Mitsubishi MOTORS Lancer 2004, Руководство по ремонту

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TROUBLESHOOTING
ENGINE COOLING 14-16
INSPECTION PROCEDURE 2: Cooling Fan (L.H.) and Cooling Fan (R.H.) <4G1 (Vehicles with A/C)> or
A/C Condenser Fan <4G6> do not Change Speed or Stop
COOLING FAN (L.H.) AND COOLING FAN
(R.H.) OR A/C CONDENSER FAN DRIVE
CIRCUIT
Refer to P.14-6 .
CIRCUIT OPERATION
Refer to P.14-6 .
TECHNICAL DESCRIPTION
•
If the communication line wiring harness between
the cooling fan motor drive control unit and the
engine-ECU <M/T> or the engine-A/T-ECU
<A/T> is open, the cooling fan motor (L.H.) and
the cooling fan motor (R.H.) <4G1 (Vehicles with
A/C)>, or the A/C condenser fan motor <4G6>
rotate to prevent the engine from overheating.
•
If the system voltage is continuously supplied to
the cooling fan motor drive control unit by a fan
motor relay malfunction and a short circuit on the
cooling fan motor drive control unit power supply
wiring harness, the cooling fan motor (L.H.) and
the cooling fan motor (R.H.) <4G1 (Vehicles with
A/C)>, or the A/C condenser fan motor <4G6>
rotate.
•
The cause could also be a malfunction of the
cooling fan motor (L.H.). <Vehicles without A/C>
•
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
cooling fan motor drive control unit or the
engine-ECU <M/T> or engine-A/T-ECU <A/T>.
TROUBLESHOOTING HINTS
•
Malfunction of fan control relay
•
Malfunction of cooling fan motor (L.H.) <Vehicles
without A/C>
•
Malfunction of cooling fan motor drive control unit
•
Malfunction of engine-ECU <M/T> or
engine-A/T-ECU <A/T>
•
Damaged wiring harness or connector
DIAGNOSIS
STEP 1. Check the fan control relay.
Refer to P.14-24 .
Q: Is the fan control relay in good condition?
YES :
Go to Step 2 .
NO :
Replace the fan control relay. Then go to
Step 8 .
STEP 2. Check the fan control relay connector
A-09X.
Q: Is the connector in good condition?
YES :
Go to Step 3 .
NO :
Repair the connector or replace the relay
box. Then go to Step 8 .
AC303510 AB
Fan control relay
Relay box Connector: A-09X
A-09X