Mitsubishi Galant 9G. Manual — part 279

MANUAL A/C DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-192

STEP 8. Measure the voltage at A/C compressor assembly
connector B-28.
(1) Disconnect A/C compressor assembly connector B-28 and

measure the voltage at the relay box side.

AC305214

B-28 (B)

HARNESS SIDE

AD

CONNECTOR: B-28 <2.4L>

AC305218

B-28 (B)

HARNESS SIDE

AB

CONNECTOR: B-28 <3.8 L>

MANUAL A/C DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-193

(2) Disconnect powertrain control module connector B-21 and

ground harness side terminal No.81.

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

(4) A/C compressor assembly connector B-28 terminal 1 and

ground.

• The measured value should be approximately 12 volts

(battery positive voltage).

Q: Is the measured voltage approx. 12 volts?

YES : Go to Step 15.
NO : Go to Step 9.

AC305216

B-21 (B)

AC

CONNECTOR: B-21 <2.4L>

HARNESS SIDE

51

52

53

54

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AC305229

B-21 (B)

AB

HARNESS SIDE

51

52

53

54

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63

64

65

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81

82

83

CONNECTOR: B-21 <3.8 L>

AC306468

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83

AC306468

CONNECTOR B-21
(HARNESS SIDE)

AD

AC209365

CONNECTOR B-28
(HARNESS SIDE)

GS

MANUAL A/C DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-194

STEP 9. Measure the voltage at A/C compressor clutch
relay connector B-18X.

CAUTION

The top and bottom of the A/C compressor connector are
difficult to identify. Prior to inspection, confirm the triangle
mark on the relay box.
(1) Disconnect A/C compressor connector B-18X and measure

the voltage at the relay box side.

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

(3) Measure the voltage between terminal 2 and ground.

• The measured value should be approximately 12 volts

(battery positive voltage).

Q: Is the measured voltage approx. 12 volts?

YES : Go to Step 11.
NO : Go to Step 10.

STEP 10. Check the wiring harness between A/C
compressor clutch relay connector B-18X (terminal 2) and
the ignition switch (IG2).

AC305977AJ

CONNECTOR: B-18X

RELAY BOX SIDE

FRONT OF
VEHICLE

JUNCTION BLOCK
TRIANGLE MARK

AC209365GT

CONNECTOR B-18X
(RELAY BOX SIDE)

AC305977AJ

CONNECTOR: B-18X

RELAY BOX SIDE

FRONT OF
VEHICLE

JUNCTION BLOCK
TRIANGLE MARK

MANUAL A/C DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-195

NOTE: Also check intermediate connector A-13, joint connec-
tor C-01, junction block connectors C-214 and C-215 for loose,
corroded, or damaged terminals, or terminals pushed back in
the connector. If intermediate connector A-13, joint connector
C-01, junction block connector C-214 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 A/C compressor clutch

relay connector B-18X (terminal 2) 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 air

conditioning works normally.

AC305210

A-13 (GR)

AR

CONNECTOR: A-13

AC305231

CONNECTOR: C-01

BO

AC305416

CONNECTORS: C-214, C-215

JUNCTION BLOCK
(FRONT VIEW)

C-215

HARNESS SIDE

C-214

C-214

HARNESS SIDE

C-215

10

1

6

14

5

12

13

4

11

7

2

3

8

9

AL