressure in the inlet hose when it is pinched by hand. OK:There is pressure in the fuel inlet hose. At this time, you will hear a fuel flowing noise .OK. Check for starter signal circuit Check for ECM power source circuit, if no good Repair or replace.OK Check circuit opening relay, if no good Replace circuit opening relay.OK. Check voltage between terminal FC of ECM connector and body ground to do this Remove the glove compartment Turn the ignition switch ON. Measure the voltage between terminal FC of the ECM connector and the body ground OK: Voltage: 9 – 14 V OK. Check for open in harness and connector between EFI main relay (Marking: EFI) and circuit opening relay, and circuit opening relay and ECM. Check fuel pump, if no good Repair or replace fuel pump.OK. Check for open in harness and connector between circuit opening relay and fuel pump, and fuel pump and body ground, if no good Repair or replace harness or connector.OK Check and replace ECM. Good luck and I really hope this solves that problem you are having. Please rate me. If you need further assistance you can always ask me. wutxtye0rjd9d9ekmodqt1eoxkvn9hr9qjz1l3dabggyud7sdgr36czsrfxqenadhnijx9nfayi+sz1sug0aaaaasuvork5cyii=

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