MITSUBISHI ENDEAVOR 2004 Service Repair Manual

Fig. 241: View Of A/C
-ECU Power Supply Circuit

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

Fig. 242: Identifying Connectors C
-04, C
-31, C
-103 And C
-104

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

Fig. 243: Identifying Connectors C
-16 And C
-17
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
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

terminals, or terminals pushed back in the connector
.
Q: Is A/C-ECU connector C-17 in good condition?

YES:
Go to Step 2.
NO:
Repair or replace the connector. Refer to
HARNESS
CONNECTOR INSPECTION
. Check that the air conditioning works
normally.
Fig. 245: Locating Connector C
-17
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

STEP 2. Measure the voltage at A/C-ECU connector C-17.

1. Disconnect A/C-ECU connector C-17 and measure the voltage at the
harness side.
2. Turn the i
gnition switch to the "ON"
position.

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

Fig. 246: Locating Connector C
-17
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

3. Measure the voltage between terminal 28 and ground.
The measured value should be approximately 12 volts (battery positive volta
ge).

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

Fig. 247: Measuring Voltage Between Terminal 28 And Ground

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

Q: Is the measured voltage approx. 12 V?

YES:
Go to Step 4 .
NO:
Go to Step 3.
STEP 3. Check the wiring harness between A/C-ECU connector C-17
(terminal 28) and the i
gnition switch (IG2)
.

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

Fig. 248: Locating Connector C
-17
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

Q: Is the wiring harness between A/C-ECU connector C-17 (terminal 28)
and the ignition switch (IG2) in good condition?

YES:
It can be assumed that this malfunction is intermittent.
NOTE: Also check joint connector C-103, junction block
connectors C-211 and C-215 for loose, corroded, or
damaged terminals, or terminals pushed back in the
connector. If joint connector C-103, junction block
connector C-211 or C-215 is damaged, repair or replace
the connector as described in HARNESS CONNECTOR
INSPECTION
.

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

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