2004 MITSUBISHI ENDEAVOR air condition compressor

The measured value should be approximately 12 volts (battery
positive voltage).
Q: Is the measured voltage approx. 12 volts?

YES:
Go to Step 13 .
NO:
Go to Step 12.
Fig. 148: Measuring Voltage Between Connector Terminal 1 And Ground

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

STEP 12. Check the wiring harness between A/C compressor clutch relay
connector B-16X
(terminal 1
) and the batter
y.

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

Fig. 149: Locating Connector B
-16X

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

Q: Is the wiring harness between A/C compressor clutch relay connector
B-16X (terminal 1) and the battery in good condition?

YES:
It can be assumed that this malfunction is intermittent.
Refer to
HOW TO USE TROUBLESHOOTING/ INSPECTION
SERVICE POINTS
.
NOTE: Also check intermediate connector A-13 for loose,
corroded, or damaged terminals, or terminals pushed
back in the connector. If intermediate connector A-13 is
damaged, repair or replace the connector as described
in HARNESS CONNECTOR INSPECTION
.

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

NO:
Repair the wiring harness. Check that the air conditioning works
normally.
STEP 13. Check the wiring harness between A/C compressor clutch relay
connector B-16X (terminal 4) and A/C compressor connector B-114
(terminal 1).

Q: Is the wiring harness between A/C compressor clutch relay connector
B-16X (terminal 4) and A/C compressor connector B-114 (terminal 1) in
good condition?

YES:
Go to Step 14.
NO:
Repair the wiring harness. Check that the air conditioning works
normally.
Fig. 150: Locating Connector A
-13
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

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

Fig. 152: Locating Connectors B
-16X And B
-114

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

STEP 14. Check the wiring harness between powertrain control module
connector B-20 (terminal 81) and A/C compressor clutch relay connector
B-16X (terminal 3).

Q: Is the wiring harness between powertrain control module connector B-
20 (terminal 81) and A/C compressor clutch relay connector B-16X
(terminal 3) in good condition?

YES:
It can be assumed that this malfunction is intermittent.
Refer to
HOW TO USE TROUBLESHOOTING/ INSPECTION
SERVICE POINTS
.
NO:
Re
pair the wirin
g harness. Check that the air con
ditionin
g works

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

Fig. 159: Measuring Voltage Between Terminal 10 And Ground

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

STEP 17. Check the wiring harness between A/C compressor clutch relay
connector B-16X (terminal 4) and A/C-ECU connector C-16 (terminal 10).

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

Fig. 161: Locating Connector C
-16
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

Q: Is the wiring harness between A/C compressor clutch relay connector
B-16X (terminal 4) and A/C-ECU connector C-16 (terminal 10) in good
condition?

YES:
It can be assumed that this malfunction is intermittent.
NOTE: Also check intermediate connectors A-13 and C-24 for
loose, corroded, or damaged terminals, or terminals
pushed back in the connector. If intermediate connector
A-13 or C-24 is damaged, repair or replace the
connector as described in HARNESS CONNECTOR
INSPECTION
.

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

Q: Is the refrigerant temperature switch operating properly?

YES:
Go to Step 19.
NO:
Replace the refrigerant temperature switch. Check that the air
conditioning works normally.
STEP 19. Check the air conditioning compressor clutch operation.

Connect the compressor connector terminal to the battery positive (+) terminal
and ground the battery's negative (-) terminal to the compressor unit. At that
time, the air conditioning compressor clutch should make a definite operating
sound.
Q: Can the sound (click) of the air conditioning compressor clutch
operation be heard?

YES:
Go to Step 20.
NO:
Replace the compressor magnet clutch. Check that the air
conditionin
g works normall
y.

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