Mitsubishi Galant. Manual - part 332
ENGINE COOLING DIAGNOSIS
TSB Revision
ENGINE COOLING
14-6
CIRCUIT OPERATION
•
The fan controller is powered from fusible link
number 5.
•
The PCM judges the required revolution speed of
radiator fan motor and condenser fan motor using
the input signals transmitted from A/C switch,
automatic compressor controller, vehicle speed
sensor and engine coolant temperature sensor.
The PCM activates the fan controller to drive the
radiator fan motor and condenser fan motor.
TECHNICAL DESCRIPTION
•
The cause could be a malfunction of the fan
controller power supply or ground circuit.
•
The cause could also be a malfunction of the fan
controller or the PCM.
TROUBLESHOOTING HINTS
•
Malfunction of fusible link
•
Malfunction of fan control relay
•
Malfunction of fan controller
•
Malfunction of PCM
•
Damaged wiring harness or connector
DIAGNOSIS
Required Special Tool:
•
MB991223: Harness Set
STEP 1. Check the circuit at fan controller connector A-30.
(1) Disconnect fan controller connector A-30, and measure at
the harness side connector.
(2) Measure the voltage between terminal number 3 and
ground.
•
When the ignition switch is turned to "ON" position,
voltage should be battery positive voltage.
Q: Is the voltage battery positive voltage when the ignition
switch is turned to "ON" position?
YES : Go to Step 7.
NO : Go to Step 2.
STEP 2. Check the fan control relay.
Refer to
.
Q: Is the fan control relay in good condition?
YES : Go to Step 3.
NO : Replace it, then go to Step 10.
AC004036AB
CONNECTOR: C-04
AC004037AB
CONNECTOR: C-39
PCM
AC000246
CONNECTOR A-30
AB