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4LHD/4LHDX Application Manual
Powertrain Control Solutions
REV 1.1
Output Speed Sensor (VSS)
The Output Speed Sensor (also known as Vehicle Speed Sensor) is a variable reluctance magnetic pickup which receives
a sin wave from a speed gear on the output shaft and generates a square wave output. The sensor requires a two wire
connector from the Extension Housing to the TCM.
• The output speed sensor coil resistance is 1850-2250 ohms at 25.0 +/- 1.0°C.
• The maximum output speed sensor inductance is 2000 mH at 1000 Hz with 50 mA applied.
• The speed sensor will produce a minimum voltage (loaded) of 0.25 V peak positive and 0.25 negative at minimum
speed of 100 RPM.
• The speed sensor will produce a maximum voltage (loaded) of 100 V peak positive and 100 negative at a maximum
speed of 7200 RPM.
• All available GM and PCS extension housings use a symmetrical 40 tooth speed gear on the output shaft, resulting in
40 pulses per revolution to the TCM.
Pass-Thru Connector
The transmission to vehicle electrical interface is a 20 pin connector used to mate the internal and external harnesses of
the transmission. Use the alignment key to ensure proper installation. Reference Figure 1.5.2-1.
• The pass-thru connector envinromental temperature shall not exceed -40 to 135°C at any time. Proper shielding is
required. Reference Section 1.3.4 for temperature details.
NEGATIVE TERMINAL
➤
POSITIVE TERMINAL
➤
SPEED SENSOR CONNECTORS
FIGURE 2.6.8.1-3 Speed Sensor Connector
2.6.8.2. Shift Solenoids
The shift solenoids are two-port on/off devices that are used to control the shift
change event.
- Shift solenoid coil resistance is 20.0-25.0 ohms at 20.0 +/- 5.0°C.
- The maximum shift solenoid inductance is 60.0 mH at 1000 Hz.
- The maximum shift solenoid pull-in current is 307.0 mA.
- The minimum shift solenoid drop-out current is 5.0 mA.
2.6.8.3. TCC Control Solenoid
The TCC Control solenoid is a three-port, normally closed device used to control the
apply and release pressure to the Torque Converter Clutch.
- The suggested TCC control solenoid operating frequency is 32 Hz-42 Hz.
- The TCC control solenoid coil resistance is 10.0-12.0 ohms at 20 +/- 5°C.
- The maximum TCC control solenoid inductance is 35.0 mH at 120 Hz.
- The maximum TCC control solenoid pull-in current is 580.0 mA.
- The minimum TCC control solenoid drop-out current is 5.0 mA.
- The TCC control solenoid duty cycle shall not exceed 95% under any operating
conditions.
Figure 1.5.1-4: Speed Sensor Connector
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