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
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