Mitsubishi 3000GT Service Manual page 1288

55-68
FULL AUTO AIR CONDITIONING - Troubleshooting
7. Inspection of air conditioning power transistor and blower motor relay circuits
Ignition
switch IG;!
I motor UY
Blower motor
HI relay
cup to 1995
models>
Troubleshooting Hints
l Air conditioning control unit terminal voltages
Signal name
Terminal No.
51 Air conditioning power transistor
collector
52
Air conditioning power transistor
base
101 Blower motor HI relay
Blower motor
relay
. .
Switch is turned OFF.
Switch is placed in LO.
Switch is placed in HI.
Blower switch is turned OFF.
Blower switch is placed in LO.
Blower switch is placed in HI.
Fan switch HI is ON.
Fan switch in ME, LO, or OFF.
TSB Revision
Air conditioning control unit
Power
transis-
tor drive
circuit
Condition
Solar
sensor
Terminal voltage
Battery positive
voltage
Approx. 7 V
OV
o v
Approx. 1.3 V
Approx. 1.2 V
1.5 V or less
Battery positive
voltage