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NO INJECTOR Pulse

Tiny
SLEDGE302000
  • MEMBER
  • 1989 MAZDA B2600
Electrical problem 4 cyl Four Wheel Drive Manual 154K miles

GOT A SMALL PROBLEM WITH MY TRUCK.I dont have a injector pulse. No matter what I try I cant seam to find the problem. Wiring checks out new module in it and pickup. Also changed the distributor computer(got 3 of those)(most parts came off a running truck that needed major motor work.)Its getting spark, changed coils to a round one it had a 4 wire 2 plug coil the one I put in it all part stores said would work I called 5 different ones and all said same thing. Changed out the wiring harness the wires were green with croasion. Im unemployed and just ran out of unemployment comp so Im broke. Spent the last few months working on truck trying all kinds of different things and nothing.I found a carb and intake for it thats a last ditch dont want to do that. At this point I can tell u what wire goes to where just by looking at it. The wire is a red wire with a wire surrounding it and a black and white wire going to the pickup and that in turns goes to the module I am so tired of being careless I cant get a job until I get it running and cant get trucking going with no money Im chasing my tail per say. If I got to check things tell where there located thanks
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Wednesday, December 23rd, 2009 AT 10:58 AM

12 Replies

Tiny
MATHIASO
  • MECHANIC
  • 1,209 POSTS
PCMs have an internal driver circuit for grounding (or in some cases energizing) the injectors. Problems here can disable one or more injectors depending on how the system is wired. In some cases, a shorted injector will kill the driver circuit in the PCM. And don't forget the power relay that supplies voltage to the injectors. If this relay dies, it will disable all of the injectors and that is here our case. First check the fuse fuel inj 30A in the fuse box.

If the fuse is good, replace the main relay. The relay is located under the dash, near the fuse box. That is the quick way to find out if the relay is bad

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit


https://www.2carpros.com/forum/automotive_pictures/46384_0900c15280076dfc_2.jpg



Check out the diagrams (Below)

Please let us know what happens.

Cheers
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Thursday, December 24th, 2009 AT 1:42 AM
Tiny
SLEDGE302000
  • MEMBER
  • 6 POSTS
Where is the main relay exactly and what does it look like. Also do u have the voltage readings on the fuel injector pulse cutout relay. Or is that the oneur talking about its under the kick panel driverside the black box that has about 10 wires or so.I have changed that relay the fuel cut out relay the fuel relay. Got all those for another truck I need to see if I can get a signal to computer or to injectors or both. Got an after market coil on it would that make a difference than the oringal. Had 2 cut end of connectors to make it work but saved enough to put back on if I had too. Can I get the voltage reading to the computer aslo so I can check every single wire for the correct voltage that to the comp and that pulse cut out relay. Ive replace wiring harness and put new fuses in fuseblock
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Thursday, December 24th, 2009 AT 12:57 PM
Tiny
MATHIASO
  • MECHANIC
  • 1,209 POSTS
The white and green wire is from the 30 A injector fuse. The 2 W/G wires goes to the relay (Main relay) It is on the wiring diagram and in the diagrams below.


https://www.2carpros.com/forum/automotive_pictures/46384_fuse_2.jpg



Relay


https://www.2carpros.com/forum/automotive_pictures/46384_relay_3.jpg



This is the relay you need. You can find it at Auto zone if the relay is replaced, the fuse is replaced and still there is no pulse to the injectors, the crank sensor might be bad. Computer relies on crank sensor signal to activate the injectors. The Crankshaft Position (CKP) sensor, located on the front cover (near the crankshaft pulley)


https://www.2carpros.com/forum/automotive_pictures/46384_cranck_sensor_1.jpg



Check the diagram below.
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Thursday, December 24th, 2009 AT 1:44 PM
Tiny
SLEDGE302000
  • MEMBER
  • 6 POSTS
Truck dont have it was born in feb12 of 89 the pic of the cranshaft sensor and the relay are not in that truck wish that was the case too easy that looked to be a 90 or newer I got 3 belts on my truck the old v belt. Dealer also said no cranksecsor on that truck every thing ran thru distribator and pickup. Try 88 I know that this will make u pull hair out if u had it. Is there a way to check the comp with jumper wires since there isnt a hand held comp to read codes
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Thursday, December 24th, 2009 AT 2:12 PM
Tiny
MATHIASO
  • MECHANIC
  • 1,209 POSTS
1989 Mazda Truck B2600I 2.6L FI 4cyl

