2004 MITSUBISHI ENDEAVOR service

Disassembling STEP 8. Retest the system.

Q: Does a malfunction take place again?

YES:
Replace the A/C-ECU, and check that the outside/inside air
selection damper control motor works normally.
NO:
It can be assumed that this malfunction is intermittent. Refer to
HOW TO USE TROUBLESHOOTING/ INSPECTION SERVICE POINTS
.
INSPECTION PROCEDURE 4: WHEN THE A/C IS OPERATING, TEMPERATURE INSIDE THE PASSENGER
COMPARTMENT DOES NOT DECREASE (COOL AIR IS NOT EMITTED).
2004 Mitsubishi Endeavor LS
2004 HVAC Heater Air Conditioning, Ventilation - Endeavor

HOW TO USE TROUBLESHOOTING/ INSPECTION SERVICE POINTS
.
NO:
Repair the wiring harness. Check that the air conditioning works
normally.
Fig. 144: Locating Connector A
-13
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

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

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

Refer to
HOW TO USE TROUBLESHOOTING/ INSPECTION
SERVICE POINTS
.
NO:
Repair the wiring harness. Check that the air conditioning works
normally.
Fig. 162: Locating Connector A
-13
Courtes
y of MITSUBISHI MOTOR SALES OF AMERICA
.

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

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

Refer to
HOW TO USE TROUBLESHOOTING/ INSPECTION
SERVICE POINTS
.
NO:
Repair the wiring harness. Check that the air conditioning works
normally.
Fig. 249: Locating Connector C
-103

Courtes
y of MITSUBISHI MOTOR SALES OF AMERICA
.

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