2004 MITSUBISHI ENDEAVOR diagnosis

Malfunction of the front blower motor Malfunction of the A/C-ECU Damaged harness wires or connectors
DIAGNOSIS REQUIRED SPECIAL TOOLS:

MB991223: Test Harness Set STEP 1. Check front blower motor connector C-111 and A/C-ECU
connector C-16 for loose, corroded or damaged terminals, or terminals
pushed back in the connector.

Q: Are front blower motor connector C-111 and A/C-ECU connector C-16
in good condition?

YES:
Go to Step 2.
NO:
Repair or replace the connector. Refer to
HARNESS
CONNECTOR INSPECTION
. The front blower motor should operate
normall
y.

2004 Mitsubishi Endeavor LS
2004 HVAC Heater Air Conditioning, Ventilation - Endeavor

Damaged harness wires or connectors
DIAGNOSIS Required Special Tool:

MB991223: Test Harness Set STEP 1. Check power transistor connector C-108 for loose, corroded or
damaged terminals, or terminals pushed back in the connector.

Q: Is power transistor connector C-108 in good condition?

YES:
Go to Step 2.
NO:
Repair or replace the connector. Refer to
HARNESS
CONNECTOR INSPECTION
. The front blower motor should operate
normall
y.

2004 Mitsubishi Endeavor LS
2004 HVAC Heater Air Conditioning, Ventilation - Endeavor

STEP 8. Replace the power transistor.

Q: Does the blower motor operate normally?

YES:
It can be assumed that this malfunction is intermittent. Refer to
HOW TO USE TROUBLESHOOTING/ INSPECTION SERVICE POINTS
.
NO:
Replace the A/C-ECU. Check that the air conditioning works
normally.
INSPECTION PROCEDURE 7: THE A/C INDICATOR FLASHES TECHNICAL DESCRIPTION (COMMENT) If the A/C indicator flashes, inadequate refrigerant quantity, the ambient air
temperature sensor circuit or the A/C pressure sensor circuit is suspected. TROUBLESHOOTING HINTS
Malfunction of the A/C pressure sensor Malfunction of the ambient air temperature sensor Malfunction of the A/C-ECU
DIAGNOSIS Required Special Tools:

MB991223: Test Harness Set MB991958: Scan Tool (MUT-III Sub Assembly)
MB991824: Vehicle Communication Interface (V.C.I.) MB991827: MUT-III USB Cable MB991910: MUT-III Main Harness A (Vehicles with CAN
communication system)
STEP 1. Using scan tool MB991958, read the diagnostic trouble code.

Check if an A/
C-ECU DTC is set.

2004 Mitsubishi Endeavor LS
2004 HVAC Heater Air Conditioning, Ventilation - Endeavor

Fig. 240: Checking Defogger

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

INSPECTION PROCEDURE 9: DEFOGGER TIMER FUNCTION DOES NOT OPERATE CIRCUIT OPERATION Turn ON the defogger switch. If the defogger does not shut off after about 17
minutes then the defogger timer is malfunctioning. TROUBLESHOOTING HINT
Malfunction of the A/C-ECU Malfunction of the defogger timer
DIAGNOSIS Replace the A/C-ECU. INSPECTION PROCEDURE 10: MALFUNCTION OF THE A/C-ECU POWER SUPPLY SYSTEM
2004 Mitsubishi Endeavor LS
2004 HVAC Heater Air Conditioning, Ventilation - Endeavor

Fig. 244: Identifying Connectors C
-211 And C
-215

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

TECHNICAL DESCRIPTION (COMMENT) The A/C-ECU power system may be defective if the air conditioner, defogger, and
outside/inside air selection damper motor all do not operate normally. TROUBLESHOOTING HINTS
Malfunction of the A/C-ECU Damaged harness wires or connectors
DIAGNOSIS Required Special Tools:

MB991223: Test Harness Set STEP 1. Check A/C-ECU connector C-17 for loose, corroded or damaged

2004 Mitsubishi Endeavor LS
2004 HVAC Heater Air Conditioning, Ventilation - Endeavor

Fig. 1: Identifying A/C Compressor Clutch Relay ON Condition

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

AUTO A/C DIAGNOSIS INTRODUCTION After air is taken in through the damper, it is fed to the evaporator by the blower fan
and motor and cooled. The air cooled by the air mix damper is mixed appropriately
with the warmed air to achieve a comfortable temperature. If the A/C does not
operate or the cooled air is not discharged, the system components or relay may be
faulty. AUTOMATIC AIR CONDITIONING TROUBLESHOOTING STRATEGY Use these steps to plan your diagnostic strategy. If you follow them carefully, you
will be sure that you have exhausted most of the possible ways to find a heater, air
conditioning and ventilation fault.
1. Gather information from the customer.
2. Verify that the condition described by the customer exists.
3. Find the malfunction by following
SYMPTOM CHART
.
4. Verify malfunction is eliminated.
DIAGNOSTIC FUNCTION HOW TO CONNECT THE SCAN TOOL (MUT-III)
2004 Mitsubishi Endeavor LS
2004 HVAC Automatic Air Conditioning - Endeavor

6. Turn the power switch of special tool MB991824 to the "ON" position.
7. Start the MUT-III system on the personal computer. HOW TO READ AND ERASE DIAGNOSTIC TROUBLE CODES Required Special Tool:

MB991958: Scan Tool (MUT-III Sub Assembly)
MB991824: Vehicle Communication Interface (V.C.I.) MB991827: MUT-III USB Cable MB991910: MUT-III Main Harness A (Vehicles with CAN
communication system)
1. Connect scan tool MB991958 to the data link connector.
2. Turn the ignition switch to the "ON" position.
3. Select "Interactive Diagnosis" from the start-up screen.
4. Select "S
ystem Select."
NOTE: When the special tool MB991824 is energized, the
special tool MB991824 indicator light will be illuminated
in a green color.
NOTE: Disconnecting the scan tool is the reverse of the
connecting sequence, making sure that the ignition switch
is at the "LOCK" (OFF) position.
CAUTION: To prevent damage to scan tool MB991958, always
turn the ignition switch to the "LOCK" (OFF) position
before connecting or disconnecting scan tool
MB991958.
NOTE: If the battery voltage is low, diagnostic trouble codes will
not be set. Check the battery if scan tool MB991958 does
not display.

2004 Mitsubishi Endeavor LS
2004 HVAC Automatic Air Conditioning - Endeavor

Fig. 3: Connecting Special Tool MB991910 To Data Link Connector

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

HOW TO READ DATA LIST Required Special Tool:

MB991958: Scan Tool (MUT-III Sub Assembly)
MB991824: Vehicle Communication Interface (V.C.I.) MB991827: MUT-III USB Cable MB991910: MUT-III Main Harness A (Vehicles with CAN
communication system)
1. Connect the scan tool MB991958 to the data link connector.
2. Turn the ignition switch to the "ON" position.
3. Select "Interactive Diagnosis" from the start-up screen.
4. Select "System Select."
5. Choose "Air Conditioner" from the "BODY" tab.
6. Select "MITSUBISHI."
7. Select "Data List."
8. Choose an a
ppropriate item and select the "OK" but
ton.
CAUTION: To prevent damage to scan tool MB991958, always
turn the ignition switch to the "LOCK" (OFF) position
before connecting or disconnecting scan tool
MB991958.

2004 Mitsubishi Endeavor LS
2004 HVAC Automatic Air Conditioning - Endeavor