Mitsubishi Evolution X. Manual — part 1283
AUTO A/C DIAGNOSIS
TSB Revision
HEATER, AIR CONDITIONING AND VENTILATION
55-83
STEP 10. Check the wiring harness between A/C
compressor clutch relay connector A-17X (terminals 2 and
4) and the fusible link (36).
Q: Is the wiring harness between A/C compressor clutch
relay connector A-17X (terminals 2 and 4) 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
.
NO : Repair the wiring harness. Check that the A/C works
normally.
STEP 11. Check the wiring harness between A/C
compressor clutch relay connector A-17X (terminal 3) and
A/C compressor assembly connector B-110 (terminal 1).
Q: Is the wiring harness between A/C compressor clutch
relay connector A-17X (terminal 3) and A/C compressor
assembly connector B-110 (terminal 1) in good
condition?
YES : Go to Step 12.
NO : Repair the wiring harness. Check that the A/C works
normally.
STEP 12. Check the wiring harness between engine
control module connector B-10 (terminal 102) and A/C
compressor clutch relay connector A-17X (terminal 1).
Q: Is the wiring harness between engine control module
connector B-10 (terminal 102) and A/C compressor
clutch relay connector A-17X (terminal 1) 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
.
NO : Repair the wiring harness. Check that the A/C works
normally.
AUTO A/C DIAGNOSIS
TSB Revision
HEATER, AIR CONDITIONING AND VENTILATION
55-84
STEP 13. Check the refrigerant temperature switch.
CAUTION
Do not heat more than necessary.
(1) Dip the metal part of the cooling temperature switch into
engine oil and increase the oil temperature using a gas
burner or similar.
(2) When the oil temperature reaches the standard value,
check that resistance is supplied between the terminals.
Standard value:
NOTE: When the oil temperature is 155
°
C (311
°
F) or more
and there is no continuity, the resistance will not be 2
Ω
or
lower until the oil temperature reduces to 125
°
C (257
°
F) or
less.
Q: Is the refrigerant temperature switch operating
properly?
YES : Go to Step 14.
NO : Replace the refrigerant temperature switch. Check
that the A/C works normally.
STEP 14. Replace the A/C-ECU.
Q: Does the A/C operate normally?
YES : No action is necessary and testing is complete.
NO : Replace the engine control module. Check that the
A/C works normally.
Item
Temperature
Less than 2 ohms
Slightly below 155
° C (311° F)
No continuity
155
° C (311° F) or more
AC100787
Thermometer
Engine oil
AG
AC100810
Less than 2
Ω
No continuity
125˚C
(257˚F)
155˚C
(311˚F)
OIL TEMPERATURE
AV
AUTO A/C DIAGNOSIS
TSB Revision
HEATER, AIR CONDITIONING AND VENTILATION
55-85
INSPECTION PROCEDURE 4: Blower Fan and Motor do not Turn.
Blower Motor Circuit
FUSIBLE
LINK
37
BLOWER
RELAY
ETACS-
ECU
A/C-ECU
BLOWER
MOTOR
POWER
TRANSISTER
AC708621
AUTO A/C DIAGNOSIS
TSB Revision
HEATER, AIR CONDITIONING AND VENTILATION
55-86
.
CIRCUIT OPERATION
If the blower motor does not operate, the blower relay system is
suspected.
.
TROUBLESHOOTING HINTS
• Malfunction of the power transistor
• Malfunction of the blower motor
• Malfunction of the A/C-ECU
• Damaged harness wires or connectors
DIAGNOSIS
Required Special Tools:
• MB991223: Harness Set
• MB992006: Extra Fine Probe
STEP 1. Check blower motor connector C-115 for loose,
corroded or damaged terminals, or terminals pushed back
in the connector.
Q: Is blower motor connector C-115 in good condition?
YES : Go to Step 2.
NO : Repair or replace the connector. Refer to GROUP
00E, Harness Connector Inspection
.The
blower motor should operate normally.
AC708951AP
Connectors: C-22, C-115, C-119
C-119
C-22 (B)
C-115
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