The OBD port should have only 4 wires. That is normal. The fact it won’t connect to a reader is a problem. Sometimes this is caused by a bad ECU. Make sure the reader you’re using is compatible with a J1850 VPW Protocol. It’s an older protocol that newer readers may not be compatible with. Also check the EFI fuse in the fuse block under the hood. This powers the ECU and also supplies power to the OBD port.

The neutral safety switch will cause a no crank condition if it’s acting up. Usually they just need to be disassembled and cleaned.

The fuel pump only runs with the key in the START position. Then when it starts, the ECU takes control via the circuit opening relay which is in a fuse block under the hood. They do not prime with the key in the ON position like some cars. To check if the pump is working, try spraying some starting fluid into the intake while cranking. If it starts and runs for a few seconds, you know it’s not getting fuel.

Edited to correct bad info.

 

The OBD port should have only 4 wires. That is normal. The fact it won’t connect to a reader is a problem. Sometimes this is caused by a bad ECU. Make sure the reader you’re using is compatible with a J1850 VPW Protocol. It’s an older protocol that newer readers may not be compatible with. See the pic below for which positions are populated. Also check the EFI fuse in the fuse block under the hood. This powers the ECU and also supplies power to the OBD port, pin #16.

The neutral safety switch will cause a no crank condition if it’s acting up. Usually they just need to be disassembled and cleaned.

The fuel pump only runs with the key in the START position. Then when it starts, the ECU takes control via the circuit opening relay which is in a fuse block under the hood. They do not prime with the key in the ON position like some cars. To check if the pump is working, try spraying some starting fluid into the intake while cranking. If it starts and runs for a few seconds, you know it’s not getting fuel.

View attachment 493439

Ohh ok. Yeah I sprayed starter fluid and it ran for like half a sec.

 

'97 V6

 

Just checked pin 7 on DCV using pin 4 as ground. I had a reading of 0.02

 

Did you try this scan tool on another car does it connect?

 

Yeah the scan tool I got connects to other cars.

 

So, I checked the ECM box and it looks good. Fuel pump works, I sprayed starter fluid into the intake and it wants to crank, but it only goes for like half a second. Can’t scan OBDII as it doesn’t connect or transfer to scanner at all, (I saw that the Pin 7 has very low voltage 0.02-0.03.) What else can I check??? I just know that for now, the pump is not receiving any power to send fuel. This leaves me down to either a sensor, (crank, cam,) a wiring problem, or something with the timing. Can anybody help me narrow down which of the three could it be. ???

 

I sprayed starter fluid into the intake and it wants to crank, but it only goes for like half a second.

If “crank” means it runs for a bit, it simply may not be getting fuel. Try spraying starter fluid for longer to see if it runs longer.

 

What is this???

 

What is this??? View attachment 493535

It says "SENSITIVITY ADJUSTMENT" molded onto it - that's got to be a relay for the alarm system/immobilizer.
I'd wire in a bypass to cut that part out of the system, at least temporarily, and see what happens.

 

I can see a bunch of splices and other non-factory looking bodges. Look very carefully at those for problems. Wiring problems can be daunting to fix.

Have you tried starting it with a larger dose of starting fluid?

Have you checked the EFI fuse in the fuse block under the hood?

 

I’ve tried starting it with more starter fluid, but J noticed the injectors weren’t coming on. The EFI fuse works it has continuity and the relay is getting power. The only thing left is to check the wiring and the ECU. If I had to replace the ECU, do I need to reprogram it??

 

No programming is required. If you get a used one, be sure to match the 10 digit part number on your old one exactly. It’ll be 5 digits, dash, 5 digits. Like 89661-06320, for example. Looking up the possibilities for your Camry, there are 11 different possibilities. I’d look on eBay for a used one, as the odds of you finding the right one at a wrecking yard is slim.

If you pull the ECU, take the cover off and look for capacitors that have failed. Here’s a thread with some details and pics.

 

Thank you so much… I was worrying about paying for reprogram

 

That’s worrisome. Look around in that area for a same-color wire that’s also disconnected. I think they work by interrupting power to a vital component, like the ECU, injector power, etc. These aftermarket security devices are a big source of problems.

 

To be more exact, it is wire’s’, I searched up the module and the connection that is alone used to connect to the module. I saw a video that the wire in the photo should be connected to the security system module.

 

That plug dangling looks more like factory wiring, but I’m not sure what it might go to. The connectors going to the instrument cluster have that many wires, but the connectors for that look way different.

It occurred to me that black box left behind with sensitivity adjustment is probably a glass breakage sensor.

