Mitsubishi Evolution X. Manual — part 1285
AUTO A/C DIAGNOSIS
TSB Revision
HEATER, AIR CONDITIONING AND VENTILATION
55-91
.
CIRCUIT OPERATION
If the blower motor speed cannot be changed, the power tran-
sistor circuit is suspected.
.
TROUBLESHOOTING HINTS
• Malfunction of the power transistor
• 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 power transistor connector C-119 for loose,
corroded or damaged terminals, or terminals pushed back
in the connector.
Q: Is power transistor connector C-119 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.
STEP 2. Measure the resistance at power transistor
connector C-119.
(1) Disconnect power transistor connector C-119, and measure
the resistance at the wiring harness side.
(2) Measure the resistance value between terminal 1 and
ground.
OK: The measured value should be 2 ohms or less
Q: Does the measured resistance value correspond with
this range?
YES : Go to Step 4.
NO : Go to Step 3.
AC708951AQ
Connectors: C-22, C-119
C-119
C-22 (B)
AC608255 BT
Connector C-119
(Harness side)
AUTO A/C DIAGNOSIS
TSB Revision
HEATER, AIR CONDITIONING AND VENTILATION
55-92
STEP 3. Check the wiring harness between power transitor
connector C-119 (terminal 1) and ground.
Q: Is the wiring harness between power transitor
connector C-119 (terminal 1) 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. The blower motor should
operate normally.
STEP 4. 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 5.
NO : Repair or replace the connector. Refer to GROUP
00E, Harness Connector Inspection
.The
blower motor should operate normally.
STEP 5. Check the wiring harness between A/C-ECU
connector C-22 (terminals 1 and 2) and power transitor
connector C-119 (terminals 2 and 4).
Q: Is the wiring harness between A/C-ECU connector C-22
(terminals 1 and 2) and power transitor connector C-119
(terminals 2 and 4) in good condition?
YES : Go to Step 6.
NO : Repair the wiring harness. The blower motor should
operate normally.
STEP 6. Replace the power transistor 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
55-93
INSPECTION PROCEDURE 6: Outside/Inside Air Changeover is not possible.
.
CIRCUIT OPERATION
If the outside/inside air selection damper control motor does not
operate normally, the outside/inside air selection damper con-
trol motor system may be defective.
.
TROUBLESHOOTING HINTS
• Malfunction of the outside/inside air selection damper con-
trol motor
• Malfunction of the A/C-ECU
• Damaged harness wires or connectors
Outside/Inside Damper Control Motor Circuit
OUTSIDE/INSIDE AIR
SELECTION DAMPER
CONTROL MOTOR
A/C-ECU
AC708622
AC708951AR
C-20 (B)
Connectors: C-20, C-111
C-111
AUTO A/C DIAGNOSIS
TSB Revision
HEATER, AIR CONDITIONING AND VENTILATION
55-94
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.
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
Check if an A/C-ECU DTC is set.
(1) Connect scan tool MB991958. Refer to "How to connect the
Scan Tool (M.U.T.-III)
(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.
STEP 2. Check outside/inside air selection damper control
motor connector C-111 and A/C-ECU connector C-20 for
loose, corroded or damaged terminals, or terminals
pushed back in the connector.
Q: Are outside/inside air selection damper control motor
connector C-111 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.
AC608435
Data link connector
MB991827
MB991824
MB991910
AB
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