Mitsubishi Evolution X. Manual — part 1281
AUTO A/C DIAGNOSIS
TSB Revision
HEATER, AIR CONDITIONING AND VENTILATION
55-75
TECHNICAL DESCRIPTION (COMMENT)
The A/C-ECU power system may be defective if the air condi-
tioning, 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-22 for loose,
corroded or damaged terminals, or terminals pushed back
in the connector.
Q: Is A/C-ECU connector C-22 in good condition?
YES : Go to Step 2.
NO : Repair or replace the connector. Refer to GROUP
00E, Harness Connector Inspection
. Check
that the A/C works normally.
STEP 2. Measure the voltage at A/C-ECU connector C-22.
(1) Disconnect A/C-ECU connector C-22 and measure the
voltage at the harness side.
(2) Turn the ignition switch to the "ON" position.
(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
. Check
that the A/C works normally.
AC608254 CJ
Connector C-22
(Harness side)
AUTO A/C DIAGNOSIS
TSB Revision
HEATER, AIR CONDITIONING AND VENTILATION
55-76
STEP 4. Check the wiring harness between A/C-ECU
connector C-22 (terminal 15) and ETACS-ECU connector
C-317 (terminal 5).
Q: Is the wiring harness between A/C-ECU connector C-22
(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
Troubleshooting/Inspection Service Points
− How to
Cope with Intermittent Malfunctions
.
NO : Repair the wiring harness. Check that the A/C works
normally.
STEP 5. Measure the voltage at A/C-ECU connector C-22.
(1) Disconnect A/C-ECU connector C-22 and measure the
voltage at the harness side.
(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-22 (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
.
Q: Is the wiring harness between A/C-ECU connector C-22
(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
.
NO : Repair the wiring harness. Check that the A/C works
normally.
AC608254 CK
Connector C-22
(Harness side)
AUTO A/C DIAGNOSIS
TSB Revision
HEATER, AIR CONDITIONING AND VENTILATION
55-77
STEP 7. Measure the resistance at A/C-ECU connector
C-22.
(1) Disconnect A/C-ECU connector C-22, and measure at the
wiring harness side.
(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.
STEP 8. Check the wiring harness between A/C-ECU
connector C-22 (terminal 14) and the ground.
Q: Is the wiring harness between A/C-ECU connector C-22
(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
.
NO : Repair the wiring harness. Check that the A/C works
normally.
AC608255 BR
Connector C-22
(Harness side)
AUTO A/C DIAGNOSIS
TSB Revision
HEATER, AIR CONDITIONING AND VENTILATION
55-78
INSPECTION PROCEDURE 3: The Compressor does not Work.
A/C Compressor Assembly Circuit
A/C
COMPRESSOR
CLUTCH RELAY
A/C
COMPRESSOR
ASSEMBLY
A/C
REFRIGERANT
TEMPERATURE
SWITCH
A/C
COMPRESSOR
CLUTCH
ENGINE CONTROL MODULE
RELAY
BOX
FUSIBLE
LINK
36
AC708618
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