Mitsubishi Evolution X. Manual — part 1284
AUTO A/C DIAGNOSIS
TSB Revision
HEATER, AIR CONDITIONING AND VENTILATION
55-87
STEP 2. Measure the voltage at blower motor connector
C-115.
(1) Disconnect blower motor connector C-115, and measure
the voltage at the wiring harness side.
(2) Turn the ignition switch to the "ON" position.
(3) Turn the blower switch to the "Maximum air volume"
position.
(4) Measure the voltage between terminal 1 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 3.
NO : Refer to Inspection procedure 9, "Blower motor power
."
STEP 3. 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 4.
NO : Repair or replace the connector. Refer to GROUP
00E, Harness Connector Inspection
.The
blower motor should operate normally.
STEP 4. Check the blower fan and motor operation.
Check that the motor turns when applying battery power
between the connector terminals. Also check to see that there
is no abnormal sound emitted from the motor at this time..
Q: Is there any abnormal noise?
YES : Go to Step 5.
NO : Replace the blower relay. The blower motor should
operate normally.
STEP 5. 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 6.
NO : Repair or replace the connector. Refer to GROUP
00E, Harness Connector Inspection
.The
blower motor should operate normally.
AC608254 CO
Connector C-115
(Harness side)
AC611918
AC
AUTO A/C DIAGNOSIS
TSB Revision
HEATER, AIR CONDITIONING AND VENTILATION
55-88
STEP 6. Check the wiring harness between A/C-ECU
connector C-22 (terminal 1) and blower motor connector
C-115 (terminal 1).
Q: Is the wiring harness between A/C-ECU connector C-22
(terminal 1) and blower motor connector C-115 (terminal
1) in good condition?
YES : Go to Step 7.
NO : Repair the wiring harness. The blower motor should
operate normally.
STEP 7. 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 8.
NO : Repair or replace the connector. Refer to GROUP
00E, Harness Connector Inspection
.The
blower motor should operate normally.
STEP 8. 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 10.
NO : Go to Step 9.
STEP 9. 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.
AC608255 BS
Connector C-119
(Harness side)
AUTO A/C DIAGNOSIS
TSB Revision
HEATER, AIR CONDITIONING AND VENTILATION
55-89
STEP 10. 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 11.
NO : Repair the wiring harness. The blower motor should
operate normally.
STEP 11. 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
55-90
INSPECTION PROCEDURE 5: Blower Air Amount cannot be Changed.
Blower Motor Circuit
FUSIBLE
LINK
37
BLOWER
RELAY
ETACS-
ECU
A/C-ECU
BLOWER
MOTOR
POWER
TRANSISTER
AC708621
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