Hummer H3. Manual — part 866

The torque converter clutch (TCC) solenoid valve is a normally-open exhaust valve that is used to
control torque converter clutch apply and release. When grounded, energized, by the powertrain
control module (PCM) or transmission control module (TCM), the TCC solenoid valve stops
converter signal oil from exhausting. This causes converter signal oil pressure to increase and
move the TCC solenoid valve into the apply position.

Torque Converter Clutch Pulse Width Modulation Solenoid Valve

Fig. 481: View Of Torque Converter Clutch Pulse Width Modulation Solenoid Valve
Courtesy of GENERAL MOTORS CORP.

The torque converter clutch pulse width modulation solenoid valve controls the fluid acting on
the converter clutch valve. The converter clutch valve controls the torque converter clutch (TCC)
apply and release. This solenoid is attached to the control valve body assembly within the
transmission. The TCC PWM solenoid valve provides a smooth engagement of the torque
converter clutch by operating during a duty cycle percent of ON time.

Transmission Fluid Pressure (TFP) Manual Valve Position Switch

2007 Hummer H3

2007 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - H3

Fig. 482: View Of Transmission Fluid Pressure (TFP) Manual Valve Position Switch
Courtesy of GENERAL MOTORS CORP.

The TFP manual valve position switch consists of 5 pressure switches (2 normally-closed and 3
normally-open) on the control valve body that sense whether fluid pressure is present in 5
different valve body passages. The combination of switches that are open and closed is used by
the powertrain control module (PCM) or transmission control module (TCM) in order to
determine the actual manual valve position. The TFP manual valve position switch, however,
cannot distinguish between PARK and NEUTRAL because the monitored valve body pressures
are identical in both cases.

The switches are wired to provide three signal lines that are monitored by the PCM/TCM. These
signals are used to help control line pressure, torque converter clutch apply and shift solenoid
valve operation. Voltage at each of the signal lines is either 0 or 12 volts.

In order to monitor the TFP manual valve position switch operation, the PCM/TCM compares
the actual voltage combination of the switches to a TFP combination table stored in its memory.

The TFP manual valve position switch signal voltage can be measured from each pin-to-ground

IMPORTANT: Seven valid combinations and 2 invalid combinations are

available from the transmission fluid pressure (TFP) manual
valve position switch. Refer to the Transmission Fluid Pressure
Manual Valve Position Switch Logic table for valid/invalid
combinations for range signal circuits A, B and C.

2007 Hummer H3

2007 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - H3

and compared to the combination table. On the automatic transmission (AT) wiring harness, pin
N is signal A, pin R is signal B and pin P is signal C. With the AT wiring harness assembly
connected and the engine running, a voltage measurement of these three lines will indicate a high
reading (near 12 volts) when a circuit is open and a low reading (0 volts) when the circuit is
switched to ground.

The transmission fluid temperature (TFT) sensor is part of the TFP manual valve position switch
assembly.

Vehicle Speed Sensor Assembly

2007 Hummer H3

2007 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - H3

Fig. 483: Vehicle Speed Sensor Assembly
Courtesy of GENERAL MOTORS CORP.

The vehicle speed sensor (VSS) provides vehicle speed information to the powertrain control
module (PCM) or transmission control module (TCM). The VSS is a permanent magnet (PM)
generator. The PM generator produces a pulsing AC voltage as rotor teeth on the transmission

2007 Hummer H3

2007 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - H3