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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
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Fig. 25: Identifying Connector A
-10X
Courtes
y of MITSUBISHI MOTOR SALES OF AMERICA
.
2004 Mitsubishi Endeavor Limited 2004 ENGINE Engine Cooling - Endeavor
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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
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Fig. 27: Disconnecting Connector B
-18 From PCM
2004 Mitsubishi Endeavor Limited 2004 ENGINE Engine Cooling - Endeavor
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Courtesy of MITSUBISHI MOTOR SALES OF AMERICA
.
2. Connect special tool MB991923 (check harness) between the PCM and
the bod
y-side harness connector.
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Fig. 28: Connecting Special Tool MB991923
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
3. Start the engine and run it at idle. [Engine coolant temperature: 80°C
(176°F) or less]
4. Measure the voltage between terminal number 10 and ground.
Fig. 29: Measuring Voltage Between Terminal No. 10 & Ground
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
Q: Is the voltage 0 to 0.3 volt when the radiator fan is not operating?
YES: Go to Ste
p 7 .
2004 Mitsubishi Endeavor Limited 2004 ENGINE Engine Cooling - Endeavor
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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
![MITSUBISHI ENDEAVOR 2004 Service Repair Manual Fig. 28: Connecting Special Tool MB991923
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
3. Start the engine and run it at idle. [Engine coolant temperature: 80°C
(176°F) or less]
4. Measure t](/manual-img/19/57105/w960_57105-1226.png "MITSUBISHI ENDEAVOR 2004 Service Repair Manual Fig. 28: Connecting Special Tool MB991923
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
3. Start the engine and run it at idle. [Engine coolant temperature: 80°C
(176°F) or less]
4. Measure t")
