Mitsubishi Lancer Evolution IX. Manual — part 551
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TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-77
STEP 7. Voltage measurement at C-36 A/C-ECU
connector.
(1) Disconnect the connector, and measure at the
wiring harness side.
(2) Measure the voltage between terminal 3 and
earth.
OK: System voltage
Q: Is the check result normal?
YES :
Replace the automatic A/C control panel
(A/C-ECU).
NO :
Go to Step 8.
STEP 8. Connector check: C-36 A/C-ECU
connector
Q: Is the check result normal?
YES :
Go to Step 9.
NO :
Repair the connector.
STEP 9. Check the wiring harness between C-36
A/C-ECU connector terminal No.3 and battery.
AC504622AB
Connector: C-36 <LHD>
Harness side
C-36 (B)
AC504618AJ
Connector: C-36 <RHD>
Harness side
C-36 (B)
AC301541JX
Connector C-36
(Harness side)
AC504622AB
Connector: C-36 <LHD>
Harness side
C-36 (B)
AC504618AJ
Connector: C-36 <RHD>
Harness side
C-36 (B)
AC504622AB
Connector: C-36 <LHD>
Harness side
C-36 (B)
AC504618AJ
Connector: C-36 <RHD>
Harness side
C-36 (B)
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TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-78
NOTE:
Prior to the wiring harness inspection, check interme-
diate connector C-129 and joint connector C-05, and
repair if necessary.
• Check the A/C-ECU power supply (battery
back-up) line for open or short circuit.
Q: Is the check result normal?
YES :
The trouble can be an intermittent
malfunction (Refer to GROUP 00, How to
Cope with Intermittent Malfunction
NO :
Repair the wiring harness.
AC504641AB
Connectors: C-05, C-129 <LHD>
C-129
C-129
C-05
C-05 (GR)
AC504624AD
Connectors: C-05, C-129 <RHD>
C-05
C-129
C-129
C-05 (GR)
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TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-79
Inspection Procedure 10: A/C Compressor power supply system.
COMMENTS ON TROUBLE SYMPTOM
If the power is not supplied to the A/C compressor,
the A/C compressor circuit system may be defective.
POSSIBLE CAUSES
• Malfunction of the A/C compressor relay
• Damaged the wiring harness or connectors
A/C Compressor Circuit
Wire colour code
B : Black LG : Light green G : Green L : Blue W : White
Y : Yellow SB : Sky blue BR : Brown O : Orange
GR : Grey R : Red P : Pink V : Violet PU : Purple
A/C
COMPRESSOR
RELAY
A/C
COMPRESSOR
A/C
REFRIGERANT
TEMPERATURE
SWITCH
MAGNETIC
CLUTCH
IGNITION
SWITCH (IG2)
ENGINE-ECU
BATTERY
RELAY
BOX
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TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-80
DIAGNOSIS PROCEDURE
STEP 1. Connector check: B-13X A/C
compressor relay connector
Q: Is the check result normal?
YES :
Go to Step 2.
NO :
Repair the connector.
STEP 2. Check the A/C compressor relay
continuity.
Refer to
Q: Is the A/C compressor relay in good condition?
YES :
Go to Step 3.
NO :
Replace the A/C compressor relay.
STEP 3. Voltage measurement at B-13X A/C
compressor relay connector.
(1) Remove the relay, and measure at the relay box
side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal 2 and
body earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 5.
NO :
Go to Step 4.
AC504760AB
Connector: B-13X
Front of
vehicle
1
3
2
4
Relay box side
AC504760AB
Connector: B-13X
Front of
vehicle
1
3
2
4
Relay box side
AC301541KI
Connector B-13X
(Relay box side)
Front of
vehicle
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