Page 2057 of 3870
Fig. 42: Connecting Scan Tool MB991958 To Data Link Connector
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
2004 Mitsubishi Endeavor LS
2004 HVAC Heater Air Conditioning, Ventilation - Endeavor
Page 2058 of 3870

STEP 2. Recheck for diagnostic trouble code.
Recheck if the DTC is set.
1. Erase the DTC.
2. Turn the ignition switch to "ON" position.
3. Check if the DTC is set.
Q: Is the check result satisfactory?
YES:
It can be assumed that this malfunction is intermittent. Refer to
HOW TO USE TROUBLESHOOTING/ INSPECTION SERVICE POINTS
.
NO:
Go to Step 3.
STEP 3. Using scan tool MB991958, check data list item 04: A/C pressure
sensor.
1. Connect scan tool MB991958 to the data link connector.
2. Assemble a manifold gauge onto the high pressure service valve.
3. Turn ON the engine and then turn ON the air conditioner switch.
4. Check the data list.
Item 04: A/C pressure sensor. Check that the refrigerant pressure matches the displayed value on the
scan tool.
5. Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the sensor within the specified range?
CAUTION: To prevent damage to scan tool MB991958,
always turn the ignition switch to the
"LOCK" (OFF) position before connecting or
disconnecting scan tool MB991958.
2004 Mitsubishi Endeavor LS
2004 HVAC Heater Air Conditioning, Ventilation - Endeavor
Page 2059 of 3870
YES:
Replace the A/C-ECU. Then go to Step 8 .
NO:
Go to Step 4.
2004 Mitsubishi Endeavor LS
2004 HVAC Heater Air Conditioning, Ventilation - Endeavor
Page 2060 of 3870
Fig. 43: Connectin
g Scan Tool MB991958 To Data Link Connector
2004 Mitsubishi Endeavor LS
2004 HVAC Heater Air Conditioning, Ventilation - Endeavor
Page 2061 of 3870
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
Page 2062 of 3870
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
Page 2063 of 3870
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
Page 2064 of 3870
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