2004 MITSUBISHI ENDEAVOR air conditioning

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

Fig. 39: Identifying Connector A
-28
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

Fig. 40: Identifying Connector C
-31
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
2004 Mitsubishi Endeavor LS
2004 HVAC Heater Air Conditioning, Ventilation - Endeavor

Fig. 41: Identifying Connectors C
-16 And C
-17
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

DTC SET CONDITION
DTC B1031 is set if there is a short circuit in the A/C pressure sensor input
circuit. DTC B1031 or B1032 is set if there is a defective connector connection, or if
there is an open circuit in the harness.
TECHNICAL DESCRIPTION (COMMENT)
2004 Mitsubishi Endeavor LS
2004 HVAC Heater Air Conditioning, Ventilation - Endeavor

CURRENT TROUBLE
The A/C-ECU, the A/C pressure sensor or the connector(s) or wiring between
the two may be defective
PAST TROUBLE
If DTC B1031 or B1032 is stored as a past trouble, carry out diagnosis with
particular emphasis on wiring and connector(s) between the A/C-ECU and the
A/C pressure sensor. If the connectors and wiring are normal, and obviously
the ECU is the cause of the trouble, replace the ECU. If in doubt, do not
replace the ECU.
TROUBLESHOOTING HINT
Malfunction of connector. Malfunction of the harness. Malfunction of the A/C pressure sensor. Malfunction of the A/C-ECU.
DIAGNOSIS REQUIRED SPECIAL TOOL:

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)
MB991658: Test Harness Set STEP 1. Using scan tool MB991958, diagnose the CAN bus line.

Use scan tool MB991958 to diagnose the CAN bus lines.
1. Connect scan tool MB991958 to the data link connector.
2. Turn the i
gnition switch to "ON"
position.

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

3. Diagnose the CAN bus line. Q: Is the check result satisfactory?

YES:
Go to Step 2.
NO:
Repair the CAN bus lines (Refer to
CAN BUS DIAGNOSTICS
TABLE
). Then
go to Ste
p 8 .

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

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

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

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