Skylar M
Newbie
But the truck was cranking yesterday before this ground wire fix and wasn’t popping a starter code yesterday when the code reader was connecting again.Failed starter drive?
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But the truck was cranking yesterday before this ground wire fix and wasn’t popping a starter code yesterday when the code reader was connecting again.Failed starter drive?
For what it's worth, here's the Fuel Pump Relay circuit that we're currently troubleshooting as seen on p.1693 in Vol. 3 of the '98 FSM .pdf file:
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When I get back I'll add some real-world voltage measurements to this schematic.
Pin 87. If I use a jumper wire to pin 30 from 87, it does turn on and run. But now after that, I checked again and it is reading 12v at pin 87.
Now the code reader does connect. It pops 2 codes that I had before this as well.
P0453
P1351
Also the fuel pump does not turn on and run with the relay installed still.
It was the battery not having the juice to kick the starter. That’s why the loud whine when trying to start. Charged up and all good. Cranking again. - good
Fuel pump relay test is - good
Ecm fuse - good
oil pressure switch power wire (orange) has 12v - good
85 with key on - checking ground - has battery voltage 12v - good
86 - checking ground - has battery voltage 12v - good
87 - has 12 volts - good
30 - connected to battery and checking ground - has battery 12v - ground at fuel pump is good
Fuel pump runs if jumped at relay location between 87 & 30 - good
Try to start while jumping and just cranks and no start. - bad
No 2 sec (prime) control power to pin 85 - bad
Nothing with relay installed - I don’t hear the switch or fuel pump at all when I turn key on. - bad
I don’t have a pressure gauge, so I can’t see if the fuel pressure is shooting up while I jump it though. So there is no telling if the pump itself is actually working correctly. But I know it was before this head gasket job.
I went out to double check just in case. Pin 86 is (no tone) and 0 resistance.
What i meant is that with the multimeter charged off positive and connecting to pin 86, reads 12v meaning that the ground from 86 is good.
I did switch the relays not knowing I can because of the 5 pin for the fuel relay. But that makes sense because pin 87a is nothing. Anyway, all is good with the relays.
Still no fuel pump kick on.
Code reader - no connection
The weird thing is that on pin 87, it is charged at 12v even with the key off?!