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1990 Toyota Pickup crank no start

Tiny
MCDANIEL30
  • MEMBER
  • 1990 TOYOTA PICKUP
  • 2.4L
  • 4 CYL
  • 2WD
  • MANUAL
Jumped pins fp and b+ at diagnostic port this activated fuel pump is this the sign of a bad relay?
Monday, June 9th, 2014 AT 6:17 PM

6 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
That is the first thing I would check. Chances are it is bad or there is a wiring issue to the relay box.
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Monday, June 9th, 2014 AT 7:25 PM
Tiny
MCDANIEL30
  • MEMBER
  • 6 POSTS
Is the relay located in the rt kick panel if so is it labeled
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Monday, June 9th, 2014 AT 7:30 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
According to my manual, the fuel pump is turned on by a signal from the EFI circuit opening relay which is controlled by the EFI main relay. The location of the circuit opening relay is behind the right kick panel on the trucks. When cranking the engine, there should be 12v at the FP terminal of the circuit opening relay. I attached a picture, but question if it will show up. Check the relay that I mentioned. Make sure there is 12v to the FP terminal when cranking.

Let me know what you find.
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Monday, June 9th, 2014 AT 7:53 PM
Tiny
MCDANIEL30
  • MEMBER
  • 6 POSTS
Thank you! I will let you know what I find.
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Monday, June 9th, 2014 AT 8:02 PM
Tiny
MCDANIEL30
  • MEMBER
  • 6 POSTS
So I installed a new opening circuit relay as well as an efi main relay, still crank no start, I can hear the fuel pump humming pinned the diag port got code 12 after unhooking the battery and letting it sit, any ideas.
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Tuesday, June 10th, 2014 AT 5:14 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
A 12 is has two definitions. One is for the knock sensor and the other the RPM signal. Are you getting spark to the plugs? That code is pointing me in the direction of a possible igniter. Do me a favor. Remove the distributor cap and have a helper crank the engine to see if the rotor turns. Also, let me know if the engine sounds normal when cranking. You may even have a broken timing chain. I hope not, this engine is an interference engine.

Let me know. NOTE: If the rotor does turn, check to see if you are getting spark to the plugs.
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Tuesday, June 10th, 2014 AT 8:21 PM

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