2004 MITSUBISHI ENDEAVOR sensor

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA
.
2. Start the engine.
3. Check the data list.
Item 10: air mix potentiometer.
Check that the set position of the heater control matches the displayed
position on the scan tool.
4. Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the sensor within the specified range?

YES:
Replace the A/C-ECU. Then go to Step 7 .
NO:
Go to Step 4.
STEP 4. Check A/C-ECU connectors C-16, C-17 and air mixing damper
control motor and potentiometer connector C-109 for loose, corroded or
damaged terminals, or terminals pushed back in the connector.

Q: Are A/C-ECU connectors C-16, C-17 and air mixing damper control
motor and potentiometer connector C-109 in good condition?

YES:
Go to Step 5.
NO:
Repair or replace the connector. Refer to
HARNESS
CONNECTOR INSPECTION
. Then
go to Ste
p 7 .

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

Fig. 77: Connecting Scan Tool MB991958 To Data Link Connector

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

2. Start the engine.
3. Check the data list.
Item 12: Air outlet c/o potentiometer.
Check that the set position of the heater control matches the displayed
position on the scan tool.
4. Turn the ignition switch to the "LOCK" (OFF) position
Q: Is the sensor within the specified range?

YES:
Replace the A/C-ECU. Then go to Step 7 .
NO:
Go to Step 4.
STEP 4. Check A/C-ECU connectors C-16, C-17 and mode selection
damper control motor and potentiometer connector C-123 for loose,
corroded or damaged terminals, or terminals pushed back in the
connector.

Q: Are A/C-ECU connectors C-16, C-17 and mode selection damper
control motor and potentiometer connector C-123 in good condition?

YES:
Go to Step 5.
NO:
Repair or replace the connector. Refer to
HARNESS
CONNECTOR INSPECTION
. Then
go to Ste
p 7 .

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

2. Start the engine.
3. Use scan tool MB991958 to run the actuator test.
Item 13: air mix damper motor (FACE position)
Item 14: air mix damper motor (FOOT/FACE position)
Item 15: air mix damper motor (FOOT position)
Item 16: air mix damper motor (DEF/FOOT position)
Item 17: air mix damper motor (DEF position)
Check that the mode selection damper control motor operates.
4. Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the sensor within the specified range?

YES:
Replace the A/C-ECU. Then go to Step 7 .
NO:
Go to Step 4.
STEP 4. Check A/C-ECU connector C-16 and mode selection damper
control motor and potentiometer connector C-123 for loose, corroded or
damaged terminals, or terminals pushed back in the connector.

Q: Are A/C-ECU connector C-16 and mode selection damper control
motor and potentiometer connector C-123 in good condition?

YES:
Go to Step 5.
NO:
Repair or replace the connector. Refer to
HARNESS
CONNECTOR INSPECTION
. Then
go to Ste
p 7 .

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

Fig. 129: View Of A/C Compressor Sensor Circuit

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
2004 Mitsubishi Endeavor LS
2004 HVAC Heater Air Conditioning, Ventilation - Endeavor

relay system may be defective. TROUBLESHOOTING HINTS
Improper amount of refrigerant Malfunction of the air thermo sensor Malfunction of the ambient air temperature sensor Malfunction of the A/C pressure sensor Malfunction of the A/C compressor clutch relay Malfunction of the A/C refrigerant temperature switch Malfunction of the air conditioning compressor clutch Malfunction of the A/C-ECU Malfunction of the PCM Damaged harness wires or connectors
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. Check the defogger and outside/inside air selection damper
control motor operation.

Q: Do the defogger and outside/inside air selection damper control motor
work normally?

YES:
Go to Step 2.
NO:
Refer to
INSPECTION PROCEDURE 10 MALFUNCTION OF
THE A/C
-ECU POWER SUPPLY SYSTEM
.

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

Fig. 167: Checking Air Conditioning Compressor Clutch Operation

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

STEP 20. Check the air thermo sensor.

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.
Q: Is the air thermo sensor in good condition?

YES:
Go to Step 21.
NO:
Replace the air thermo sensor. Check that the air conditioning works
normally.
NOTE: 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. 168: Connector Terminal Resistance (1 Of 2)

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

STEP 21. Check the ambient air temperature sensor.

Measure the resistance between the sensor terminals under at least two
temperatures. The resistance values should meet the values shown.
Q: Is the ambient air temperature sensor in good condition?

YES:
Go to Step 22.
NO:
Replace the ambient air temperature sensor. Check that the air
conditioning works normally.
NOTE: The temperature should be within the shown range.

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

Fig. 169: Connector Terminal Resistance (2 Of 2)

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

STEP 22. Check the A/C pressure sensor operation.

1. Assemble a gauge manifold on the high pressure service valve.
2. Disconnect the A/C pressure sensor connector and connect special tool test
harness MB991658 as shown in the illustration.

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