Mitsubishi Outlander XL. Manual — part 429
ZC603029
A-34X
A-35X
A-36X
Fusible link (28), (29) and
connectors: A-34X, A-35X, A-36X
Fusible
link (28)
Fusible
link (29)
AA00
ZC603062
A-43
Connectors: A-05, A-43
A-05
AA00
ZC603093
C-312
Connector: C-312
ETACS-ECU
AA00
CIRCUIT OPERATION
⦆
The cooling fan motor is energized by the fusible
link number 28 and fusible link number 29.
⦆
The ETACS-ECU controls the radiator fan relay, fan
control relay, and condenser fan relay for driving the
cooling fan motor by using the input signal
transmitted from the A/C switch, engine coolant
temperature sensor, and output shaft speed sensor.
TECHNICAL DESCRIPTION
If the cooling fan does not operate, the following cases
may have occurred.
⦆
Malfunction of power supply or ground circuit
⦆
Malfunction of cooling fan motor
⦆
Malfunction of fan control relay, radiator fan relay or
condenser fan relay
⦆
Malfunction of ETACS-ECU
⦆
Abnormality of engine coolant temperature sensor
input signal transmitted to ECM
⦆
Abnormality of output shaft speed sensor input
signal transmitted to TCM
⦆
Abnormality of A/C switch input signal transmitted
to A/C-ECU
TROUBLESHOOTING HINTS
⦆
Malfunction of fusible link
⦆
Malfunction of fan control relay
⦆
Malfunction of radiator fan relay
⦆
Malfunction of condenser fan relay
⦆
Malfunction of cooling fan motor
⦆
Damaged wiring harness or connector
⦆
Malfunction of ETACS-ECU
DIAGNOSIS
Required Special Tools:
⦆
MB991958: Scan Tool (M.U.T.-III Sub Assembly)
⦆
MB991824: V.C.I.
⦆
MB991827: M.U.T.-III USB Cable
⦆
MB991910: M.U.T.-III Main Harness A
⦆
MB991223: Harness Set
ENGINE COOLING
14-7
ENGINE COOLING DIAGNOSIS
⦆
MB992006: Extra Fine Probe
STEP 1. M.U.T.-III other system diagnosis codes
⦆
Confirm whether the diagnosis codes are output from ETACS-
ECU (Refer to GROUP 54Ad, Diagnosis - Diagnostic
Function P.54Ad-5).
Q:Is the diagnostic trouble code output?
YES:
Perform the troubleshooting of ETACS-ECU (Refer to
GROUP 54Ad, Diagnosis - Diagnostic Trouble Code Chart P.
54Ad-8).
NO:
Go to Step 2.
STEP 2. Check the cooling fan relay.
Refer to P.14-17.
Q:Is the check result normal?
YES:
Go to Step 3.
NO:
Replace the relay.
STEP 3. Check the radiator fan relay connector A-34X,
condenser fan relay connector A-35X and fan control relay
connector A-36X.
Check for the contact with terminals.
Q:Is the check result normal?
YES:
Go to Step 4.
NO:
Repair the defective connector.
STEP 4. Check the cooling fan motor.
Refer to P.14-19.
Q:Is the check result normal?
YES:
Go to Step 5.
NO:
Replace the cooling fan motor.
STEP 5. Check condenser fan motor connector A-43 and
radiator fan motor connector A-05.
Check for the contact with terminals.
Q:Is the check result normal?
YES:
Go to Step 6.
NO:
Repair the defective connector.
STEP 6. Measure the voltage at radiator fan relay connector
A-34X.
ZC6036400000
Relay box
side
A-34X
Connector: A-34X
(1)
Remove the radiator fan relay, and measure at relay box
side.
(2)
Measure the voltage between terminal number 3 and ground.
Measure the voltage between terminal number 4 and ground.
OK: System voltage
Q:Is the check result normal?
YES:
Go to Step 8.
NO:
Go to Step 7.
