Need more tranny HELP!!!!
Thread Starter
Intermediate
Joined: Dec 2002
Posts: 25
Likes: 0
From: Akron Oh
Need more tranny HELP!!!!
1st question which transmission line is the return line on a 2000 C5, the upper or lower line coming off the radiator? Second has anyone ever had any experience in changing the temprature sending unit in the tranny? On dealer told me that I just had to drop the tranny pan and it was right there. Another one said that the whole tranny had to be dropped to replace it. Any help would be greatly appreciated.
Drifting
Joined: Jun 2004
Posts: 1,483
Likes: 0
From: St. louis, Missouri
Originally Posted by YellowLsWon
1st question which transmission line is the return line on a 2000 C5, the upper or lower line coming off the radiator? Second has anyone ever had any experience in changing the temprature sending unit in the tranny? On dealer told me that I just had to drop the tranny pan and it was right there. Another one said that the whole tranny had to be dropped to replace it. Any help would be greatly appreciated.
The automatic transmission fluid temperature (TFT) sensor is part of the automatic transmission fluid pressure (TFP) manual valve position switch. The TFT sensor is a resistor, or thermistor, which changes value based on temperature. The sensor has a negative-temperature coefficient. This means that as the temperature increases, the resistance decreases, and as the temperature decreases, the resistance increases. The powertrain control module (PCM) supplies a 5-volt reference signal to the sensor on circuit 1227 and measures the voltage drop in the circuit. When the transmission fluid is cold, the sensor resistance is high and the PCM detects high signal voltage. As the fluid temperature warms to a normal operating temperature, the resistance becomes less and the signal voltage decreases. The PCM uses this information to control shift quality and torque converter clutch apply.
From the looks of it, just the pan has to be dropped.
Valve Body and Pressure Switch Replacement
Removal Procedure
Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
Remove the transmission oil pan and filter. Refer to Automatic Transmission Fluid/Filter Replacement .
Disconnect the internal wiring harness electrical connectors from the following components:
- Transmission pressure switch (1)
- 1-2 shift control solenoid (2)
- 2-3 shift control solenoid (3)
- Pressure control solenoid (4)
- TCC PWM solenoid (5)
- 3-2 control solenoid (6)
Remove the TCC PWM solenoid retainer.
Remove the TCC PWM solenoid in order to access one of the TCC solenoid retaining bolts.
Remove the TCC solenoid retaining bolts and the valve body bolts which retain the internal wiring harness.
Remove the TCC solenoid (with O-ring seal) and wiring harness assembly from the control valve body, then reposition the assembly to the side of the transmission case.
Remove the control valve body bolts which retain the transmission fluid pressure switch assembly to the control valve body.
Remove the transmission fluid pressure switch assembly.
Inspect the transmission fluid pressure switch assembly for damage or debris.
Last edited by Anthony01; Apr 20, 2005 at 10:06 PM.
Drifting
Joined: Jun 2004
Posts: 1,483
Likes: 0
From: St. louis, Missouri
Originally Posted by YellowLsWon
1st question which transmission line is the return line on a 2000 C5, the upper or lower line coming off the radiator? Second has anyone ever had any experience in changing the temprature sending unit in the tranny? On dealer told me that I just had to drop the tranny pan and it was right there. Another one said that the whole tranny had to be dropped to replace it. Any help would be greatly appreciated.
The automatic transmission fluid temperature (TFT) sensor is part of the automatic transmission fluid pressure (TFP) manual valve position switch. The TFT sensor is a resistor, or thermistor, which changes value based on temperature. The sensor has a negative-temperature coefficient. This means that as the temperature increases, the resistance decreases, and as the temperature decreases, the resistance increases. The powertrain control module (PCM) supplies a 5-volt reference signal to the sensor on circuit 1227 and measures the voltage drop in the circuit. When the transmission fluid is cold, the sensor resistance is high and the PCM detects high signal voltage. As the fluid temperature warms to a normal operating temperature, the resistance becomes less and the signal voltage decreases. The PCM uses this information to control shift quality and torque converter clutch apply.
From the looks of it, just the pan has to be dropped. And I think the bottom line is return
Valve Body and Pressure Switch Replacement
Removal Procedure
Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
Remove the transmission oil pan and filter. Refer to Automatic Transmission Fluid/Filter Replacement .
Disconnect the internal wiring harness electrical connectors from the following components:
- Transmission pressure switch (1)
- 1-2 shift control solenoid (2)
- 2-3 shift control solenoid (3)
- Pressure control solenoid (4)
- TCC PWM solenoid (5)
- 3-2 control solenoid (6)
Remove the TCC PWM solenoid retainer.
