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Old 09-23-2008, 06:47 PM   #1
nivlem7
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Default P0702 - can't seem to find any info...

I'm getting a P0702 "Transmission Control System Electrical" code, and can't seem to find much info on what the problem could be. I don't notice any symptoms.

I only noticed it because I replaced the fuel filter with OEM because I kept getting a P0172 -too rich condition - code, and found that the pressure at the fuel rail was 72 psi! After the OEM filter (thanks, OldNuc!), the fuel pressure stayed at 50 psi. After the replacement, I re-scanned. Since I'd been planning this for a while, I had'nt scanned for new codes for a few weeks, since I assumed the intermittent SES was from the too rich mixture again.

The SES did go out today, but both the codes remained. I erased them to see if they come back.

Anyway, I was just wondering if anyone could fill me in on what this new code means/is related to.

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Old 09-23-2008, 07:46 PM   #2
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Default Re: P0702 - can't seem to find any info...

P0702.

DTC P0702 is set when the PCM has detected the following conditions:
  1. Engine is running one minute
  2. Voltage to all five solenoids, monitored at terminalsJ4A02, J4A03, J4A05,J4A06, and J4A07 on the PCM, below 0.9 volts.
  3. Ignition voltage above 9.5 volts.
This looks to be mainly caused by a dirty connection at the Black 10 way connector on the transmission solenoids. the common point in all of this is the fuel pump relay. The FP relay feeds the 3 transmission fuses in the UHJB as well as the fuel pump. I would clear the 702 code and hope it never came back. If it does the feed circuit is B2 in the black 68 way connector in the I/P Junction Block. It is a red wire and should read ignition voltage.

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Old 09-24-2008, 05:46 PM   #3
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Default Re: P0702 - can't seem to find any info...

Quote:
Originally Posted by OldNuc View Post

This looks to be mainly caused by a dirty connection at the Black 10 way connector on the transmission solenoids. the common point in all of this is the fuel pump relay. The FP relay feeds the 3 transmission fuses in the UHJB as well as the fuel pump. I would clear the 702 code and hope it never came back. If it does the feed circuit is B2 in the black 68 way connector in the I/P Junction Block. It is a red wire and should read ignition voltage.
Hmmmm....

I removed the fuel pump relay and started the car to bleed the fuel pressure before removing the old filter. Perhaps that was what initiated that code?

The codes have not returned today after about 70 miles.

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Old 09-24-2008, 05:48 PM   #4
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Default Re: P0702 - can't seem to find any info...

Well, as a matter of fact it did. That is the best way to set that code other than pull off the connector on the transmission. Pull the PCM B fuse and clear it.

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Old 05-13-2012, 05:40 PM   #5
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Default Re: P0702 - can't seem to find any info...

OldNuc

BLESS YOU!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!

my brother and I just bought a 2001 SL1 for 500 bones with this P0702 Code.

Swapped the fuel pump and HVAC relay and now it has all the gears with lock up.

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Old 05-13-2012, 06:25 PM   #6
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Default Re: P0702 - can't seem to find any info...

And the seller though he took advantage of you, I bet...

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Old 05-13-2012, 06:38 PM   #7
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Default Re: P0702 - can't seem to find any info...

It still needs a radiator and t-stat.

Also still has two trans codes one is shift timing something and another deals with lock up clutch. Don't remember exact numbers. Old is bad smelling from being in limp mode flashing the torque converter. Changing oil and filter and see what happens.

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Old 05-13-2012, 08:55 PM   #8
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Default Re: P0702 - can't seem to find any info...

Get code numbers. Might be an easy fix.

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Old 05-13-2012, 09:17 PM   #9
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Default Re: P0702 - can't seem to find any info...

Tomorrow when my brother gets off work. He has them in the Mac Mentor/ OTC Geneiss.

The mentor doesn't like talking to the tranny side of the PCM. I don't think the PCM is OEM. It's got a white sticker on it saying PCM automatic.

I post them tomorrow.

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Old 05-13-2012, 09:27 PM   #10
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Default Re: P0702 - can't seem to find any info...

And I should start another thread.

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Old 05-13-2012, 09:39 PM   #11
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Default Re: P0702 - can't seem to find any info...

Quote:
Originally Posted by 1996SL11.9L View Post
Tomorrow when my brother gets off work. He has them in the Mac Mentor/ OTC Geneiss.

The mentor doesn't like talking to the tranny side of the PCM. I don't think the PCM is OEM. It's got a white sticker on it saying PCM automatic.

I post them tomorrow.
That is supposed to be there along with 2 sets of numbers. Yellow paint pen is the tip off of a transplant. Verify the vin in the PCM against the car while you are at it.

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Old 05-14-2012, 09:21 AM   #12
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Default Re: P0702 - can't seem to find any info...

No grease pencil on PCM. But trans cover has a shadow of a number written on it.

First thing we did was western union the butt splices in the replacement trans connector. 3 of the them the wires pulled out.

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Old 05-14-2012, 10:25 AM   #13
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Default Re: P0702 - can't seem to find any info...

And that is why they don't last in an automobile. They happen to make uninsulated butt crimp connectors and they make very good solder sleeves for making proper splices that are not 5 times the size of the rest of the wire.

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Old 05-14-2012, 11:30 AM   #14
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Default Re: P0702 - can't seem to find any info...

That is what I use. Uninsulated crimps tha are crimped and soldered and shrink-tubed.

My brother had none at his place.

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Old 05-14-2012, 01:40 PM   #15
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Default Re: P0702 - can't seem to find any info...

Sharp knife strips off the little plastic tube and then you have one.

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Old 05-24-2012, 10:18 PM   #16
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Default Re: P0702 - can't seem to find any info...

Well after replacing the rad and both trans cooler lines it came back.

Put brand new relay in and still bad. Brother tried removing connector in trans cover and bolt spins and thats all. On top of that after cranking around on that and looking for issues with the harness it seems that the problem is gone again.

At the very least the trans side of the connector / trans side of the harness needs replaced. I have a dead trans I was going to ideas a core I'll give him the cover and harness and see it that fixes it.

Their was a wrecked 01 sl1 on Craig's list that he's getting some body pannels off of. I think he also going to grab the entire engine harness. He talked about it anyway.

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Old 05-24-2012, 10:47 PM   #17
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Default Re: P0702 - can't seem to find any info...

All you need to fix the spinning bolt is a new bus plate which is a swappable part in the valve body and defective connectors and bus plates are a known high failure part. As this is an intermittent problem I would extract a bus plate from a VB and go from there. The bus plate solenoid connections tend to go weak and then the fun starts.

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Old 05-24-2012, 11:01 PM   #18
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Default Re: P0702 - can't seem to find any info...

Will do. I've been itching to pull the cover off the dead trans for two years now. When I got the 96 it came with the 3rd gear ratio code and the over temp light was on. Now I can start the process of finding out if it's worth fixing.

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Old 05-24-2012, 11:40 PM   #19
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Default Re: P0702 - can't seem to find any info...

Pay attention to the location of the bus plate bolts.

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Old 05-25-2012, 12:35 AM   #20
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Default Re: P0702 - can't seem to find any info...

Quote:
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Pay attention to the location of the bus plate bolts.
Ok I need to pass this info to my brother I just started my work stretch.

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