Mitsubishi Lancer (4A9 engine). Manual — part 296
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55A-65
STEP 7. Check the refrigerant level.
Refer to .
Q: Is the refrigerant level correct?
YES :
Go to Step 8.
NO :
Correct the refrigerant level (Refer to On-
vehicle Service ).
STEP 8. Replace the A/C-ECU, and then recheck
the trouble symptom
Check that the compressor works normally.
Q: Is the check result normal?
YES :
This diagnosis is complete.
NO :
Replace the engine-ECU, and then register
the ID code (Refer to GROUP 42B
Troubleshooting
− ID code registration
judgement table <Vehicles with KOS> or
GROUP 42C Troubleshooting
− ID code
registration judgement table <Vehicles
without KOS>).
STEP 9. Connector check: A-14X A/C
compressor relay connector
Q: Is the check result normal?
YES :
Go to Step 10.
NO :
Repair the connector.
STEP 10. Check the A/C compressor relay
Refer to .
Q: Is the check result normal?
YES :
Go to Step 11.
NO :
Replace the A/C compressor relay.
STEP 11. Voltage measurement at A-14X A/C
compressor relay connector.
(1) Remove the relay, and measure at the relay block
side.
(2) Voltage between terminal 2, 4 and body earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 13.
NO :
Go to Step 12.
STEP 12. Check the wiring harness between A-
14X A/C compressor relay connector terminal
No.2, 4 and the fusible link (38).
• Check the A/C compressor relay power supply
line for open 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.
STEP 13. Check the wiring harness between A-
14X A/C compressor relay connector terminal
No.3 and B-113 A/C compressor assembly
connector terminal No.1.
• Check the A/C compressor power supply line for
open circuit.
NOTE: Prior to the wiring harness inspection, check
intermediate connectors A-60, and repair if neces-
sary.
Q: Is the check result normal?
YES :
Go to Step 14.
NO :
Repair the wiring harness.
STEP 14. Check the wiring harness between A-
14X A/C compressor relay connector terminal
No.1 and B-39 engine-ECU connector terminal
No.19.
• Check the A/C compressor relay power supply
line for open circuit.
NOTE: Prior to the wiring harness inspection, check
intermediate connectors A-11, and repair if neces-
sary.
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.
INSPECTION PROCEDURE 8: The A/C indicator flashes
COMMENTS ON TROUBLE SYMPTOM
If the A/C indicator flashes, diagnosis code B1079
will be set (Refer to ).
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55A-66
INSPECTION PROCEDURE 9: A/C outlet air temperature cannot be set
Air Mixing Damper Control Motor Circuit
A/C-ECU
AIR MIXING
DAMPER
CONTROL MOTOR
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 SI : Silver
AC612706
Connectors: C-13, C-117 <LHD>
AI
C-13 (B)
C-117
AC612710
Connectors: C-13, C-117 <RHD>
AW
C-13 (B)
C-117
COMMENTS ON TROUBLE SYMPTOM
If the air conditioner outlet temperature cannot be
adjusted, the air mixing damper control motor or the
A/C-ECU may be faulty.
NOTE: It cannot be adjusted while the engine cool-
ant temperature is low.
PROBABLE CAUSES
• Malfunction of the air mix damper control motor
• Malfunction of the A/C-ECU
DIAGNOSTIC PROCEDURE
STEP 1. Check the compressor operation
Check that the compressor operates under the fol-
lowing conditions.
• Engine operation
• Air volume control dial: Maximum
• Air conditioner switch: ON
• Temperature control dial: MAX COOL
Q: Is the check result normal?
YES :
Go to Step 2.
NO :
Refer to INSPECTION PROCEDURE 6:
"The A/C compressor does not work
<Petrol engine>", INSPECTION
PROCEDURE 7: "The A/C compressor
does not work <Diesel engine>".
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55A-67
STEP 2. M.U.T.-III diagnosis code
Check that the diagnosis code related to the air con-
ditioner is not set.
Q: Is the diagnosis code set?
YES :
Carry out the diagnosis code procedures.
Refer to .
NO :
Go to Step 3.
STEP 3. M.U.T.-III actuator test
Carry out the actuator test. (Refer to ).
• Item 06: air mixing damper control motor (Select
"position reset").
Q: Is the check result normal?
YES :
This diagnosis is complete.
NO :
Go to Step 4.
STEP 4. Connector check: C-117 air mixing
damper control motor connector, C-13 A/C-ECU
connector
Q: Is the check result normal?
YES :
Go to Step 5.
NO :
Repair the connector concerned.
STEP 5. Check the wiring harness wires between
C-117 air mixing damper control motor connector
(terminals 3, 2, 5, 4 and 1) and C-13 A/C-ECU
connector (terminals 29, 35, 36, 34 and 28).
• 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. Replace the air mixing damper control
motor, and recheck the trouble symptom.
Check that A/C outlet air temperature can be
adjusted.
NOTE: Whenever the motor is replaced, initialise the
motor position by using the Actuator Test.
Q: Is the check result normal?
YES :
This diagnosis is complete.
NO :
Replace the A/C-ECU.
INSPECTION PROCEDURE 10: Air outlets changeover is impossible.
A/C-ECU
Mode Selection Damper Control Motor Circuit
MODE SELECTION
DAMPER CONTROL
MOTOR
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 SI : Silver
AC612706
Connectors: C-13, C-108 <LHD>
AJ
C-13 (B)
C-108
AC612710
Connectors: C-13, C-108 <RHD>
AX
C-13 (B)
C-108
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55A-68
COMMENTS ON TROUBLE SYMPTOM
If the air conditioner outlets changeover is impossi-
ble, the mode selection damper control motor or the
A/C-ECU may be faulty.
PROBABLE CAUSES
• Malfunction of the mode selection damper control
motor
• Malfunction of the A/C-ECU
DIAGNOSTIC PROCEDURE
STEP 1. M.U.T.-III diagnosis code
Check that the diagnosis code related to the air con-
ditioner is not set.
Q: Is the diagnosis code set?
YES :
Carry out the diagnosis code procedures.
Refer to .
NO :
Go to Step 2.
STEP 2. M.U.T.-III actuator test
Carry out the actuator test. (Refer to ).
• Item 08: Air outlet c/o damper: (Select "position
reset".)
Q: Is the check result normal?
YES :
This diagnosis is complete.
NO :
Go to Step 3.
STEP 3. Connector check: C-108 mode selection
damper control motor connector and C-13 A/C-
ECU connector
Q: Is the check result normal?
YES :
Go to Step 4.
NO :
Repair the connector concerned.
STEP 4. Check the wiring harness wires between
C-108 mode selection damper control motor
connector (terminals 1, 4, 5, 2 and 3) and C-13 A/
C-ECU connector (terminals 33, 30, 32, 31 and
29).
• Check the input line for open circuit.
Q: Is the check result normal?
YES :
Go to Step 5.
NO :
Repair the wiring harness.
STEP 5. Replace the mode selection damper
control motor, and recheck the trouble symptom.
Check that the air outlets can be changed.
NOTE: Whenever the motor is replaced, initialise the
motor position by using the Actuator Test.
Q: Is the check result normal?
YES :
This diagnosis is complete.
NO :
Replace the A/C-ECU.
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст