Hummer H1 Service Manual page 296

____________________________________________
®
DTC P0756 2-3 Shift Solenoid Valve Performance
Circuit Description
The 2-3 shift solenoid controls fluid acting on the 2-3 shift
valves. The solenoid is normally open and is used with the 1-2
shift solenoid to provide four different shift combinations.
This DTC detects a non 1st gear when 1st gear is commanded,
or 1st gear when 4th gear is commanded.
05745159
TORQUE
CONVERTER
PRESSURE
CLUTCH
CONTROL
SOLENOID
SOLENOID
(TCC)
(PCS)
D C
C34
C32-F C32-E
C32-G
C27-C15 C27-C7 C28-C5
PCS PCS TCC PWM
LOW HIGH SOLENOID
CONTROL
Transmission/Transfer Case
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-D C32-C
C28-C6 C28-C4
2-3 SS 1-2 SS
CONTROL CONTROL
POWERTRAIN
CONTROL
MODULE
(PCM)
Conditions For Setting DTC
• No DTCs P0121, P0122, P0123, P0220, P0221, P0222,
P0223, P0225, P0226, P0227, P0228.
• No DTC P0722 or P0723.
• No sensor DTCs P0712 or P0713.
• No 4WD Lo DTC P1875.
• No DTC P1810.
• No shift solenoid electrical DTCs P0753 or P0758.
• No engine speed DTCs P0219.
• No DTCs P0716 or P0717.
• Engine running.
• Not in 4WD Low.
• Vehicle speed is greater than 6 km/h (4 mph).
• Throttle position is greater than 12%.
• Transmission fluid temperature is between 20° and
130°C (68° and 266° F).
• Engine torque is between 80 and 450 ft/lbs.
• Engine speed is less than 3750 rpm.
TRANSMISSION
FLUID
TEMPERATURE
SENSOR
(TFT)
M L
C32-J C32-H
C29-B12 C27-C9
SENSOR TFT
GROUND SENSOR
SIGNAL
9 - S 1 2 - 0 6 7
5-97