 

Ohhhhhhh that makes sense. I took the ECM out and I don’t see anything wrong with it…

 

Just saw this now

 

I was just about to mark up your pic and point that out. Yep, that’s a classic electrolytic capacitor failure. You can probably fix this for about $10 in caps. How’s your soldering skills? Read through that thread I linked earlier and get the details on what you need to do. If anything isn’t clear, just ask here.

 

Man I know NOTHING about soldering..

 

This isn’t an easy fix for a first-timer soldering. Do you know anyone who has some experience? Try googling “electronics repair” without the quotes to see if there’s a shop near you. As electronics repair goes, this a simple job that shouldn’t cost more than $50.

Or you could gamble on an eBay ECU and hope you get a good one, they can be very cheap, like $20. Or not.

 

Imma try first the electronic repair. See if they can do it.

 

Sounds good. You can source the caps on Mouser or DigiKey. I bought caps on DigiKey to preemptively replace them on my Avalon, and their shipping was very reasonable. I think the total was about $15, including shipping.

I’d recommend replacing all of them at once. The additional cost is negligible.

 

Ok. Sounds good. Imma see what to do, a friend of mine knows 2 yards that are cheap and probably have them on shelf. I haven’t found no electronic repair for auto near me. Might have to take my chances with the yard. Thank you very much for helping me. I’ll keep you updated.

 

It wouldn’t have to be a place that works on car electronics. Anyplace that routinely does soldering could handle it. Look for game repairers, classic stereo equipment, TV repair, that sort of thing.

 

Ohhh ok. Sounds good.

 

So uhhh, nobody around me did it. Had to go with a ECM on eBay. What should I do once I get it?? Do I just plug and play??

 

Yes, just plug and play.

 

I am going to replace the cv axles, how do I know if mine is plug in style inboard joint????

 

take a look at what you got under the car...

 

If they’re bolt ins, you’ll see 6 socket head cap screws at the stub shafts coming out of the transmission.

 

Ok

 

MY CAR TURNS ON, problem is that it will stall. I have 3 codes pop up P 0303 0302 0300. It will only keep going if I keep pressing the accelerator

 

The car has been sitting for 2 years, could it be old gas??

 

so this is what I did, I swapped the ignition coils, but same result. Could it be more related to the air and fuel rather than ignition. Because before swapping the coils, it did read only p0302

 

Is this with the old ECM or the (replacement) eBay ECM ?

Has the ECM been replaced yet?

 

Ok.

You could try:

1) Cleaning the Throttle Body (TB) w/ some Carb or Throttle Body cleaner,

2) Adding a bottle or two of Red HEET Dry Gas, along with some fresh fuel to the tank,

to see if that improves things. ... * No guarantees though. Your call.

 

How much gas in the tank, letting gas sit around for two years is no very good.

 

About 4-5 gallons

 

It starts and runs. Still have a misfire on cylinder 2, but it runs. Had a vacuum hose that wasn’t connected

 

So the reason it wasn't running was the vacuum line?

 

If the misfire persists and you cannot find another cause (another vacuum hose leak, etc.) - suggest "swapping" spark plugs in #1 cylinder and #2 (misfire) cylinder, and see if the misfire "follows" the swapped plug.

During the swap, you are going to want to look at: condition of plug, condition / width / gap of electrode to tip, vs. other non-misfiring plug (making sure spark plug gap looks correct), condition of porcelain insulator (no burned in carbon marks/tracking present) and condition of spark plug wire: boot & wire is intact/pliable, no evidence of carbon tracking or "snail tracks" inside boot / where it sits on porcelain insulator, wire condition / outer sheath is good, not oil soaked or dry-cracking, etc.

^^ There are bunches of "tune up" videos on YouTube that can help teach / explain above.

Some of my favorite folks to watch and learn from:
--

The Car Care Nut

Thank you for watching my Channel! My name is AMD also known as The Car Care Nut. I am a Master Automotive Technician specializing in Toyota,Lexus and Scion vehicles currently working in the automotive Industry in my own Independent Toyota, Lexus and Scion speciality repair shop ( TCCN...

www.youtube.com

https://www.youtube.com/@SouthMainAuto

Pine Hollow Auto Diagnostics

This is the official channel for Pine Hollow Auto Diagnostics, based in State College, PA. Applying the scientific method and basic principles to automotive diagnostics and repair. Most videos feature live troubleshooting of automotive drivability and electrical problems. Playlists are...

www.youtube.com

--
If the spark plugs are older than 50,000 miles, or the plug wires are old, then an ignition "tune-up" may be due, using Denso or NGK plugs and wires.

 

Alright Imma see if it changes anything.