module MITSUBISHI ENDEAVOR 2004 Service Repair Manual

Malfunction of fan control relay Malfunction of fan control module Malfunction of PCM
DIAGNOSIS Required Special Tools:
MB991223: Harness Set MB991923: Power Plant ECU Check Harness
STEP 1. Check the fan control relay.
Refer to FAN CONTROL RELAY CONTINUITY CHECK
.
Q: Is the fan control relay in good condition?
YES: Go to Step 2.
NO: Replace the part, then go to Step 7 .
STEP 2. Check the harness wire between fan control relay connector A-
10X (terminal 2) and fan control module connector A-23 (terminal 3).

2004 Mitsubishi Endeavor Limited 2004 ENGINE Engine Cooling - Endeavor

Fig. 26: Identifying Connector A
-23
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
Q: Are the harness wires between fan control relay connector A-10X and
fan control module connector A-23 damaged?
YES: Repair or replace the part, then go to Step 7 .
NO: Go to Step 3.
STEP 3. Measure the output circuit voltage at PCM connector B-18
(terminal 10) by using check harness special tool MB991923.
1. Disconnect all the connectors from the PCM.

2004 Mitsubishi Endeavor Limited 2004 ENGINE Engine Cooling - Endeavor

NO: Go to Step 4.
STEP 4. Check fan control module connector A23 and PCM connector B-
18 for loose, corroded or damaged terminals, or terminals pushed back in
the connector.
Fig. 30: Locating Connector A
-23
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

2004 Mitsubishi Endeavor Limited 2004 ENGINE Engine Cooling - Endeavor

Q: Are the connectors in good condition?
YES: Go to Step 5.
NO: Repair or replace the damaged components.
STEP 5. Check the harness wire between PCM connector B-18 (terminal
10) and fan control module connector A-23 (terminal 2)
.

2004 Mitsubishi Endeavor Limited 2004 ENGINE Engine Cooling - Endeavor

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.
Fig. 33: Identifying Connector A
-23
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
Q: Are the harness wires between PCM connector B-18 and fan control
module connector A-23 damaged?
YES: Repair or replace them, then go to Step 7 .
NO: Go to Step 6.
STEP 6. Check the fan control module at PCM connector B-18.
1. Disconnect PCM connector
B-18.

2004 Mitsubishi Endeavor Limited 2004 ENGINE Engine Cooling - Endeavor

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.
2. Pull out the pin 10 and connect it to the body ground.
Fig. 35: Checking Fan Control Module

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3. Reconnect PCM connector B-18 with pin 10 still removed.
4. Turn the ignition switch to the "ON" position.
Q: Do the radiator fan motor and condenser fan motor stop?
YES: Re
place the PCM. Then
go to Ste
p 7.

2004 Mitsubishi Endeavor Limited 2004 ENGINE Engine Cooling - Endeavor

NO: Replace the radiator fan motor. Then go to Step 7.
STEP 7. Check the symptoms.
Q: Do the radiator fan and condenser fan operate correctly?
YES: The procedure is complete.
NO: Return to Step 1 .
INSPECTION PROCEDURE 5: Radiator Fan does not Operate TECHNICAL DESCRIPTION The cause could be a malfunction of the radiator fan motor or an open circuit
between the fan control module and the radiator fan motor. TROUBLESHOOTING HINTS Malfunction of radiator fan motor DIAGNOSIS Replace the radiator fan motor. INSPECTION PROCEDURE 6: Condenser Fan does not Operate Radiator Fan and Condenser Fan Drive Circuit Refer to INSPECTION PROCEDURE 3: RADIATOR FAN AND CONDENSER FAN DO NOT OPERATE
.
CIRCUIT OPERATION
The fan control module is powered from fusible link number 2. 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 control module to drive the
radiator fan motor and condenser fan motor.
TECHNICAL DESCRIPTION
2004 Mitsubishi Endeavor Limited 2004 ENGINE Engine Cooling - Endeavor

The cause could be a malfunction of the condenser fan motor or fan control module.TROUBLESHOOTING HINTS
Malfunction of condenser fan motor Malfunction of fan control module
DIAGNOSIS
STEP 1. Check the condenser fan motor.
Refer to CONDENSER AND CONDENSER FAN MOTOR
.
Q: Is the condenser fan motor in good condition?
YES: Go to Step 2.
NO: Replace the condenser fan motor, then go to Step 3 .
STEP 2. Check the fan control module.
Refer to FAN CONTROL MODULE CHECK
.
Q: Is the fan control module in good condition?
YES: Go to Step 3.
NO: Replace the radiator fan motor, then go to Step 3.
STEP 3. Check the symptoms.
Q: Does the condenser fan operate correctly?
YES: The procedure is complete.
NO: Return to Step 1 .
ON-VEHICLE SERVICE ENGINE COOLANT LEAK CHECK
WARNING:When pressure testing the cooling system, slowly
release cooling system pressure to avoid getting

2004 Mitsubishi Endeavor Limited 2004 ENGINE Engine Cooling - Endeavor

11. After repeatedly revving the engine up to 3,000 r/min several times, stop the
engine.
12. Remove the radiator cap after the engine has cooled, and pour in coolant up to
the brim. Reinstall the cap.
13. Add coolant to the radiator condenser tank assembly between the "FULL" and
"LOW" mark if necessary. ENGINE COOLANT CONCENTRATION TEST Refer to RECOMMENDED LUBRICANTS AND LUBRICANT CAPACITIES
.
FAN CONTROL MODULE CHECK 1. Remove the fan control module connector.
2. Turn the ignition switch to the "ON" position, and measure the voltage
between the harness-side connector terminals.
Standard value: Battery positive voltage
CAUTION: Do not overfill the radiator condenser tank
assembly.

2004 Mitsubishi Endeavor Limited 2004 ENGINE Engine Cooling - Endeavor

Fig. 43: Measuring Voltage Between Harness
-Side Connector
Terminals

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3. Connect the fan control module connector, and disconnect the condenser fan
motor connector.
4. Ensure that the A/C switch is off, and start the engine and run it at idle.
5. Measure the voltage between the fan control module-side connector terminals.
Standard value: 1V or less
WARNING:Stay clear of the fan when the fan starts running.

2004 Mitsubishi Endeavor Limited 2004 ENGINE Engine Cooling - Endeavor