Hummer H1 Service Manual page 259

5-60 Transmission/Transfer Case
DTC P0713 Transmission Fluid Temperature
(TFT) Sensor Circuit - High Input (Low Tem-
perature Indicated)
Circuit Description
The transmission fluid temperature (TFT) sensor is a ther-
mister that controls signal voltage to the PCM which supplies a
5-volt reference signal to the sensor on circuit 359. When the
transmission fluid is cold sensor resistance is high and the
TCM/PCM will sense high signal voltage. As fluid tempera-
ture warms to normal operating temperature of 100° C (212°
F), sensor resistance increases and the voltage drops to about
1.5 to 2 volts.
This DTC detects a continuous open or short to power in the
signal circuit or the sensor.
Conditions For Setting DTC
• TFT sensor indicating a voltage greater than 4.92 volts.
• Ignition is "on."
• All conditions met for 50.5 seconds.
Action Taken When DTC Sets
• Transmission default temperature will be 140° C (275° F).
TORQUE
CONVERTER
PRESSURE
CLUTCH
CONTROL
SOLENOID
SOLENOID
(TCC)
(PCS)
D C
C34
C32-F
C32-G
C27-C15 C27-C7
PCS PCS TCC PWM
LOW HIGH SOLENOID
CONTROL
_____________________________________________
HOT IN RUN
AND START
FUSE 2A
10A
EXTERIOR
C33-F
C34-E
1-2 SHIFT
SOLENOID
(1-2)
2-3 SHIFT
SOLENOID
(2-3)
S B A
C32-E C32-D C32-C
C28-C5 C28-C6 C28-C4
2-3 SS 1-2 SS
CONTROL CONTROL
POWERTRAIN
CONTROL
MODULE
(PCM)
NOTE: Scan tool will not display default temperature
• Freeze 1-2 shift adapts from being updated.
• The PCM will illuminate the warning light.
Conditions For Clearing DTC
• The PCM will turn off the warning light after three con-
secutive ignition cycles without a failure reported.
• The DTC can be cleared from the PCM with the scan
tool. The DTC will be cleared when the vehicle has
achieved 40 warm-up cycles without a failure reported.
• The PCM will cancel DTC default actions when the
fault no longer exists and the ignition is cycled "off"
lone enough to power down the PCM.
TRANSMISSION
FLUID
TEMPERATURE
SENSOR
(TFT)
M L
C32-J C32-H
C29-B12 C27-C9
SENSOR TFT
GROUND SENSOR
SIGNAL
®