P0740 code tcc solenoid
03-02-2014, 08:46 PM
#1
P0740 code tcc solenoid Ok got the car started, idled for 30 seconds and I get the p0740 code (tcc enable solenoid circuit electrical)
So cut the car off and unhooked trans connector from tranny... Tested e pin for power and with key on engine off I get 10.5 volts which I'm sure would be 12v once the car goes on..
Dropped the pan and removed the tcc solenoid, ohmed it out to 10.7
I also connected the solenoid direct to my new battery and it clicks, a very light click but it clicks!
Also hooked the internal harness back to the trans connector and with key on I get 10.5 volts when I check the pigtail that plugs into the tcc solenoid
So the solenoid works and is getting power once the key is on..
Am I missing something?
So cut the car off and unhooked trans connector from tranny... Tested e pin for power and with key on engine off I get 10.5 volts which I'm sure would be 12v once the car goes on..
Dropped the pan and removed the tcc solenoid, ohmed it out to 10.7
I also connected the solenoid direct to my new battery and it clicks, a very light click but it clicks!
Also hooked the internal harness back to the trans connector and with key on I get 10.5 volts when I check the pigtail that plugs into the tcc solenoid
So the solenoid works and is getting power once the key is on..
Am I missing something?
03-04-2014, 12:04 AM
#4
Bump for more info..
Purchased a new tcc solenoid thinking my old one went bad, still won't engage when commanded to using VCM controls..
Car is off with key on, I used a multimeter on the pigtail going to tcc solenoid and once commanded it still shows 12v vs ground like its supposed to?
Wiring is correct, 12v to positive of solenoid, and negative side goes to pin s and that goes to red 42 which is tcc enable control!
Using 4l60 tune
Purchased a new tcc solenoid thinking my old one went bad, still won't engage when commanded to using VCM controls..
Car is off with key on, I used a multimeter on the pigtail going to tcc solenoid and once commanded it still shows 12v vs ground like its supposed to?
Wiring is correct, 12v to positive of solenoid, and negative side goes to pin s and that goes to red 42 which is tcc enable control!
Using 4l60 tune
03-04-2014, 01:26 AM
#5
TCC Enable solenoid is the "on/off" solenoid in the 4L60E. The 4L80E doesn't use this solenoid.
TCC PWM solenoid is used in both units.(excluding 93-94 4L60E's that didn't have PWM control).
When doing the relay mod, the enable circuit can be used to on/off the PWM solenoid in the 4L80E.
OR the PWM circuit can be used to PWM the solenoid in the 4L80E.
If you PWM it, it requires two relays.
Your harness may be built with one or two relays. You will have to determine this.
When checking a circuit for power, even though you ground the circuit, it will still show voltage on the circuit.
i.e. You have power going into a trans solenoid (or an engine fuel injector) you will still have power going out the opposite side. (it's just a winding, essentially a long spool of continuous wire).
The multimeter reads the power in the circuit to whatever you ground it's common lead to but doesn't create enough ground to activate the device. If you ground the solenoid by the PCM control, there is still power in the circuit, the only difference is the solenoid has enough ground to pull in.
If you want to test the PCM control, you need to disconnect the connector at the solenoid to eliminate power, and test the control side (PCM) for continuity to ground (good chassis ground) while activating the PCM control in the scanner.
TCC PWM solenoid is used in both units.(excluding 93-94 4L60E's that didn't have PWM control).
When doing the relay mod, the enable circuit can be used to on/off the PWM solenoid in the 4L80E.
OR the PWM circuit can be used to PWM the solenoid in the 4L80E.
If you PWM it, it requires two relays.
Your harness may be built with one or two relays. You will have to determine this.
When checking a circuit for power, even though you ground the circuit, it will still show voltage on the circuit.
i.e. You have power going into a trans solenoid (or an engine fuel injector) you will still have power going out the opposite side. (it's just a winding, essentially a long spool of continuous wire).
The multimeter reads the power in the circuit to whatever you ground it's common lead to but doesn't create enough ground to activate the device. If you ground the solenoid by the PCM control, there is still power in the circuit, the only difference is the solenoid has enough ground to pull in.
If you want to test the PCM control, you need to disconnect the connector at the solenoid to eliminate power, and test the control side (PCM) for continuity to ground (good chassis ground) while activating the PCM control in the scanner.
03-04-2014, 01:47 AM
#6
yes Im using the 4l60 on/off signal to trigger the 4l80 pwm solenoid.
I'll do some more poking around on the solenoid pigtail, just bought the multimeter so Im still learning..
You mentioned check my harness? that threw me off a bit
I'm just using one relay to reverse shift solenoid B
I'll do some more poking around on the solenoid pigtail, just bought the multimeter so Im still learning..
You mentioned check my harness? that threw me off a bit
I'm just using one relay to reverse shift solenoid B
Trending Topics
03-06-2014, 08:42 PM
#8
TCC Enable solenoid is the "on/off" solenoid in the 4L60E. The 4L80E doesn't use this solenoid.
TCC PWM solenoid is used in both units.(excluding 93-94 4L60E's that didn't have PWM control).
When doing the relay mod, the enable circuit can be used to on/off the PWM solenoid in the 4L80E.
OR the PWM circuit can be used to PWM the solenoid in the 4L80E.
If you PWM it, it requires two relays.
Your harness may be built with one or two relays. You will have to determine this.
When checking a circuit for power, even though you ground the circuit, it will still show voltage on the circuit.
i.e. You have power going into a trans solenoid (or an engine fuel injector) you will still have power going out the opposite side. (it's just a winding, essentially a long spool of continuous wire).
The multimeter reads the power in the circuit to whatever you ground it's common lead to but doesn't create enough ground to activate the device. If you ground the solenoid by the PCM control, there is still power in the circuit, the only difference is the solenoid has enough ground to pull in.
If you want to test the PCM control, you need to disconnect the connector at the solenoid to eliminate power, and test the control side (PCM) for continuity to ground (good chassis ground) while activating the PCM control in the scanner.
TCC PWM solenoid is used in both units.(excluding 93-94 4L60E's that didn't have PWM control).
When doing the relay mod, the enable circuit can be used to on/off the PWM solenoid in the 4L80E.
OR the PWM circuit can be used to PWM the solenoid in the 4L80E.
If you PWM it, it requires two relays.
Your harness may be built with one or two relays. You will have to determine this.
When checking a circuit for power, even though you ground the circuit, it will still show voltage on the circuit.
i.e. You have power going into a trans solenoid (or an engine fuel injector) you will still have power going out the opposite side. (it's just a winding, essentially a long spool of continuous wire).
The multimeter reads the power in the circuit to whatever you ground it's common lead to but doesn't create enough ground to activate the device. If you ground the solenoid by the PCM control, there is still power in the circuit, the only difference is the solenoid has enough ground to pull in.
If you want to test the PCM control, you need to disconnect the connector at the solenoid to eliminate power, and test the control side (PCM) for continuity to ground (good chassis ground) while activating the PCM control in the scanner.
