Ac pressure sensor MITSUBISHI ENDEAVOR 2004 Service User Guide

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA
.
STEP 4. Check A/C pressure sensor connector A-28 for loose, corroded or
damaged terminals, or terminals pushed back in the connector.

Q: Is A/C pressure sensor connector A-28 in good condition?

YES:
Go to Step 5.
NO:
Repair or replace the connector. Refer to
HARNESS
CONNECTOR INSPECTION
. Then go to Step 8 .
Fig. 44: Locating Connector A
-28
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

STEP 5. Check the A/C
pressure sensor
.

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

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. 45: Checking A/C Pressure Sensor

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

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

Fig. 46: Connecting Special Tool (MB991658) To Harness Side

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.
Q: Is the A/C pressure sensor in good condition?

YES:
Go to Step 6.
NO:
Replace the A/C pressure sensor. Then go to Step 8 .
NOTE: The allowance shall be defined as +/-5%.

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

Fig. 47: A/C Pressure Sensor Terminal Graph

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

STEP 6. Check A/C-ECU connectors C-16, C-17 for loose, corroded or
damaged terminals, or terminals pushed back in the connector.

Q: Are A/C-ECU connectors C-16, C-17 in good condition?

YES:
Go to Step 7.
NO:
Repair or replace the connector. Refer to
HARNESS
CONNECTOR INSPECTION
. Then
go to Ste
p 8 .

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

STEP 7. Check the wiring harness between A/C-ECU connector C-16
(terminal 12), C-17 (terminals 34 and 26) and A/C pressure sensor
connector A-28 (terminals 3, 1 and 2).

Fig. 49: Locating Connector A
-28
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

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

Fig. 51: Locating Connector C
-31
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

Q: Is the wiring harness between A/C-ECU connector C-16 (terminal 12),
C-17 (terminals 34 and 26) and A/C pressure sensor connector A-28
(terminals 3, 1 and 2) in good condition?

YES:
Replace the A/C-ECU. Then go to Step 8.
NO:
Repair the wiring harness. Then go to Step 8.
STEP 8. Recheck for dia
gnostic trouble code
.
NOTE: Also check intermediate connector C-31 for loose,
corroded, or damaged terminals, or terminals pushed
back in the connector. If intermediate connector C-31 is
damaged, repair or replace the connector as described
in HARNESS CONNECTOR INSPECTION
.

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. 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

Fig. 170: Identifying A/C Pressure Sensor Connector

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

3. Turn ON the engine and then turn ON the air conditioner switch.
4. At this time, check to see that the voltage of A/C pressure sensor terminal
No.2 reflects the specifications of the figure.

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

Fig. 171: Checking Voltage Of A/C Pressure Sensor

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

Q: Is the A/C pressure sensor operating properly?

YES:
Go to Step 23.
NO:
Replace the A/C pressure sensor. Check that the air conditioning
works normally.
NOTE: The allowance shall be defined as +/-5%

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