Mitsubishi Evolution X. Manual — part 1286
AUTO A/C DIAGNOSIS
TSB Revision
HEATER, AIR CONDITIONING AND VENTILATION
55-95
STEP 3. Check the wiring harness between A/C-ECU
connector C-20 (terminal 26, 25, 27, 24 and 29) and
outside/inside air selection damper control motor
connector C-111 (terminals 2, 5, 4. 1 and 3).
Q: Are the wiring harness between A/C-ECU connector
C-20 (terminal 26, 25, 27, 24 and 29) and outside/inside
air selection damper control motor connector C-111
(terminals 2, 5, 4. 1 and 3) in good condition?
YES : Go to Step 4.
NO : Repair the wiring harness. Check that the A/C works
normally.
STEP 4. Replace the outside/inside air selection damper
control motor and check the trouble symptom again
Check the trouble symptom again.
Q: Is the check result satisfactory?
YES : The procedure is complete.
NO : Replace the A/C-ECU.
INSPECTION PROCEDURE 7: A/C Outlet Air Temperature does not Increase
Air Mixing Damper Control Motor Circuit
AIR MIXING
DAMPER CONTROL
MOTOR
A/C-ECU
AC708623
AUTO A/C DIAGNOSIS
TSB Revision
HEATER, AIR CONDITIONING AND VENTILATION
55-96
.
CIRCUIT OPERATION
If the air outlet temperature cannot be adjusted, the air mixing
damper control motor circuit may be failed.
.
TROUBLESHOOTING HINTS
• Malfunction of the air mixing damper control motor
• Malfunction of the A/C-ECU
• Damaged harness wires or connectors
DIAGNOSIS
Required Special Tools:
• MB991223: Harness Set
• MB992006: Extra Fine Probe
• MB991958: Scan Tool (M.U.T.-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: M.U.T.-III USB Cable
• MB991910: M.U.T.-III Main Harness A
STEP 1. Using scan tool MB991958, check for diagnostic
trouble code.
Check if an A/C-ECU DTC is set.
(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Check if the DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?
YES : Refer to DIAGNOSTIC TROUBLE CODE CHART
.
NO : Go to Step 2.
AC708951AS
C-20 (B)
Connectors: C-20, C-114
C-114
AC608435
Data link connector
MB991827
MB991824
MB991910
AB
AUTO A/C DIAGNOSIS
TSB Revision
HEATER, AIR CONDITIONING AND VENTILATION
55-97
STEP 2. Check air mixing damper control motor connector
C-114 and A/C-ECU connector C-20 for loose, corroded or
damaged terminals, or terminals pushed back in the
connector.
Q: Are air mixing damper control motor connector C-114
and A/C-ECU connector C-20 in good condition?
YES : Go to Step 3.
NO : Repair or replace the connector. Refer to GROUP
00E, Harness Connector Inspection
. Check
that the A/C works normally.
STEP 3. Check the wiring harness between A/C-ECU
connector C-20 (terminal 29, 35, 36, 34 and 28) and air
mixing damper control motor connector C-114 (terminals
3, 2, 5. 4 and 1).
Q: Are the wiring harness between A/C-ECU connector
C-20 (terminal 29, 35, 36, 34 and 28) and air mixing
damper control motor connector C-114 (terminals 3, 2,
5. 4 and 1) in good condition?
YES : Go to Step 4.
NO : Repair the wiring harness. Check that the A/C works
normally.
STEP 4. Replace the air mixing damper control motor and
check the trouble symptom again
Check the trouble symptom again.
Q: Is the check result satisfactory?
YES : The procedure is complete.
NO : Replace the A/C-ECU.
AUTO A/C DIAGNOSIS
TSB Revision
HEATER, AIR CONDITIONING AND VENTILATION
55-98
INSPECTION PROCEDURE 8: Air Outlet Vent cannot be Changed.
.
CIRCUIT OPERATION
If the air outlet cannot be switched, the mode selection damper
control motor circuit may be failed.
.
TROUBLESHOOTING HINTS
• Malfunction of the mode selection damper control motor
• Malfunction of the A/C-ECU
• Damaged harness wires or connectors
Mode Selection Damper Control Motor Circuit
MODE SELECTION
DAMPER CONTROL
MOTOR
A/C-ECU
AC708624
AC708951AT
C-20 (B)
Connectors: C-20, C-112
C-112
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