Mitsubishi Evolution X. Manual - part 1284

 

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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 

supply system 

P.55-101

."

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 

P.00E-2

.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 

P.00E-2

.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 

P.00E-2

.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 

P.00-15

.

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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