P0753 after new TCM - Mazda3 Forums : The #1 Mazda 3 Forum
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post #1 of 7 (permalink) Old 12-09-2018, 02:19 PM Thread Starter
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P0753 after new TCM

Hi everyone, I hope someone can shed a little light on this issue, I've looked around and seen alot of posts about this issue and have tried several of the fixes mentioned.

My symptoms:
Sometimes I get the AT and CEL lights immediately after initial start - up and a shift into reverse. Bangs into reverse and then no shift past 3rd gear.

If I don't get the lights immediately upon going into reverse, or If I start the car in N and then go to D the trans will shift normally 1-2, 2-3, but on the 3-4 shift I get the AT and CEL light and a p7053 code.

Here's what I've done:
1. Replaced the TCM
2. Checked the wiring between the transaxle connector and the solenoids, at the time the resistances were on the high side of acceptable.
3. Dropped the pan and checked resistances directly at the solenoids. what mazda calls SSA was at 4.9 ohms so I replaced it. No change in symptoms.

Here's where I am confused. According to the diagram here:

sonnax.com/tech_resources/377-4f27e-fn4a-el-solenoid-identification

(sorry you're gonna have to cut and paste the link and then add the https and www stuff, forum won't let me post a link)

The solenoid that controls the 3-4 shift is what Ford calls SSA and what Mazda calls SSD. Is it possible that the 0753 code is referring to the Ford designator and not the Mazda? If that were the case I've replaced the wrong solenoid and wasted time and 4 qt of ATF.

After watching a youtube of a Ford tech replacing the Ford SSA and saying that that is a fairly common failure point I feel like I need to drop the pan again and replace the other solenoid.

Has anyone here gone down that road already?
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post #2 of 7 (permalink) Old 12-09-2018, 11:35 PM
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Originally Posted by Kurt Pfister View Post
Hi everyone, I hope someone can shed a little light on this issue, I've looked around and seen alot of posts about this issue and have tried several of the fixes mentioned.

My symptoms:
Sometimes I get the AT and CEL lights immediately after initial start - up and a shift into reverse. Bangs into reverse and then no shift past 3rd gear.

If I don't get the lights immediately upon going into reverse, or If I start the car in N and then go to D the trans will shift normally 1-2, 2-3, but on the 3-4 shift I get the AT and CEL light and a p7053 code.

Here's what I've done:
1. Replaced the TCM
2. Checked the wiring between the transaxle connector and the solenoids, at the time the resistances were on the high side of acceptable.
3. Dropped the pan and checked resistances directly at the solenoids. what mazda calls SSA was at 4.9 ohms so I replaced it. No change in symptoms.

Here's where I am confused. According to the diagram here:

sonnax.com/tech_resources/377-4f27e-fn4a-el-solenoid-identification

(sorry you're gonna have to cut and paste the link and then add the https and www stuff, forum won't let me post a link)

The solenoid that controls the 3-4 shift is what Ford calls SSA and what Mazda calls SSD. Is it possible that the 0753 code is referring to the Ford designator and not the Mazda? If that were the case I've replaced the wrong solenoid and wasted time and 4 qt of ATF.

After watching a youtube of a Ford tech replacing the Ford SSA and saying that that is a fairly common failure point I feel like I need to drop the pan again and replace the other solenoid.

Has anyone here gone down that road already?
What year and engine do you have. Did/does the fluid smell burnt.

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post #3 of 7 (permalink) Old 12-10-2018, 08:51 AM Thread Starter
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Oops, of course, the important stuff.

2006 2.3 l (auto obviously)
Fluid did not smell burnt and was still red.
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post #4 of 7 (permalink) Old 12-11-2018, 12:40 AM
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Originally Posted by Kurt Pfister View Post
Oops, of course, the important stuff.

2006 2.3 l (auto obviously)
Fluid did not smell burnt and was still red.
P0753 Is for shift solenoid A malfunction per the factory manual.

Attached a thumbnail of the wiring diagram and solenoid identification.

Higher than normal resistance on the circuit is not acceptable.

Be sure to check the ground side also.

1.0 to 4.2 ohms is the range for the solenoid. Check your meter ohms by putting the probes together and subtract it from your readings to get the actual reading of what you are testing unless you have a meter that can be zeroed out before checking resistance.

You have eliminated the TCM as a issue so that leaves the wiring or solenoid if you find you didn't replace the right one.

