SOLVED: Crank but no start 07 Sequoia

Have an issue that has me completely stumped, my 07 Toyota sequoia sr5 2wd is having a crank but no start issue. The truck has over 200k and just got the timming belt/ water pump done at the dealership, and ran fine for a couple weeks, I'll list the symptoms and what I've done so far

Engine cranks but no start, will continue to crank when let go of key have to turn the key to stop cranking, dont hear fuel pump engage, no cel, no power going to fuel pump wire.

I've replaced and checked all fuses and relays, and replaced the fuel pump, and the crank position sensor, still nothing, I have 3 ideas of what it could be, 1 bad starter solenoid (I really hope it's not this bc the starter location but think it's still good bc the starter still engages), 2 ignition switch, 3 computer. Thanks for reading hope I can get this solved, will respond and update.

 

Do you have an aftermarket security sysyem?

 

No nothing like that

 

I think your guesses #1 and #2 are potentially not it, and I doubt the 3rd is it, but it is weird that it won't stop cranking.

Does it start using starter fluid? This is the #1 question to ask. If it does, this is probably a fuel delivery issue.

Do you live in a place where mice are common? Have you checked for chewed wires above the tank, at the pump? They also like crawling in the cubby where the starter is. They like the soy-based wiring sheaths and such.

If it won't fire with starter fluid, have you checked for spark?

Have you tested for fuel pressure yet?

Stupider question, have you had the battery tested at the LAPS yet for voltage, good cells, CCA?

This video covers diagnosing fuel pump/startup issues. It's not perfect, and it pertains to the earlier 1st Gen platform so the fuel pump as installed is slightly different, but the steps are valid to diagnosing if you haven't already tried.

https://www.youtube.com/watch?v=VoerlgT8pck

 

I'll check out that video, but haven't used starter fluid, and haven't checked fuel pressure assuming it's 0 since the pump isn't on, I also haven't checked spark, and yeah the continuing to crank is whats really confusing me I'll try to get it on video

 

Battery in the key FOB? If its low enough on voltage that the FOB can't complete the "handshake" then the engine can crank but not engage as part of the anti-theft system.

Do you have a spare key with FOB you can try?

 

Pump doesn't turn on until/unless:

• the wiring for the fuel pump is intact, it sometimes gets chewed by rodents
• the key is turned all the way forward to START position - it does not turn on nor stay on with the key in the "ON" position
• the fuel pump relay passes power to the fuel pump to engage (this is tied to the ignition switch)
• the fuel pump resistor is working correctly and not interrupting the circuit somehow

The fuel pump doesn't stay running unless the crankshaft position sensor is getting a good, valid reading indicating it's on.

Use the video supplied to troubleshoot the fuel pump. Try some of the things suggested in the video. Like, if you jumper the fuel pump on at the relay, you should hear it kick on, if not, you have a problem.

If I remember right, there are at least 3 components of the fuel system that can go bad which will stop the fuel pump from coming on and staying on:

• Fuel pump resistor - on older trucks, it's the silver finned thing on top of driver side fender, under master cylinder, on newer trucks, it's the silver finned thing on top of passenger side fender, next to the power steering reservoir
• Crankshaft Position sensor (not to be confused the camshaft sensor) - you said you already verified wiring and tested it, I think

Review the fuel pump circuitry to understand how the fuel pump works, since these 1st gens work different than other vehicles you may've dealt with in the past.

Here's another video to help troubleshoot ignition/startup that's worth watching:

https://www.youtube.com/watch?v=0jWouSQYTnU

 

No antitheft system on pre-2007 trucks and pre-2008 Sequoias AFAIK. This is a 1st gen problem, posted in the 1st gen forum. Don't send OP down a rabbithole

 

I perhaps should have used the term "immobizer." I believe compulsory on new vehicles beginning in 1998.

 

We've never had anyone at the forum deal with communication issues with the RS3000 or RS3200 which prevented a vehicle from starting. But we also don't deal with Sequoias a ton.

@empty_lord is the resident mech. He says over here, there is an immobilizer function for Sequoias specifically. I know it's a T4R thing using RS3000, I haven't heard of it in 1st Gen Tundras. OP's vehicle would be using the RS3200 and I'm finding multiple places online that immobilizer wasn't an option until the 5.7L engine'd trucks.

But that may be wrong too. I still suspect this is a fuel delivery issue. A quick fuel pressure test would confirm. Hell, proper use of starter fluid or any number of fuel relay jumps would probably confirm. So would piping a little gas in each cylinder.

 

Check wires to the crankshaft position sensor. If the timing belt was just done I’d be weary of that. People Do route them wrong and the belt will eat the harness


The truck likely has an immobilizer too. But less likely of an issue given what was just done

 

Good idea I'll check continuity in the pump and CKP sensor wires, also the vehicle was a salvage title and keys look new (for a 200k Toyota) and no fob, but I'm not ruling anything out at this point, I'll update tomorrow

 

Check for wire looms around the serpentine up front. From top and bottom.

 

Hmmm....

 

Oh and crank position sensor is here (see below), I'll find a picture of what damage you'll be looking for in a few.

 

Here you go - This harness leg tends to not get tucked away properly after timing belt. Crank position sensor is required to keep fuel pump running as mentioned before.

https://www.tundras.com/threads/the-professional-hand-model-reinvestment-‘build’-a-chronological-story.46816/page-7#post-1885894

 

@empty_lord and @shifty` beat me to it. Have a buddy with a 2UZ Lexus and the mechanic who did his timing belt misrouted the crank sensor. This prevented spark, which I confirmed was a signal issue for the plug packs with an o-scope. We found the wire's jacket eaten through and was being grounded on the block.

 

Yea no crank single, no fuel or spark.

 

Okay so I solved the problem, and it was an easy one. I had no idea this toyota needed a transponder key to start, I've only owned 90s toyotas/ lexus that will start with blank keys. I feel really stupid for not knowing this but the fact it would still crank with the blank key had me so confused. TundraMcGov. had the right idea, thanks guys sorry it was such a stupid issue

 

At least it was an easy fix!

 

Must just be a Sequoia or '07 thing? I know my '06 Tundra doesn't use transponder keys and it's loaded. We've had the conversation before, and every time, nobody has a transponder key. Weird.

Thanks for the update, @ToyotaHoopty, just another morsel in the Tundras.com KB.

 

Double cabs and sequoias do


Access and reg never got them

 

Aaaaahhh. Just another nod to the fact the DC and Sequoias are twinsies, one with bed, one without.

 

Our 02 Sequoia has this, but none of the 3 DC's I have owned have had it. I have never had a Limited DC so maybe it's a limited thing?

 

Yes very weird especially for a sr5 not even limited, and the keys aren't factory and it was a rebuilt title so probably just hoopty problems

 

My 2006 Double Cab Limited does not have a transponder key. I have two spare duplicate keys that cost less than $2 at the hardware store.

 

Really? Must of been an option or something

 

This is what someone on TS was suggesting. That there was an "immobilizer" option in earlier years.

 

I still have a valet key for my 06 DC Limited and the rear seat remote. The valet key will unlock the drivers side door and start the truck but will not unlock the glove box.