TCC failing on 2005 Grand Am 6 cylinder. already changed out filter adn fluid and replaced #1 and #2 solenoid. Want to disconnect the TCC - need a wiring diagram. Thanks! Car is NOT stalling out - struggles to shift when cold unless I drop down to 1 and 2. And TCC pushes rpm up a couple hundred after cruising at 55 mph for about 10-15 minutes. Where is the darn wire located?

You replaced the TCC solenoid , but did you test the electrical circuit ? Code description - DTC P1860 TCC PWM Solenoid Circuit Electrical. - YOU SEE SOLENOID CIRCUIT ELECTRICAL - no where does it say to replace the solenoid . TEST THE ELECTRICL CIRCUIT ! P0306 should set right away if misfire is present . P0306 cylinder # 6 misfire !
The TCC PWM Solenoid Valve controls the fluid acting on the converter clutch valve, which then controls the application and release of the TCC. The solenoid attaches to the control valve body within the transmission. Circuit 439 supplies ignition voltage directly to the solenoid. The PCM controls the solenoid by providing a ground path on circuit 418. Current flows through the solenoid coil according to the duty cycle (percentage of ON and OFF time). The TCC PWM Solenoid Valve provides a smooth engagement of the torque converter clutch by operating during a duty cycle percent of ON time.
When the PCM detects a continuous open or a short to ground in the TCC PWM circuit or the TCC PWM Solenoid Valve, then DTC P1860 sets. DTC P1860 is a type A DTC.
Diagnostic Aids
?€¢
Inspect the wiring for any poor electrical connections at the PCM. Inspect the wiring at the transmission 20-way connector. Look for the following conditions:

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A bent terminal

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A backed out terminal

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A damaged terminal

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Poor terminal tension

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A chafed wire

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A broken wire inside the insulation

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When diagnosing for an intermittent short or an open condition, massage the wiring harness while watching the test equipment for a change

2

1. Install the scan tool.
2. With the engine OFF, turn the ignition switch to the RUN position.
Important: Before clearing the DTCs, use the scan tool in order to record the Freeze Frame and the Failure Records for reference. The Clear Info function will erase the data.

3. Record the DTC Freeze Frame and the DTC Failure Records.

Are DTCs P0753, P0758, P1860, P1864, or P1886 set?
--
Go to Step 3
Go to Step 4

3

Inspect circuit 439, the solenoid, the PCM IGN fuse, and the Automatic Transmission Wiring Harness for an open or a short to ground.
Refer to Electrical Diagnosis, Section 8.
Did you find and correct a problem?
--
Go to Step 17
--

4

1. Turn the ignition switch to the OFF position.
2. Disconnect the transmission 20-way connector (additional DTCs may set).
3. Install the J 39775 Jumper Harness on the engine harness connector .
4. With the engine OFF, turn the ignition switch to the RUN position.
5. Connect a lest lamp from the J 39775 Jumper Harness connector cavity E to ground.

Does the test lamp illuminate?
--
Go to Step 6
Go to Step 5

5

Repair the open in the ignition feed circuit 439 to the TCC PWM Solenoid Valve. Refer to Electrical Diagnosis, Section 8.
Is the repair complete?
--
Go to Step 17
--

6

1. Install the test lamp from cavities E to U of the J 39775 Jumper Harness connector .
2. Using the scan tool, command the TCC PWM Solenoid Valve ON and OFF 3 times.

Does the test lamp illuminate when you command the TCC PWM Solenoid Valve ON, and turn OFF when you command the valve OFF?
--
Go to Step 8
Go to Step 7

7

1. Inspect circuit 418 for an open.
2. Inspect circuit 418 for a short to ground.
3. Repair the circuit if necessary.

Refer to Electrical Diagnosis, Section 8.
Did you find and correct a problem?
--
Go to Step 17
Go to Step 9

8

1. Install the J 39775 Jumper Harness on the Connector End View 20-way connector.
2. Using the J 39200 DVOM and the J 35616-A Connector Test Adapter Kit, measure the resistance between terminals E and U.

Is the resistance within the specified range?
10-15ohms
Go to Step 11
Go to Step 10

9

Inspect the PCM connector terminals for the following conditions:

1. Damaged connector pins
2. Backed out connector pins
3. Weak terminal tension
4. Repair the connectors if necessary.

Did you find and correct a problem?
--
Go to Step 17
Go to Step 16

10

1. Disconnect the Automatic Transmission Wiring Harness at the TCC PWM Solenoid Valve.
2. Measure the resistance of the TCC PWM Solenoid Valve.

Is the resistance within the specified range?
10-15ohms
Go to Step 12
Go to Step 15

11

Using the J 39200 DVOM and the J 35616-A Connector Test Adapter kit, measure the resistance between terminal E of the J 39775 Jumper Harness and the transmission case (ground). Measure the resistance between terminal U of the J 39775 Jumper Harness and the transmission case (ground).
Are both readings greater than the specified value?
250ohms
Go to Diagnostic Aids
Go to Step 13

12

1. Inspect the Automatic Transmission Wiring Harness for an open or short to ground.
2. Repair the harness if necessary.

Refer to Electrical Diagnosis, Section 8.
Did you find and repair a problem?
--
Go to Step 17
--

13

1. Disconnect the Automatic Transmission Wiring Harness at the TCC PWM Solenoid Valve.
2. Measure the resistance between each of the component terminals and the transmission case (ground).

