Mitsubishi Grandis. Manual - part 808
TROUBLESHOOTING
ENGINE COOLING
14-5
TECHNICAL DESCRIPTION
• The cause could be a malfunction of the fan
controller power supply or earth circuit.
• If the communication line wiring harness between
the fan controller and the engine-ECU <M/T> or
engine-A/T-ECU <A/T> is short-circuited to earth,
the radiator fan motor and the condenser fan
motor will not rotate.
• The cause could also be a malfunction of input
signal from the A/C switch, the water temperature
sensor unit and the vehicle speed sensor <M/T>
or the output shaft speed sensor <A/T> to the
engine-ECU <M/T> or engine-A/T-ECU <A/T>.
• The cause could also be a malfunction of the fan
controller or the engine-ECU <M/T> or
engine-A/T-ECU <A/T>.
TROUBLESHOOTING HINTS
• Malfunction of fusible link No.2
• Malfunction of fan control relay
• Malfunction of cooling fan motor and fan
controller
• Malfunction of engine-ECU <M/T> or
engine-A/T-ECU <A/T>
• Damaged wiring harness or connector
DIAGNOSIS
STEP 1. Measure the power supply voltage at fan
controller connector A-26.
(1) Disconnect fan controller connector A-26 and
measure wiring harness side connector.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between fan controller
connector A-26 terminal 3 and body earth.
• The voltage should measure system voltage.
(4) Turn the ignition switch to the "LOCK" (OFF)
position.
(5) Connect fan controller connector A-26.
Q: Is the measured voltage system voltage?
YES :
Go to Step 17.
NO :
Go to Step 2.
STEP 2. Check the fan controller connector A-26.
Q: Is the connector in good condition?
YES :
Go to Step 3.
NO :
Repair or replace the connector. Then go to
Step 24.
STEP 3. Check the fusible link No.2.
Q: Is the fusible link No.2 in good condition?
AC302093
1
2
3
AG
A-26
Connector: A-26
3
2
1
AC201418
Connector A-26
(Component side)
AH
AC302093
1
2
3
AG
A-26
Connector: A-26
AC311245AB
Fusible link
No.2
Relay box