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96 tacoma 2.7 runs but shuts off after ignition is inthe on…

Customer Question
96 tacoma 2.7...

96 tacoma 2.7 runs but shuts off after ignition is inthe on position what tells the circuit open relay to stay closes?

Mechanic's Assistant: How many miles are on the car? Has the car been starting normally?

Set for a bit. Wires at pump were chewed into but fixed them was told crankshaft sensor feeds it . 175000 miles

Mechanic's Assistant: Are you fixing your Tacoma yourself? What have you tried so far?

Yes started fine when parked

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

That should do it . It will run just fine if I close relay by hand.

Submitted: 5 months ago.Category: Toyota
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Answered in 6 minutes by:
11/22/2017
Toyota Mechanic: david craig, Auto Mechanic replied 5 months ago
david craig
david craig, Auto Mechanic
Category: Toyota
Satisfied Customers: 5,178
Experience: owner/mechanic at 3D Automotive
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Hi my name is ***** ***** I'll be more than happy to assist you. Please allow me a few minutes to review your information. Thank you

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Toyota Mechanic: david craig, Auto Mechanic replied 5 months ago

it shuts off when releasing the key?

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Customer reply replied 5 months ago
Runs for a second but loses power to relay
Toyota Mechanic: david craig, Auto Mechanic replied 5 months ago

ok, standby please

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Toyota Mechanic: david craig, Auto Mechanic replied 5 months ago

auto or stick?

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Customer reply replied 5 months ago
Stick
Toyota Mechanic: david craig, Auto Mechanic replied 5 months ago

ok, allow me a few minutes, thanks

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Toyota Mechanic: david craig, Auto Mechanic replied 5 months ago

thanks for your patience.

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Customer reply replied 5 months ago
Im still not seeing what takes over after start relay tells open relay to close
Customer reply replied 5 months ago
Still not seeing what takes over after start relay
Toyota Mechanic: david craig, Auto Mechanic replied 5 months ago

the ecm takes over as long as its seeing rotation and the correct voltage. it keeps the c.o.r. latched as long as the efi relay is closed

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Customer reply replied 5 months ago
Correct voltage from what?
Customer reply replied 5 months ago
Crankshaft sensor?
Toyota Mechanic: david craig, Auto Mechanic replied 5 months ago

thru the starter relay. then the ecm takes over and keeps the relays latched.

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Customer reply replied 5 months ago
Ok
Toyota Mechanic: david craig, Auto Mechanic replied 5 months ago

it sees the rotation from the crank sensor and then it takes over

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Customer reply replied 5 months ago
Can i ohm the sensor and how its a three wire
Toyota Mechanic: david craig, Auto Mechanic replied 5 months ago

you can test the sensor. unplug it, check for power and ground. if thats good, plug it back in and backprobe the signal wire and check the voltage while cranking the engine

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Customer reply replied 5 months ago
Voltage should be 12?
Toyota Mechanic: david craig, Auto Mechanic replied 5 months ago

let me get you a diagram

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Customer reply replied 5 months ago
Why is that only showing a two wire?
Toyota Mechanic: david craig, Auto Mechanic replied 5 months ago

standby

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Toyota Mechanic: david craig, Auto Mechanic replied 5 months ago

what sensor are you looking at? its a 2 wire sensor

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Toyota Mechanic: david craig, Auto Mechanic replied 5 months ago

give me the vin please

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Customer reply replied 5 months ago
Crankshft sensor
Toyota Mechanic: david craig, Auto Mechanic replied 5 months ago

the third wire is spliced in with the cam sensor.

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Customer reply replied 5 months ago
4TAPM62N7TZ126723
Toyota Mechanic: david craig, Auto Mechanic replied 5 months ago

just check the sensors resistance please

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Customer reply replied 5 months ago
Resistance fine cam sensor is part of distributor
Toyota Mechanic: david craig, Auto Mechanic replied 5 months ago

yes i know that

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Toyota Mechanic: david craig, Auto Mechanic replied 5 months ago

im going to open this up to the others, I have to close up my shop. I dont want you eaiting on me.

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Customer reply replied 5 months ago
Not being ass just lot of different articles say cam sensor tells cor to close
Toyota Mechanic: Ted Ritter, Toyota Master Tech replied 5 months ago
Ted Ritter
Ted Ritter, Toyota Master Tech
Category: Toyota
Satisfied Customers: 4,601
Experience: Toyota Master Tech, ASE Certified
Verified

H​ello, what the other expert was telling you is correct, the computer keeps the COR closed after the engine starts but only if the EFI relay is functioning correctly which I assume is the case, the ECM keeps the COR closed by grounding the green/yellow wire as long as it sees all the input signals necessary, even if spark is lost it will open the relay, yes a cam or crank sensor can cause this as well. instead of ohm testing which is time consuming why don't you try to rent or borrow a code reader or even buy one, they are some for about $30 or so and see what diagnostic codes are in the ECM, if it's missing a signal it will give you a code number and then you can go from there. Reply here if you need any help in dealing with the code number and I'll be glad to offer any advice to help.

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Customer reply replied 5 months ago
Ok no problem but no check engine light was just tryin to figure where ecm got info to keep cor closes and my crankshaft position sensor is three wire from sensor just a little confusion
Toyota Mechanic: Ted Ritter, Toyota Master Tech replied 5 months ago

T​hanks for the reply, let me check on that, it should actually only be two, be right back.

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Toyota Mechanic: Ted Ritter, Toyota Master Tech replied 5 months ago

The crank position sensor is located on the timing cover right next to the crank pulley and has two wires going up to a connector.

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Customer reply replied 5 months ago
Ok looking at the front of engine right side pulled crank sensor right behing alternator has three wires dont know whats goin on will send pictures later
Toyota Mechanic: Ted Ritter, Toyota Master Tech replied 5 months ago

Ok, let me know what colr those wires are.

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Customer reply replied 5 months ago
Ok tomorrow
Toyota Mechanic: Ted Ritter, Toyota Master Tech replied 5 months ago

Sounds good

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