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