sensor MITSUBISHI ENDEAVOR 2004 Service Repair Manual

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

Required Special Tools:

MB991658: Test Harness
1. Assemble a gauge manifold on the high pressure service valve.
2. Disconnect the A/C pressure sensor connector and connect special tool
MB991658 as shown in the illustration.
3. Turn ON the engine and then turn ON the air conditioner switch. Fig. 271: Identifying A/C Pressure Sensor Connector

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

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

Fig. 272: Connecting Special Tool (MB991658)

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

4. At this time, check to see that the voltage of A/C pressure sensor terminal No.2
reflects the specifications of the figure.
NOTE: The allowance shall be defined as +/-5%.

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

Fig. 273: Voltage Of A/C Pressure Sensor

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

COMPRESSOR DRIVE BELT ADJUSTMENT Refer to
7. DRIVE BELTS (FOR GENERATOR, POWER STEERING OIL
PUMP AND AIR CONDITIONING
.
CHARGING Use the refrigerant recovery station to charge the refrigerant. METHOD BY USING REFRIGERANT RECOVERY AND RECYCLING UNIT Using the refrigerant recovery and recycling unit, refill the refrigerant. NOTE: Refer to the REFRIGERANT RECOVERY AND RECYCLING
UNIT'S INSTRUCTION MANUAL FOR OPERATION OF THE

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

Fig. 286: Exploded View Of Heater Uni
t
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

INSPECTION AIR THERMO SENSOR INSPECTION Measure the resistance between connector terminals 1 and 2 under at least two
different temperatures. The resistance values should generally match those in the
graph. Fig. 287: Air Thermo Sensor Resistance

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

MOTORS AND TRANSISTORNOTE: The temperature at the check should not exceed the range
in the graph.
2004 Mitsubishi Endeavor LS
2004 HVAC Heater Air Conditioning, Ventilation - Endeavor

Fig. 292: Checking Blower Fan Motor

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

AMBIENT TEMPERATURE SENSOR REMOVAL AND INSTALLATION
2004 Mitsubishi Endeavor LS
2004 HVAC Heater Air Conditioning, Ventilation - Endeavor

Fig. 293: Removing And Installing Ambient Temperature Sensor

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

REMOVAL SERVICE POINT << A >> AMBIENT AIR TEMPERATURE SENSOR REMOVAL To remove the ambient air tem
perature sensor, brea
k off the tab as shown.

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

Fig. 294: Identifying Ambient Air Temperature Sensor Tab

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

INSPECTION AMBIENT AIR TEMPERATURE SENSOR CHECK
CAUTION: The ambient air temperature sensor should be
checked with removing it. If the sensor is removed, it
is no longer serviceable.

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

Measure the resistance between the sensor terminals under at least two
temperatures. The resistance values should meet the values shown. Fig. 295: Temperature Resistance Graph

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

COMPRESSOR ASSEMBLY AND TENSION PULLEY REMOVAL AND INSTALLATION NOTE: The temperature should be within the shown range.
2004 Mitsubishi Endeavor LS
2004 HVAC Heater Air Conditioning, Ventilation - Endeavor

When metering R-134a into the refrigeration system, keep the supply tank or cans
in an upright position. If the refrigerant container is on its side or upside down,
liquid refrigerant will enter the system and damage the compressor.
Refrigerant will tarnish bright metal and chrome surfaces, and in combination with
moisture can severely corrode all metal surfaces. OPERATION CONDENSER FAN AND RADIATOR FAN CONTROL
For the operation of each fan, refer to
SYMPTOM PROCEDURES
.
COMPRESSOR CONTROL WHEN OPERATING THE AIR CONDITIONING SWITCH
The air thermo sensor, which senses the temperature of the air flowing out of
the evaporator, deactivates the compressor at 3°C (37.4°F) or below. The dual pressure switch turns OFF when the refrigerant pressure becomes
excessively high or low, thus protecting the compressor circuit. When the air thermo sensor is activated, and the ignition switch, blower switch,
and air conditioning switch are ON, the A/C compressor clutch relay is
energized.
WHEN OPERATING THE MODE SELECTION DIAL
The air conditioning will work when the mode selection dial is set to the
"Defroster" or "Defroster/foot" position or the temperature control dial is set to
the "MAX A/C" position. In other dial positions, when the air conditioning
switch is turned on, the air conditioning will work.
A/C COMPRESSOR CLUTCH RELAY ON CONDITION
or it will be stained.

2004 Mitsubishi Endeavor LS
2004 HVAC Automatic Air Conditioning - Endeavor