If everything checks out with resistance then make sure you check the harness for a short to power or ground.
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Last edited by rickkari; 12-11-2018 at 12:44 AM.
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post #5 of 7 (permalink) Old 01-09-2019, 01:42 AM
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any updates? I’m having the same problem with my 08 2.3L with same engine code. I’ve replaced all solenoids, changed fluid and it will randomly act up. I also had my TCM repaired. Today I removed the input speed sensor in attempt to test sensor’s resistance. I got 29.2 from pin 1 and 2 and 7.9 from #1 and #3. I still have to check the wiring harness but not sure exactly how to test the large connector that plugs into the TCM. Any advice?
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post #6 of 7 (permalink) Old 01-10-2019, 09:57 PM
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Originally Posted by atticus167 View Post
any updates? Iím having the same problem with my 08 2.3L with same engine code. Iíve replaced all solenoids, changed fluid and it will randomly act up. I also had my TCM repaired. Today I removed the input speed sensor in attempt to test sensorís resistance. I got 29.2 from pin 1 and 2 and 7.9 from #1 and #3. I still have to check the wiring harness but not sure exactly how to test the large connector that plugs into the TCM. Any advice?
Posting the 2 PM messages I sent you so others can see my responses and get helped or chime in and add to or correct something I've said:

1-
I assume you changed the solenoid pack in the pan and not the one on the side. Normally the issue with P0753 is the TCM, solenoid or wiring/connector.

If you changed the solenoid and still have an issue, then it is most likely something else. Looking on Mitchell prodemand at work, there are more fixes associated with the TCM than the solenoid. That said, it could be an intermittent electrical circuit issue with the wiring or the 3 related connection points of that circuit. I would verify that they are good. If they are good then it sounds like a TCM issue. I would definitely rule the circuit issue out first as $450 is a big price to throw parts at it.

As for the speed sensors, they wouldn't cause this specific issue. If they were bad then you would have a more broad symptom base as they effect the whole transmission and shouldn't cause a specific solenoid cause.

The only other thing not mentioned in the service manual is the possibility of a hydraulic issue in the valve body solenoid block that is intermittently not allowing proper ATF flow when the solenoid is energized (sticking valve, debris, etc...). Not usually common though. Just throwing it out as a possibility.

2-
You might be able to find some youtube videos that demonstrate how to check the circuits and connectors and may have examples of what to look for.

The short of it: Most connector inspections are generally visual. Check for bent or deformed or corroded male and female pins and terminals. Make sure the terminals are tight enough to actually maintain contact on the inserted pins. If not, vibration and moving of harnesses under engine torque can cause loose connections.

To actually check the circuit, you would unplug the connectors at the TCM and transmission and check for continuity to ground and power to see if there is any kind of short to either. To check the circuit itself for resistance, I usually use a brake light bulb connected at one end of the circuit and a ground and apply battery voltage to the other end of the circuit with a jumper to the battery. This will complete the circuit and should light the bulb normally. Any resistance will cause a dim or no light based on the amount of resistance. I do this because a circuit that has no resistance on the meter may still not be able to carry a real world load. This is because a meter sends a vary small voltage through it. Most of the time it is a fair assessment, but I have been burned by it in the past therefore I like to verify with a real bulb. Hope this makes sense.

Also, there is no way to test a TCM or any module directly with the ohm part of the meter as that will fry it. You can check it with a the voltage part:
With the vehicle assembled normally, insert a backprobe into the transmission connector circuit for solenoid A. Have meter on DC volts and connect the positive lead to the probe and the negative lead to ground. Drive the vehicle and you should see 12 volts on the meter when the TCM energizes the solenoid. Driving like this when it acts up will tell you if the ECU is turning on the solenoid like it is supposed to. If it is and the circuit is good, then you should be OK with the TCM and it is probably a hydraulic issue. At this point though, you would want to pull the pan first and verify that it isn't the internal wiring between the trans connector and solenoid plug.

Hope this all makes sense.
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post #7 of 7 (permalink) Old 02-23-2019, 12:20 AM Thread Starter
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Thanks for the replies! I apologize for taking so long to reply, I was out of the country for work with almost no internet access for over a month.

My situation right now with this problem:

0753 code has gone away! I am not celebrating yet though.

Thanks to rikkari's excellent diagrams and further googling I was able to check continuity through the wiring harness from the TCM connector all the way to the solenoid in the pan. I discovered a loose socket in the transaxle connector at the top exterior of the trans. A few minutes with a pick and I was able to get it to make reliable contact again.

That being said, the trans still goes into limp mode immediately upon shifting into any gear. The AT light comes on and the CEL throws 0758 and 0763 which are shift solenoid b and c electrical codes respectively.
What I've done to this point on the new issue:

1. Used the same procedure on the SSB and SSC sockets on the transaxle connector to tighten the sockets.
2. Checked resistance to both solenoids, they were both within spec. There was no offset on my meter when the probes were touched together.
3. Sent 12v down the wiring harness from the TCM connector and heard Solenoids A, B, and C click.
4. Checked that the TCM was receiving 12v on pin J of the TCM connector. It was.
5. Checked that the TCM had ground on pins L and M of the TCM connector.

What have I missed?
I'll try backprobing pins AL and AJ on the connector when I have another chance.
I still can't post links so I'll just have to say that I googled "Mazda 3 service manual" and found the TCM inspection section in there, it has a complete pinout of the TCM connector.
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