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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
The cause could be a malfunction of the fan control module power supply or
ground circuit. The cause could also be a malfunction of the fan control module or the PCM.
TROUBLESHOOTING HINTS
Malfunction of fusible link Malfunction of fan control relay Malfunction of MFI relay Malfunction of fan control module Malfunction of PCM Damaged wiring harness or connector
DIAGNOSIS Required Special Tools:
MB991223: Harness Set MB991923: Power Plant ECU Check Harness
STEP 1. Check the circuit at fan control module connector A-23 (terminal
3).
1. Disconnect fan control module connector A-23, and measure at the
harness side connector.
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Fig. 9: Measuring Voltage Between Terminal 3 & Ground
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Q: Is there voltage battery positive voltage when the ignition switch is
turned to the "ON" position?
YES: Go to Step 8 .
NO: Go to Step 2.
STEP 2. 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 3.
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NO: Replace it, then go to Step 1 .
STEP 3. Check the MFI relay.
Refer to MULTIPORT FUEL INJECTION (MFI) RELAY AND
THROTTLE ACTUATOR CONTROL MOTOR RELAY CONTINUITY CHECK
.
Q: Is the MFI relay in good condition?
YES: Go to Step 4.
NO: Replace it, then go to Step 1 .
STEP 4. Check for harness dama
ge between fusible link number 2 and fan
control relay connector A-10X (terminal 4).
Fi
g. 10: Checkin
g Harness Dama
ge
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Q: Are the harness wires between fusible link number 2 and fan control
relay connector A-10X damaged?
YES: Repair or replace them, then go to Step 14 .
NO: Go to Step 5.
STEP 5. Check for harness damage between fan control relay connector
A-10X (terminal 2) and fan control module connector A-23 (terminal 3).
Fig. 11: Identifying Connector A
-10X
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Fig. 12: Identifying Connector A
-23
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Q: Are the harness wires between fan control relay connector A-10X
(terminal 2) and fan control module connector A-23 (terminal 3)
damaged?
YES: Repair or replace them, then go to Step 14 .
NO: Go to Step 6.
STEP 6. Check intermediate connector A-13 for loose, corroded or
damaged terminals, or terminals pushed back in the connector.
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Fig. 13: Identifying Connector A
-13
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Q: Are the connectors and terminals in good condition?
YES: Go to Step 7.
NO: Repair or replace the damaged components.
STEP 7. Check for harness damage between MFI relay connector B-16X
and fan control relay connector A-10X.
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Fig. 14: Identifying Connector A
-10X & B
-16X
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Q: Are the harness wires between MFI relay connector B-16X (terminal 4)
and fan control relay connector A-10X (terminal 1) damaged?
YES: Repair or replace them, then go to Step 14 .
NO: Go to Step 8.
STEP 8. Check for harness damage between fan control relay connector
A-10X (terminal 3) and ground.
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Fig. 15: Identifying Connector A
-10X
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Q: Are the harness wires between fan control relay connector A-10X
(terminal 3) and ground damaged?
YES: Repair or replace them, then go to Step 14 .
NO: Go to Step 9.
STEP 9. Check the circuit at fan control module connector A-23 (terminal
1).
1. Disconnect fan control module connector A-23, and measure at the
harness side connector.
2004 Mitsubishi Endeavor Limited 2004 ENGINE Engine Cooling - Endeavor
