Still can't start my 3.3L conversion

[914helo]

OK, I checked pretty much all the ECU pinouts for voltages and found a few oddities. First I think there is a printing error in my pinout because it says the ECU B60/11 goes to the air flow sensor, but on the flow diagrams that wire leads to the vehicle speed sensor.
Weird voltages: My bypass air control solenoid valve (or IACV) says that B62/2 &1 should be 7 and 6 volts repsectively. Mine were 14 and 1.42. That should screw up some idling but I would think not prevent my engine from starting.
Secondly, my fuel pump discharge flow control was reading the full 14V with the ignition switch on. This is probably because I'm using the fuel pump relay, but not the fuel pump modulator.
Third, my water temp sensor, engine coolant temp sensor, pin on the ECU was reading 3.68V. This sensor is brand new and the pinout says it should read 0.7-1.0V after warm-up. I'm attributing my high reading because the engine is cold?
Fourth, and what I'm looking at first is my grounds. The injectors grounds (B62/24&25) read .07V. The grounds for my sensors (B59/21) and control systems (B59/11&22) are .01V. That sounds fine doesn't it? The ground for my ignition system was 0. I know that's basically the same, but it just seemed like the circuit wasn't grounded since all the others registered something. The other weird thing was that pin B59/14 on my pinout shows that's the ground for the body. My ECU has no wire leaving that pin; it's empty! Can anybody else verify their ECU has a wire going into pin?
Thanks again.

[b3lha]

Originally Posted by 914helo

OK, I checked pretty much all the ECU pinouts for voltages and found a few oddities. First I think there is a printing error in my pinout because it says the ECU B60/11 goes to the air flow sensor, but on the flow diagrams that wire leads to the vehicle speed sensor.

You are right, there is an error pinout from the factory service manual. B60/11 is vehicle speed sensor #2. It should read B59/11 for the MAF. The other three MAF wires are B60/4,5 and 6.

Originally Posted by 914helo

Fourth, and what I'm looking at first is my grounds. The injectors grounds (B62/24&25) read .07V. That sounds fine doesn't it? The ground for my ignition system was 0. I know that's basically the same, but it just seemed like the circuit wasn't grounded since all the others registered something.

These pins should be wired to the ground side of the battery. I don't understand how can they ever read more than 0v?

As you know, the injector circuit runs from the ignition live to the + side of the injectors, then from the - side of the injectors to the ECU pins B62/13,12,11 & 26 and B59/1 & 12 respectively. Then out of the ECU on pins B62/24&25 to the - of the battery.

When the ECU wants to fire the injector #1 it internally connects B62/13 to B62/24 (and/or 25?) to complete the circuit.

Do you have the wiring diagram or do you want me to scan it for you?

[914helo]

b3lha, thanks for the help and explanation. It sounds like I may have a grounding issue. I checked the ground on the engine last night and it was clean and secure. It is the one at the rear of the engine block on the passenger (right) side. When I get home from work today I will trace all those grounding wires to make sure they are grounded. I also have another ground from transmission to the chassis, and obviously from the battery to chassis. My wiring harness is still a mess and the extra grounds I have together with my tranny ground. Maybe I missed a ground?
I have the ECU pinouts and printed off the electrical pages from this website showing the wire colors and flows. I'm assuming that's what you are looking at also. If you have anything else I'd love to see it.
Thanks

[huck369]

Did you ground the ECU case?

[914helo]

Huck, no I haven't grounded the ECU case because I've got the engine out of the car and trying to get started. Hmm? How is it grounded in the car? Just by the 3 bolts? I'll have to try that. Thanks!

[huck369]

Kent,
yes it's grounded in the car by the mounting points...
If it's not grounded, and your "Grounding Pin" is empty, this may be the root of the problem...

[914helo]

Well, I added a ground for the ECU and still the same. At least my injectors ground now registers .03V instead of .07V. I'll keep looking at grounds to see if I'm missing something else...

[TomsSVX]

Originally Posted by huck369

Kent,
yes it's grounded in the car by the mounting points...
If it's not grounded, and your "Grounding Pin" is empty, this may be the root of the problem...

I have run my car with the ECU dangling by the wires for dyno runs with no issues I don't think the case is actually grounded.

The problem is, your ECU is in self-check mode if all the solenoids and relays are clicking when you turn the key forward. I would figure out why this is before you do anything else.

Tom

[914helo]

What would trigger the ECU to go into self-check mode? I will go over my wiring again tomorrow. Thanks

[TomsSVX]

only way I have ever had it happen was if you have both pins in the check terminal, it will make fans go balistic, everything goes off.

Tom

[b3lha]

Maybe this will help.

[914helo]

Thanks for the other diagram. I just don't know. I've looked over and checked everything again.

[914helo]

When you ground both of the blue pins in the diagnostic connector it goes into self-check mode. It does appear to be doing that without grounding the pins. When I checked for voltages with a fully charged battery (14V) I was only reading 4.69V at both of these connectors. My ECU wiring pinout says that they should be at 5V. Maybe the 0.3V I'm missing is making the difference???

[b3lha]

Originally Posted by 914helo

When you ground both of the blue pins in the diagnostic connector it goes into self-check mode. It does appear to be doing that without grounding the pins. When I checked for voltages with a fully charged battery (14V) I was only reading 4.69V at both of these connectors. My ECU wiring pinout says that they should be at 5V. Maybe the 0.3V I'm missing is making the difference???

The 0.3 volts wouldn't make a difference. The digital electronics see these wires as being "grounded" or "not grounded". There is no way it is going to think 4.69v is "grounded". Unless it is missing the ground that it compares to when deciding whether the wires are grounded. In that scenario it wouldn't know what voltage level "ground" is at. IF your ECU is definitely in self check mode then maybe you are missing a ground somewhere.

[914helo]

Some of my grounds are reading around .01V, but that should be good enough. The only ground I appear to be missing is the B59/14 ground to body. I do have the ECU case grounded now. Maybe I'll add a ground into the empty body ground pin on the ECU?
Thanks for bearing with me and all the suggestions! I've looked at it so many times it's nice to have a set of fresh eyes.