Mitsubishi Evolution X. Manual — part 1280
AUTO A/C DIAGNOSIS
TSB Revision
HEATER, AIR CONDITIONING AND VENTILATION
55-71
SYMPTOM CHART
M1552009900729
CAUTION
During diagnosis, a DTC code associated with
other system may be set when the ignition switch
is turned on with connector(s) disconnected. On
completion, confirm all systems for DTC code(s).
If DTC code(s) are set, erase them all.
Symptom
Inspection
procedure
Reference
page
When the A/C is operation, temperature inside the passenger
compartment does not decrease (Cool air is not emitted).
1
Malfunction of the A/C-ECU power supply system.
2
The compressor does not work.
3
Blower fan and motor do not turn.
4
Blower air amount cannot be changed.
5
Outside/inside air changeover is not possible.
6
A/C outlet air temperature does not increase.
7
Air outlet vent cannot be changed.
8
Blower motor power supply system.
9
AUTO A/C DIAGNOSIS
TSB Revision
HEATER, AIR CONDITIONING AND VENTILATION
55-72
SYMPTOM PROCEDURES
INSPECTION PROCEDURE 1: When the A/C is Operation, Temperature Inside the Passenger
Compartment does not Decrease (Cool Air is not Emitted).
.
TECHNICAL DESCRIPTION (COMMENT)
The blower system or the compressor system may
be defective if there is no cool air coming from the
vents.
.
TROUBLESHOOTING HINTS
• Malfunction of blower motor
• Malfunction of A/C-ECU
• Malfunction of A/C compressor
DIAGNOSIS
STEP 1. Using scan tool MB991958, read the 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 that the blower motor operation when the
blower knob is moved to the "Maximum air volume"
position.
(1) Turn the ignition switch to the "ON" position.
(2) Turn the blower knob to the "Maximum air volume" position
Q: Does the blower motor operate when the blower knob is
moved to the "Maximum air volume" position?
YES : Go to Step 3.
NO : Refer to Inspection procedure 4 "Blower fan and
motor do not turn
."
AC608435
Data link connector
MB991827
MB991824
MB991910
AB
AUTO A/C DIAGNOSIS
TSB Revision
HEATER, AIR CONDITIONING AND VENTILATION
55-73
STEP 3. Check the rear window defogger and
outside/inside air selection damper control motor
operation.
(1) Turn the ignition switch to the "ON" position.
(2) Check the engine running.
(3) Check the operations of rear window defogger and
outside/inside air selection damper control motor.
Q: Do the rear window defogger and outside/inside air
selection damper control motor work normally?
YES : Refer to Inspection procedure 3 "The A/C compressor
does not Work
NO : Refer to Inspection procedure 2, "Malfunction of the
A/C-ECU power supply system
AUTO A/C DIAGNOSIS
TSB Revision
HEATER, AIR CONDITIONING AND VENTILATION
55-74
INSPECTION PROCEDURE 2: Malfunction of the A/C-ECU Power Supply System.
.
A/C-ECU Power Supply Circuit
IGNITION
SWITCH (IG1)
A/C-ECU
ETACS
-ECU
RELAY BOX
(ENGINE
COMPARTMENT)
POWER
SUPPLY
POWER
SUPPLY
IG1
RELAY
FUSIBLE
LINK
34
FUSIBLE
LINK
36
AC708617
AC708951AO
Connector: C-22
C-22 (B)
AC708972AB
Connector: C-317
Junction block
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