New TN User
Join Date: Aug 2010
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Thanks for chiming in,
I was checking for 12VDC when I put the ign. sw. to the 'ON' pos. I was under the assumption I would get 2 seconds of power. Then the crank positon sensor give the ECU feedback that the motor is turning thereby giving me continuous power to the fuel pump.
Maybe I have to go to 'START' to get the 2 seconds worth? I'll have to check the manual when I get home.
It is an automatic, there is a neutral safety switch that I should check.
This all started about 2 weeks ago, MIL came on with a P0172 code (right bank too rich), cleared it, came back a week later, cleared it again, then the car would start but wouldn't accelerate, in sub-idle mode. Towed home, read codes, same P0172 but with a P1133 (A/F sensor) upstream O2 sensor too rich. So I test the sensor, heating element (OK), voltage steady at .7VDC. Book says it should switch from .1 to .9VDC, so I thought that may be a problem. I replace it, nothing. Several other troubleshooting tips were (to make a long story short) check fuel pressure. I do that with (0) psi. Fine, given the age and mileage I can accept that it is the pump. I go to replace it and just for the heck of it I decided to bench check it. 60 psi and holding. Dang, so I check for power at the pump and 0 VDC. So I troubleshoot the system for power, I can manually supply 12VDC at the COR relay and make the pump work. I've checked the relays, swapped it with the EFI relay, nothing. I basically troubleshooted the system so far as to tell me the the power for the relay holding coil just isn't there.
So far I think I need to see in detail what supplies the ECU information to allow power to the pump.