Mitsubishi Colt Ralliart. Manual — part 533
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55A-40
Q: Is the check result normal?
YES :
Go to Step 6.
NO :
Repair the wiring harness.
Step 6. Drive belt tension check
Refer to GROUP 11A
− Engine adjustment
Q: Is the check result normal?
YES :
Go to Step 7.
NO :
Replace the drive belt.
Step 7. Check the magnetic clutch for A/C
compressor
Refer to
.
Q: Is the check result normal?
YES :
Go to Step 8.
NO :
Replace the magnetic clutch.
Step 8. Check the air gap.
AC208396
Thickness
gauge
AB
Use a feeler gauge and check that the air gap is
within the standard value.
Standard value: 0.25
− 0.5 mm
Q: Is the check result normal?
YES :
Go to Step 9.
NO :
Adjust the air gap.
Step 9. Check the refrigerant temperature switch
(1) Remove the refrigerant temperature switch.
Refer to
.
(2) Refer to
and check it.
Q: Is the check result normal?
YES :
Go to Step 10.
NO :
Replace the refrigerant temperature switch.
Step 10. Check the refrigerant level.
Refer to
.
Q: Is the refrigerant level correct?
YES :
Go to Step 11.
NO :
Correct the refrigerant level (Refer to
On-vehicle Service
).
Step 11. Replace the A/C compressor assembly
(1) Replace the A/C compressor assembly.
(2) Operates the A/C.
(3) Check that the A/C indicator lamp does not flash.
Q: Is the check result normal?
YES :
This diagnosis is complete.
NO :
Replace the combination meter (meter and
A/C-ECU).
Main
Index
Group
TOC
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55A-41
Inspection Procedure 10: A/C pressure sensor system
A/C PRESSURE
SENSOR
Wire colour code
B : Black LG : Light green G : Green L : Blue W : White Y : Yellow SB : Sky blue
BR : Brown O : Orange GR : Gray R : Red P : Pink V : Violet
COMBINATION
METER
SENSOR CIRCUIT
METER AND A/C-ECU
A/C Pressure Circuit
COMMENTS ON TROUBLE SYMPTOM
If the A/C pressure sensor is defective, the damaged
wiring harness between the A/C pressure sensor and
the combination meter (meter and A/C-ECU) may be
suspected.
POSSIBLE CAUSES
• Malfunction of A/C pressure sensor
• Malfunction of the combination meter (meter and
A/C-ECU)
• Damaged harness wires and connectors
DIAGNOSIS PROCEDURE
Step 1. M.U.T.-III data list
Check that the following service data display con-
tents are normal. (Refer to
.)
• Item 04: Pressure sensor
Q: Is the check result normal?
YES :
Go to Step 6.
NO :
Go to Step 2.
Step 2. Connector check: A-02 A/C pressure
sensor connector
AC313797
Connector: A-02
Harness side
AF
A-02 (B)
Q: Is the check result normal?
YES :
Go to Step 3.
NO :
Repair the connector.
Step 3. Inspection of A/C pressure sensor
Refer to
.
Q: Is the check result normal?
YES :
Go to Step 4.
NO :
Replace the A/C pressure sensor.
Main
Index
Group
TOC
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55A-42
Step 4. Connector check: B-14 and B-15
combination meter connector
AC401056
AI
Connectors: B-14, B-15
Harness side
B-15 (B)
B-15
B-14 (B)
Harness side
B-14
Q: Is the check result normal?
YES :
Go to Step 5.
NO :
Repair the connector.
Step 5. Check the wiring harness between B-14,
B-15 combination meter connector (terminals 8,
34 and 30) and A-02 A/C pressure sensor
connector (terminals 2, 1 and 3).
AC313797
Connector: A-02
Harness side
AF
A-02 (B)
AC401056
AI
Connectors: B-14, B-15
Harness side
B-15 (B)
B-15
B-14 (B)
Harness side
B-14
Main
Index
Group
TOC
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55A-43
NOTE:
AC401053
AD
Connector: B-41
Prior to the wiring harness inspection, check interme-
diate connector B-41, and repair if necessary.
• Check the input line for open circuit.
Q: Is the check result normal?
YES :
Go to Step 6.
NO :
Repair the wiring harness.
Step 6. Recheck the trouble symptom
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 :
Replace the combination meter (meter and
A/C-ECU).
Main
Index
Group
TOC
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