Mitsubishi Lancer (4A9 engine). Manual — part 298
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55A-73
STEP 6. Retest the system.
Check that the blower motor is energised.
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 :
Replace the ETACS-ECU.
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55A-74
INSPECTION PROCEDURE 13: A/C-ECU power supply system
A/C-ECU Power Source Circuit
IGNITION
SWITCH (IG1)
A/C-ECU
ETACS-
ECU
IG1
RELAY
FUSIBLE
LINK
<4N1>
38
FUSIBLE
LINK
<4A9, 4J1, 4B1>
36
FUSIBLE
LINK
<4N1>
44
FUSIBLE
LINK
<4A9, 4J1, 4B1>
34
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
ENGINE
COMPARTMENT
RELAY BOX
POWER
SOURCE
POWER
SOURCE
NOTE
:LHD
:RHD
ACB02703
ACA00894
Connector: C-15, C-150 <LHD>
AC
C-15 (B)
C-150 (GR)
AC612710
Connector: C-15 <RHD>
AS
C-15 (B)
AC612711
Connector: C-150 <RHD>
DM
C-150 (GR)
AC612709
AU
Connector: C-317 <LHD>
ETACS-ECU
AC612717
Connector: C-317 <RHD>
AU
ETACS-ECU
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55A-75
COMMENTS ON TROUBLE SYMPTOM
If the A/C-ECU is not energised, the power supply or
earth system to the ECU may be defective.
PROBABLE CAUSES
• Malfunction of the A/C-ECU
• 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-15 A/C-ECU
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-15 A/C-ECU
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-15
A/C-ECU 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?
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55A-76
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-15 A/C-ECU
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-15
A/C-ECU 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-15 A/C-
ECU connector.
(1) Disconnect the connector, and measure at the
wiring harness side.
(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 A/C-ECU.
NO :
Go to Step 9.
STEP 9. Check the wiring harness between C-15
A/C-ECU 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.
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