Mitsubishi Lancer (4A9 engine). Manual — part 292
ACA00894
Connector: C-60, C-150 <LHD>
AB
C-60 (B)
C-150 (GR)
AC612709
AU
Connector: C-317 <LHD>
ETACS-ECU
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55A-49
COMMENTS ON TROUBLE SYMPTOM
If the heater control unit is not energised, the power
supply or earth system to the ECU may be defective.
PROBABLE CAUSES
• Malfunction of the heater control unit
• Damaged wiring harness or connectors
DIAGNOSTIC PROCEDURE
STEP 1. M.U.T.-III other system's diagnosis code
Check that the ETACS-ECU has not set a diagnosis
code.
Q: Is the diagnosis code set?
YES :
Carry out the diagnosis code procedures .
Refer to GROUP 54A, ETACS-ECU .
NO :
Go to Step 2.
STEP 2. Connector check: C-60 heater control
unit connector
Q: Is the check result normal?
YES :
Go to Step 3.
NO :
Repair the connector concerned.
STEP 3. Measure the voltage at the C-60 heater
control unit connector.
(1) Disconnect the connector, and measure at the
wiring harness side.
(2) Ignition switch: ON
(3) Voltage between terminal No. 15 and body earth
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 6.
NO :
Go to Step 4.
STEP 4. Connector check: C-317 ETACS-ECU
connector
Q: Is the check result normal?
YES :
Go to Step 5.
NO :
Repair the connector concerned.
STEP 5. Check the wiring harness between C-60
heater control unit connector terminal No. 15 and
C-317 ETACS-ECU connector terminal No. 5.
• Check the power supply line for open circuit.
NOTE: Prior to the wiring harness inspection, check
joint connector C-150, and repair if necessary.
Q: Is the check result normal?
YES :
Intermittent malfunction (Refer to GROUP
00
− How to Use Troubleshooting/
Inspection Service Points - How to Cope
with Intermittent Malfunction ).
NO :
Repair the wiring harness.
STEP 6. Measure the voltage at the C-60 heater
control unit connector.
(1) Disconnect the connector, and measure at the
wiring harness side.
(2) Voltage between terminal No. 13 and body earth
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 8.
NO :
Go to Step 7.
STEP 7. Check the wiring harness between C-60
heater control unit connector terminal No. 13 and
C-317 ETACS-ECU connector terminal No. 10.
• Check the power supply line for open circuit.
Q: Is the check result normal?
YES :
Intermittent malfunction (Refer to GROUP
00
− How to Use Troubleshooting/
Inspection Service Points - How to Cope
with Intermittent Malfunction ).
NO :
Repair the wiring harness.
STEP 8. Measure the resistance at the C-60
heater control unit connector.
(1) Disconnect the connector, and measure at the
wiring harness side.
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55A-50
(2) Resistance between terminal No. 14 and body
earth
OK: Continuity exists (2
Ω or less)
Q: Is the check result normal?
YES :
Replace the heater control unit.
NO :
Go to Step 9.
STEP 9. Check the wiring harness between C-60
heater control unit connector terminal No. 14 and
body earth.
• Check the earth wires for open circuit.
Q: Is the check result normal?
YES :
Intermittent malfunction (Refer to GROUP
00
− How to Use Troubleshooting/
Inspection Service Points - How to Cope
with Intermittent Malfunction ).
NO :
Repair the wiring harness.
TROUBLE SYMPTOM CHART <VEHICLES
WITH A/C>
M1554005002629
Trouble symptom
Inspection
procedure No.
Reference
page
Communication with the M.U.T.-III is not possible
1
Cool air does not come
2
The blower does not work
3
The blower air volume cannot be changed
4
The inside/outside air changeover is impossible
5
The A/C compressor does not work <Petrol engine>
6
The A/C compressor does not work <Diesel engine>
7
The A/C indicator flashes
8
A/C outlet air temperature cannot be set
9
Air outlets changeover is impossible
10
A/C pressure sensor system
11
Blower motor power supply system
12
A/C-ECU power supply system
13
The PTC heater does not work <Vehicles with PTC heater>
14
The buzzer does not sound
15
(Refer to
GROUP 54A
−
Combination
Meter ).
SYMPTOM PROCEDURES
INSPECTION PROCEDURE 1: Communication with the M.U.T.-III is not possible.
COMMENTS ON TROUBLE SYMPTOM
If communication with all other systems is not possi-
ble, there is a high possibility that there is a malfunc-
tion of the diagnosis line. If only the A/C system can
not communicate with the M.U.T.-III, the A/C-ECU
may be defective.
PROBABLE CAUSE
Malfunction of the A/C-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics
Use the M.U.T.-III to diagnose the CAN bus lines.
Q: Is the check result normal?
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55A-51
YES :
Check and repair the power supply circuit
system.
NO :
Repair the CAN bus line (Refer to GROUP
54C, Troubleshooting ).
INSPECTION PROCEDURE 2: Cool air does not come
CIRCUIT OPERATION
If the blower air temperature can not be cool when
turning A/C switch ON and lowering the preset tem-
perature, inadequate refrigerant quantity, sensors,
harness or connectors may be suspected.
PROBABLE CAUSE
Damaged wiring harness or connectors
DIAGNOSIS PROCEDURE
STEP 1. Check the blower operation
Check that air blows through the air outlets.
(1) Turn the ignition switch to the ON position.
(2) Blower knob: Other than OFF
(3) Check that the air comes out of the blower.
Q: Is the check result normal?
YES :
Go to Step 2.
NO :
Refer to Inspection Procedure 3 "The
blower does not work ".
STEP 2. Check the A/C compressor operation
Check that the compressor operates under the fol-
lowing conditions.
• Engine operation
• Air conditioner switch: ON
• Blower knob: Maximum air volume
• Temperature control dial: 18°C (MAX COOL)
NOTE: The compressor does not work when the
blower intake temperature is 0
°
C or less.
Q: Is the check result normal?
YES :
Go to Step 3.
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>
".
STEP 3. M.U.T.-III CAN bus diagnostics
Use the M.U.T.-III to diagnose the CAN bus lines.
Q: Is the check result normal?
YES :
Go to Step 4.
NO :
Repair the CAN bus lines. (Refer to GROUP
54C
− Troubleshooting ).
STEP 4. 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 5.
STEP 5. Refrigerant level check
Check that the refrigerant level is adequate. Refer to
.
Q: Is the check result normal?
YES :
Intermittent malfunction (Refer to GROUP
00, How to Cope with Intermittent
Malfunction ).
NO :
Charge or remove the refrigerant level.
Refer to .
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55A-52
INSPECTION PROCEDURE 3: The blower does not work
Blower Motor Circuit
FUSIBLE
LINK
37
BLOWER
RELAY
ETACS-
ECU
A/C-ECU
BLOWER
MOTOR
POWER
TRANSISTOR
NOTE
: LHD
: RHD
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
FUSIBLE
LINK
42
<4N1>
<4A9, 4J1, 4B1>
ACB02688
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