Mitsubishi Outlander XL. Manual - part 1193

INSPECTION PROCEDURE 2: Malfunction of the A/C-ECU Power Supply System.

M15502000173USA0000010000

A/C-ECU Power Supply Circuit

IGNITION
SWITCH (IG1)

A/C-ECU

ETACS
-ECU

RELAY
BOX

POWER
SOURCE

POWER
SOURCE

IG1
RELAY

FUSIBLE
LINK

34

FUSIBLE
LINK

36

ZC6008780029

Connectors: C-307, C-309, C-317

C-307 (B)

C-309 (B)

C-317

ZC6008760001

Connector: C-109

C-109 (B)

AIR CONDITIONING

55A-63

MANUAL A/C DIAGNOSIS

 

TECHNICAL DESCRIPTION (COMMENT)
The A/C-ECU power system may be defective if the
air  conditioning,  defogger,  and  outside/inside  air
selection damper motor all do not operate normally.

TROUBLESHOOTING HINTS

｠

Malfunction of the A/C-ECU

｠

Damaged harness wires or connectors

DIAGNOSIS

Required Special Tool:

｠

MB991223: Test Harness Set

STEP 1. Check A/C-ECU connector C-109 for loose,
corroded or damaged terminals, or terminals pushed back
in the connector.

Q:Is A/C-ECU connector C-109 in good condition?

YES:

 Go to Step 2.

NO:

 Repair or replace the connector. Refer to GROUP 00E,

Harness Connector Inspection P.00E-2. Check that the A/C
works normally.

STEP 2. Measure the voltage at A/C-ECU connector C-109.

(1)

Disconnect  A/C-ECU  connector  C-109  and  measure  the
voltage at the harness side.

(2)

Turn the ignition switch to the "ON" position.

ZC6022230014

Harness side: C-109

(3)

Measure the voltage between terminal 15 and ground.

｠

The  measured  value  should  be  approximately  12  volts
(battery positive voltage).

Q:Is the measured voltage approximately 12 volts?

YES:

 Go to Step 5.

NO:

 Go to Step 3.

STEP 3. Check ETACS-ECU connector C-317 for loose,
corroded or damaged terminals, or terminals pushed back
in the connector.

Q:Is ETACS-ECU connector C-317 in good condition?

YES:

 Go to Step 4.

NO:

 Repair or replace the connector. Refer to GROUP 00E,

Harness Connector Inspection P.00E-2. Check that the A/C
works normally.

STEP 4. Check the wiring harness between A/C-ECU
connector C-109 (terminal 15) and ETACS-ECU connector
C-317 (terminal 5).

Q:Is the wiring harness between A/C-ECU connector C-109

(terminal 15) and ETACS-ECU connector C-317 (terminal

5) in good condition?

YES:

 It can be assumed that this malfunction is

intermittent. Refer to GROUP 00, How to Use

55A-64

AIR CONDITIONING

MANUAL A/C DIAGNOSIS

Troubleshooting/Inspection Service Points - How to Cope
with Intermittent Malfunctions P.00-15.

NO:

 Repair the wiring harness. Check that the A/C works

normally.

STEP 5. Measure the voltage at A/C-ECU connector C-109.

(1)

Disconnect  A/C-ECU  connector  C-109  and  measure  the
voltage at the harness side.

ZC6022230015

Harness side: C-109

(2)

Measure the voltage between terminal 13 and ground.

｠

The  measured  value  should  be  approximately  12  volts
(battery positive voltage).

Q:Is the measured voltage approximately 12 V?

YES:

 Go to Step 7.

NO:

 Go to Step 6.

STEP 6. Check the wiring harness between A/C-ECU
connector C-109 (terminal 13) and the FUSIBLE LINK (36).

NOTE: 

Also check ETACS-ECU connector C-317 for loose,

corroded, or damaged terminals, or terminals pushed back in
the connector. If ETACS-ECU connector C-317 is damaged,
repair or replace the connector as described in GROUP 00E,
Harness Connector Inspection P.00E-2.

Q:Is the wiring harness between A/C-ECU connector C-109

(terminal  13)  and  the  FUSIBLE  LINK  (36)  in  good

condition?

YES:

 It can be assumed that this malfunction is

intermittent. 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. Check that the A/C works

normally.

STEP 7. Measure the resistance at A/C-ECU connector
C-109.

(1)

Disconnect A/C-ECU connector C-109, and measure at the
wiring harness side.

AC6042490000

Harness side: C-109

(2)

Measure the resistance between terminal 14 and ground.

｠

The measured value should be 2 ohms or less.

Q:Does the measured resistance value correspond with this

range?

YES:

 Replace the A/C-ECU, and check that the A/C works

normally.

NO:

 Go to Step 8.

AIR CONDITIONING

55A-65

MANUAL A/C DIAGNOSIS

STEP 8. Check the wiring harness between A/C-ECU
connector C-109 (terminal 14) and the ground.

Q:Is the wiring harness between A/C-ECU connector C-109

(terminal 14) and ground in good condition?

YES:

 It can be assumed that this malfunction is

intermittent. 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. Check that the A/C works

normally.

55A-66

AIR CONDITIONING

MANUAL A/C DIAGNOSIS