1989 Mazda Truck B2600 2.6L 2BL 4cyl

which one is your truck?
I found also distributor on 1987-88 2.6L engine.
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Thursday, December 24th, 2009 AT 4:48 PM
Tiny
SLEDGE302000
  • MEMBER
  • 6 POSTS
Got a 1989b2600i if I cant get it running soon im changing out the injectors for a carb. Ive tried everything and neighbor is a machanic and hes just as stupt as I am. Dont want to do that want my truck as it came out of factory. Ive done everything can think plus some
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Thursday, December 24th, 2009 AT 5:24 PM
Tiny
MATHIASO
  • MECHANIC
  • 1,209 POSTS
I have send diagrams to your email, show them to the neighbor mechanic.
The diagram is correct for 1989 Mazda Truck B2600I 2.6L FI 4cyl
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Thursday, December 24th, 2009 AT 5:45 PM
Tiny
SLEDGE302000
  • MEMBER
  • 6 POSTS
Dont have a cranksensor and there is no pink wires in the harness.it does have a fuel injector cutour relay that i know of i will send a pic of that there is a module pickup the temp and other montering sensors the 3 fuse mainblock and the injector wiring plus the lights thats all thats in the motor area.u think that the cutout relay takes place of the cranksensor.if i strait wire it to the 2e and 2g pins on comp will it work. there are 2 wires that match the colors on the connector. just to see if that makes it work.u are helping alot im sorry if i am giving u a hard time


https://www.2carpros.com/forum/automotive_pictures/452833_Image005_1.jpg


this is a japan truck the newer models are ford i have done my homework on this truck i can fix anything else on this truck easy just dont know the injector system if i had anything else to drive i woulda burnt it down already
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Thursday, December 24th, 2009 AT 10:38 PM
Tiny
SLEDGE302000
  • MEMBER
  • 6 POSTS
The 2 wires I said I said wrong wrong diagram the 2 I looked at was the clutch safety switch/still u think that that might work if I did that strait wired that fuel cutout relay to the comp. At least to run a voltage test or 3. The place on my truck where the crank sensor is a oil pressure release. I finally looked at the mount where the main relay plugs into and it was corroded. So it cleaned it and it works! Thanks for hanging in there with me. I love this site.
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Thursday, December 24th, 2009 AT 11:08 PM
Tiny
MATHIASO
  • MECHANIC
  • 1,209 POSTS
Nice work, we are here to help, please use 2CarPros anytime.

Cheers
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Friday, December 25th, 2009 AT 9:06 AM
Tiny
JAMIEROSE1
  • MEMBER
  • 1 POST
  • 1991 MAZDA B2600
  • 2.6L
  • 4 CYL
  • RWD
  • AUTOMATIC
I have just completely rebuilt the motor. Now I am getting fire but my injectors are not pulsing. My fuel pump comes on and seems to be working fine. My timing is set and all wiring is right. What else can be causing the problem? Please help as this is my dad's truck. He is disabled and and fighting for disability due to car wreck two year's ago, but has no income at all and this is his only means of transportation!
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Tuesday, December 5th, 2017 AT 1:32 PM (Merged)
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Injector pulsing is via the Engine Control Unit. Did you test for battery voltage to the injectors and use a noid light to test if they are pulsing?
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Tuesday, December 5th, 2017 AT 1:32 PM (Merged)

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