Remove the TCC PWM solenoid in order to access one of the TCC solenoid retaining bolts.
Remove the TCC solenoid retaining bolts and the valve body bolts which retain the internal wiring harness.
Remove the TCC solenoid (with O-ring seal) and wiring harness assembly from the control valve body, then reposition the assembly to the side of the transmission case.
Remove the control valve body bolts which retain the transmission fluid pressure switch assembly to the control valve body.
Remove the transmission fluid pressure switch assembly.
Inspect the transmission fluid pressure switch assembly for damage or debris.
Team Owner
Joined: Aug 2003
Posts: 38,314
Likes: 35
Originally Posted by Anthony01
The automatic transmission fluid temperature (TFT) sensor is part of the automatic transmission fluid pressure (TFP) manual valve position switch. The TFT sensor is a resistor, or thermistor, which changes value based on temperature. The sensor has a negative-temperature coefficient. This means that as the temperature increases, the resistance decreases, and as the temperature decreases, the resistance increases. The powertrain control module (PCM) supplies a 5-volt reference signal to the sensor on circuit 1227 and measures the voltage drop in the circuit. When the transmission fluid is cold, the sensor resistance is high and the PCM detects high signal voltage. As the fluid temperature warms to a normal operating temperature, the resistance becomes less and the signal voltage decreases. The PCM uses this information to control shift quality and torque converter clutch apply.
From the looks of it, just the pan has to be dropped.
Valve Body and Pressure Switch Replacement
Removal Procedure
Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
Remove the transmission oil pan and filter. Refer to Automatic Transmission Fluid/Filter Replacement .
Disconnect the internal wiring harness electrical connectors from the following components:
- Transmission pressure switch (1)
- 1-2 shift control solenoid (2)
- 2-3 shift control solenoid (3)
- Pressure control solenoid (4)
- TCC PWM solenoid (5)
- 3-2 control solenoid (6)
Remove the TCC PWM solenoid retainer.
Remove the TCC PWM solenoid in order to access one of the TCC solenoid retaining bolts.
Remove the TCC solenoid retaining bolts and the valve body bolts which retain the internal wiring harness.
Remove the TCC solenoid (with O-ring seal) and wiring harness assembly from the control valve body, then reposition the assembly to the side of the transmission case.
Remove the control valve body bolts which retain the transmission fluid pressure switch assembly to the control valve body.
Remove the transmission fluid pressure switch assembly.
Inspect the transmission fluid pressure switch assembly for damage or debris.
From the looks of it, just the pan has to be dropped.
Valve Body and Pressure Switch Replacement
Removal Procedure
Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
Remove the transmission oil pan and filter. Refer to Automatic Transmission Fluid/Filter Replacement .
Disconnect the internal wiring harness electrical connectors from the following components:
- Transmission pressure switch (1)
- 1-2 shift control solenoid (2)
- 2-3 shift control solenoid (3)
- Pressure control solenoid (4)
- TCC PWM solenoid (5)
- 3-2 control solenoid (6)
Remove the TCC PWM solenoid retainer.
Remove the TCC PWM solenoid in order to access one of the TCC solenoid retaining bolts.
Remove the TCC solenoid retaining bolts and the valve body bolts which retain the internal wiring harness.
Remove the TCC solenoid (with O-ring seal) and wiring harness assembly from the control valve body, then reposition the assembly to the side of the transmission case.
Remove the control valve body bolts which retain the transmission fluid pressure switch assembly to the control valve body.
Remove the transmission fluid pressure switch assembly.
Inspect the transmission fluid pressure switch assembly for damage or debris.
Just the pan has to be dropped. I had to have this done on my car shortly after I got it.
Melting Slicks
Joined: Sep 2004
Posts: 3,178
Likes: 13
From: N. County/San Diego
Originally Posted by YellowLsWon
1st question which transmission line is the return line on a 2000 C5, the upper or lower line coming off the radiator? Second has anyone ever had any experience in changing the temprature sending unit in the tranny? On dealer told me that I just had to drop the tranny pan and it was right there. Another one said that the whole tranny had to be dropped to replace it. Any help would be greatly appreciated.
*The top line (comming off the rad) "is" the return line!
I installed: B&M model #70264 (24,000 GVW) came with all the hoses, clamps, etc. www.bmracing.com
*You may want to buy some add hi-pressure hose (ie:extra length) and route them down the front of the rad and back up behind the rad for a cleaner install... or..... you can run the cooler from the "in" line (bottom of rad) which isn`t the recomended way, per B&M, but will also work without any issues.
Cheers, Rick
