Mitsubishi Galant 9G. Manual — part 259

MANUAL A/C DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-112

INSPECTION PROCEDURE 3: Outside/Inside Air Changeover is not possible.

A/C-ECU

OUTSIDE/INSIDE
AIR SELECTION
DAMPER CONTROL
MOTOR

IGNITION
SWITCH (IG2)

JUNCTION
BLOCK

JOINT
CONNECTOR (2)

MOTOR DRIVE
CIRCUIT

Outside/Inside Air Selection Motor Circuit

AC305231AZ

CONNECTOR: C-03

AC305233BK

CONNECTORS: C-09, C-106

C-09 (B)

C-106

MANUAL A/C DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-113

.

CIRCUIT OPERATION

If the outside/inside air selection damper control
motor does not operate normally, the outside/inside
air selection damper control motor system may be
defective.

.

TROUBLESHOOTING HINTS

• Malfunction of the outside/inside air selection

damper control motor

• Malfunction of the A/C-ECU

• Damaged harness wires or connectors

DIAGNOSIS

Required Special Tool:

• MB991223: Test Harness Set

STEP 1. Check the defogger and A/C operations.
Q: Do the defogger and A/C work normally?

YES : Go to Step 2.
NO : Refer to Inspection procedure 10 "Malfunction of the

A/C-ECU power supply system

P.55A-170

."

STEP 2. Check outside/inside air selection damper control
motor connector C-106 for loose, corroded or damaged
terminals, or terminals pushed back in the connector.
Q: Is outside/inside air selection damper control motor

connector C-106 in good condition?
YES : Go to Step 3.
NO : Repair or replace the connector. Refer to GROUP

00E, Harness Connector Inspection

P.00E-2

. Check

that the outside/inside air selection damper control
motor works normally.

AC305415

CONNECTORS: C-211, C-215

JUNCTION BLOCK
(FRONT VIEW)

C-215

C-211

BA

AC305233

HARNESS SIDE

BJ

CONNECTOR: C-106

MANUAL A/C DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-114

STEP 3. Measure the voltage at outside/inside air selection
damper control motor connector C-106.
(1) Disconnect outside/inside air selection damper control

motor connector C-106, and measure the voltage at the
harness side.

(2) Turn the ignition switch to the "ON" position.

(3) Measure the voltage between terminal 1 and ground.

• The measured value should be approximately 12 volts

(battery positive voltage).

Q: Does the measured voltage correspond with this range?

YES : Go to Step 5.
NO : Go to Step 4.

STEP 4. Check the wiring harness between outside/inside
air selection damper control motor connector C-106
(terminal 1) and the ignition switch (IG2).

AC305233

HARNESS SIDE

BJ

CONNECTOR: C-106

AC209365

CONNECTOR C-106
(HARNESS SIDE)

GR

AC305233

HARNESS SIDE

BJ

CONNECTOR: C-106

MANUAL A/C DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-115

NOTE: Also check joint connector C-03, junction block connec-
tors C-211 and C-215 for loose, corroded, or damaged termi-
nals, or terminals pushed back in the connector. If intermediate
connector C-03, junction block connector C-211 or C-215 is
damaged, repair or replace the connector as described in
GROUP 00E, Harness Connector Inspection

P.00E-2

.

Q: Is the wiring harness between outside/inside air

selection damper control motor connector C-106
(terminal 1) and the ignition switch (IG2) 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.00-14

.

NO : Repair the wiring harness. Check that the

outside/inside air selection damper control motor
works normally.

AC305231BP

CONNECTOR: C-03

AC305416

CONNECTORS: C-211, C-215

JUNCTION BLOCK
(FRONT VIEW)

C-215

C-211

HARNESS SIDE

C-211

HARNESS SIDE

C-215

AK