LQ4 swap issues

[Jetmech442]

99.6 during what condition? When I key on engine off (koeo), the ecm command shut. I would think that means close to zero, but I'll try and grab a quick scan tomorrow to verify.

Can't remember, did you say you replaced the tps sensor already?

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[Red Alert]

KOEO, yes. I have not replaced anything but the pedal sensor which did not change anything that I can see.

[joecar]

This code reader is not giving me the info that I need, but it does say that the TPS is at 99.6%? Dunno what that means

You could use the EFILive scantool to read sensors and DTC's.

[Red Alert]

You could use the EFILive scantool to read sensors and DTC's.

New to this, how do I go about using this tool?

[joecar]

Start V7 scantool, then do this:
- File->Connect, should see Connect button go dim and Disconnect button go red.
- Might have to go File->Select Controller and choose your PCM/ECM.
- Might have to go File->Enter VIN and enter your vehicle's VIN.
- Go Info->Validate Pids, wait for it to finish.
- Goto PIDs tab.
- Uncheck Supported.
- Set System to All.
- Select (double click on) some pids, include GM.ETCTP and GM.APP (you will have to select some others, i.e. play with it).
- Make sure your selected pids do not have a red X (if they do, on those pids go rightclick->More info to see why).
- Goto Dashboard tab, goto subtab B.
- If you don't see your pids on the dash B charts, goto a corner of one chart strip, do rightclick and choose the pid you want in that corner (e.g. ETCTP).
- Click the red record button at bottom of window.
- Goto Data tab to see logging data.
- Goto Dashboard tab, goto subtab B, you should see chart waveforms updating.

Then for OBD-II data, stop recording, and go Info->Diagnostic Trouble Codes.


( BTW: there is a V7 scantool user manual pdf that you should work your way thru )

[Red Alert]

Thank you joecar

Out of curiosity we drilled the rivets out of the factory TPS, pulled the switch off the throttle motor and we found water in there. The large gear is rusting, and looked like large droplets of water were sitting in the inside of the switch. I took an air hose and blew the switch out, smelled musty and water did come out of the switch cavity, by the way is sealed. Think this was the issue?

I ordered a new TPS, will be here tomorrow via AMazon (Dorman part)

[joecar]

Yes, I think your TPS is bad due to water damage.

$0.02

[Jetmech442]

Geez, that's a good find red alert. Not sure I would have had the guts to drill out rivets and check. Should go a lot smoother for you now hopefully.

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[Red Alert]

Thanks, i olny did that due to your suggestions on this site Plus I hve been working on cars for 30+ years, not much scares me anymore

I did replace the TPS and voila' we have throttle I took it for a short drive, engine runs good, throttle response is right where it should be.

Ahh, feels great to solve this one, I was just about to hit my head on something, I felt defeated for a while...

BUT, there i always one, I still have codes I need to solve before really driving this car because the trans is not shifting:
0758-shift solenoid B
0753-shift solenoid A
2761-Converter lockup

All sound complicated, but I am not afraid to dive into the trans again as I have already have had it all apart converting it to a 2WD from 4WD.
Any guidence here? I do have voltage at all pink wires in the harness at the connections down at the trans.

[joecar]

Thanks, i olny did that due to your suggestions on this site Plus I hve been working on cars for 30+ years, not much scares me anymore

I did replace the TPS and voila' we have throttle I took it for a short drive, engine runs good, throttle response is right where it should be.

Ahh, feels great to solve this one, I was just about to hit my head on something, I felt defeated for a while...

+1 not scared of much anymore... it's just that anything takes a lot of time (remove A to get to B, remove B to get to C, remove C to get to D...).

Good job

BUT, there i always one, I still have codes I need to solve before really driving this car because the trans is not shifting:
0758-shift solenoid B
0753-shift solenoid A
2761-Converter lockup

All sound complicated, but I am not afraid to dive into the trans again as I have already have had it all apart converting it to a 2WD from 4WD.
Any guidence here? I do have voltage at all pink wires in the harness at the connections down at the trans.

Make sure wiring has continuity and good connections (zero voltage drop)(may have to test live with piercing probes; fill holes in with lacquer), check connector terminal pins for contact.