Are both readings greater than the specified value?
250ohms
Go to Step 14
Go to Step 15

14

1. Inspect the Automatic Transmission Wiring Harness for a short to ground.
2. Repair the harness if necessary.

Refer to Electrical Diagnosis, Section 8.
Was a problem found and corrected?
--
Go to Step 17
--

15

Replace the TCC PWM Solenoid Valve.
Refer to Torque Converter Clutch Pulse Width Modulation Solenoid Valve Replacement, in On-Vehicle Service.
Is the replacement complete?
--
Go to Step 17
--

16

Replace the PCM.
Refer to Powertrain Control Module Replacement/Programming , Section 6.
Is the replacement complete?
--
Go to Step 17
--

17

1. After the repair is complete, select DTC.
2. Select Clear Info.
3. Ensure the following conditions:
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When you command the TCC PWM Solenoid Valve ON, the voltage drops to zero.



?€¢
When you command the TCC PWM Solenoid Valve OFF, the voltage increases to B+.



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All conditions met for 5 seconds.


4. Select Specific DTC and enter DTC P1860.

Has the test run and passed?
--
System OK
Begin diagnosis the again. Go to Step 1

P0740 Torque Converter Clutch Circuit Malfunction Driving the vehicle with this problem and not attending to it asap may cause further damage. When you feel a problem and or see the engine light on, use your head wisely and have a reputable transmission shop go through a complete diagnostic procedure, in most cases this is a fluid problem, but since you serviced the trans that can be ruled out, if you haven't changed the TCC solenoid yet do so, I was unclear about what you replaced, I assume the shift solenoid's, if you have replaced the TCC solenoid then the problem is either in the wiring to the trans or inside the trans in the torque converter clutch circuit or the torque converter itself, which is a all to common failure in these Vans, if the TCC is ok replace the torque converter, that of course requires removing the trans, this job will require a lift, it is just about impossible on the ground.

#1) Low or dirty transmission fluid #2) Wire/circuit issue shorted to power or ground #3) Failed torque converter clutch (TCC) solenoid #4) Failed TCC assembly in the torque converter.....

Since Transmission has been rebuilt I would strongly suspect the TCC solenoid and/or its wiring...When transmission was rebuilt did the TCC get replaced? If so, due to being intermittent, Check the TCC plug (both female and male) for bent or dirty contacts...also insure you have close to zero ohms of resistance from negative battery post to transmission case...A poor ground will cause a problem and be at times...saailer

I’m happy to help further over the phone at https://www.6ya.com/expert/david_6df67de3b14de867

The code probably says the solenoid is not working correctly or the signal from the solenoid is out of range.
The solenoid would need to be tested and maybe replaced.

The TCC solenoid is behind the side cover on the transmission and can be tough to replace as the side cover has to come off and out to gain access to the solenoid and wiring. Very little room to work with there. I believe it's about a 3 -1/2 hour job if you've done one before and I think the first one I did took about twice that long. Would be a good idea to change fluid and filter also.

Actually, the Torque Converter Clutch Solenoid is located within the transmission housing that is easily accessible through the transmission oil pan. The TCC solenoid may vary in location dependent upon manufacture but generally it is located as aforementioned. It can cause your vehicle to stall if stuck open or close because it controls loads to the engine via your torque converter which is located between the vehicle's engine and transmission. Also, make certain that you attempt to change the transmission fluid and filter before changing the TCC solenoid because that may be your underlying issue. If not, simply reuse your fresh oil and change the TCC soleniod.

P0740=Torque Converter Clutch Circuit/Open,
not a solenoid,or tps

DTC P1744 is "TCC - Excessive Slip Detected During Full TCC Engagement". Which means that the Torque Converter Clutch (TCC) is disengaged or the EPC pressure is at the minimum.

The most likely cause is a sticking or bad TCC solenoid inside the transmission. You can check the connector at the transmission to make sure it is clean and tight and that it is not damaged in any way.

If the TCC and wiring is okay, then pressure testing of the transmission will need to be done.

A new torque converter from Ford is about $265.00 and about 4 hours labor. Throw in a $40.00 TCC solenoid and I don't think it'll be more than $700.00 at worst.

If the pressure test is good then it's just going to be the $40.00 tcc solenoid and the cost of the transmission oil and filter changed which should be around $150.00

Good luck and hope it's just a loose wire harness to the solenoid which would cost $0.00 and just your time to locate the break in the wire. The other thing to, is to add a transmission fluid additive that would restore the clutch pack in the transmission and Torque Converter.

Several possibilities having to do with the torque converter clutch and TCC solenoid:

1. Replace transmission fluid, use a synthetic Dex VI, do a complete flush with pan removal and filter replacement

2. Check all grounds related to the transmission control solenoids, clean them and ensure good electrical contact.

3. Rebuild transmission, the TCC friction material is worn out.