14-8
ENGINE COOLING
ENGINE COOLING DIAGNOSIS
STEP 7. Check the harness between radiator fan relay
connector A-34X (terminal 3, 4) and fusible link number 29.
⦆
Check the power supply line for short or open circuit.
Q:Is the check result normal?
YES:
An intermittent malfunction is suspected (Refer to
GROUP 00, How to Use Troubleshooting/Inspection Service
Points - How to Cope with Intermittent Malfunctions P.
00-15).
NO:
Repair the wiring harness.
STEP 8. Measure the voltage at fan control relay connector
A-36X.
ZC6036420000
Relay box
side
A-36X
Connector: A-36X
(1)
Remove the fan control relay, and measure at relay box side.
(2)
Measure the voltage between terminal number 1 and ground.
OK: System voltage
Q:Is the check result normal?
YES:
Go to Step 10.
NO:
Go to Step 9.
STEP 9. Check the harness between fan control relay
connector A-36X (terminal 1) and fusible link number 28.
⦆
Check the power supply line for short or open circuit.
Q:Is the check result normal?
YES:
An intermittent malfunction is suspected (Refer to
GROUP 00, How to Use Troubleshooting/Inspection Service
Points - How to Cope with Intermittent Malfunctions P.
00-15).
NO:
Repair the relay box.
STEP 10. Measure the voltage at condenser fan relay
connector A-35X.
ZC6036410000
Relay box
side
A-35X
Connector: A-35X
(1)
Remove the condenser fan relay, and measure at relay box
side.
(2)
Measure the voltage between terminal number 3 and ground.
Measure the voltage between terminal number 4 and ground.
OK: System voltage
Q:Is the check result normal?
YES:
Go to Step 12.
NO:
Go to Step 11.
STEP 11. Check the harness between condenser fan relay
connector A-35X (terminal 3, 4) and fusible link number 28.
⦆
Check the power supply line for short or open circuit.
Q:Is the check result normal?
YES:
An intermittent malfunction is suspected (Refer to
GROUP 00, How to Use Troubleshooting/Inspection Service
ENGINE COOLING
14-9
ENGINE COOLING DIAGNOSIS
Points - How to Cope with Intermittent Malfunctions P.
00-15).
NO:
Repair the relay box.
STEP 12. Check the harness between radiator fan relay
connector A-34X (terminal 2) and radiator fan motor
connector A-05 (terminal 1).
⦆
Check the output line for short or open circuit.
Q:Is the check result normal?
YES:
Go to Step 13.
NO:
Repair the wiring harness.
STEP 13. Check the harness between fan control relay
connector A-36X (terminal 2) and radiator fan motor
connector A-05 (terminal 2).
⦆
Check the output line for short or open circuit.
Q:Is the check result normal?
YES:
Go to Step 14.
NO:
Repair the wiring harness.
STEP 14. Check for continuity at fan control relay connector
A-36X.
ZC6036420000
Relay box
side
A-36X
Connector: A-36X
(1)
Remove the fan control relay, and measure at relay box side.
(2)
Check that there is continuity between terminal number 5 and
body ground.
OK: Continuity (less than 2 ohms)
Q:Is the check result normal?
YES:
Go to Step 16.
NO:
Go to Step 15.
STEP 15. Check the harness between fan control relay
connector A-36X (terminal 5) and ground.
⦆
Check the ground line for open circuit.
Q:Is the check result normal?
YES:
An intermittent malfunction is suspected (Refer to
GROUP 00, How to Use Troubleshooting/Inspection Service
Points - How to Cope with Intermittent Malfunctions P.
00-15).
NO:
Repair the wiring harness.
STEP 16. Check the harness between fan control relay
connector A-36X (terminal 4) and condenser fan relay
connector A-35X (terminal 2).
⦆
Check the output line for short or open circuit.
Q:Is the check result normal?
YES:
Go to Step 17.
NO:
Repair the wiring harness.
14-10
ENGINE COOLING
ENGINE COOLING DIAGNOSIS
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