2004 MITSUBISHI ENDEAVOR air conditioning

4.
STEP 4. Recheck for diagnostic trouble code.

Check again if the DTC is set.
1. Turn the ignition switch to the "ON" position.
2. Check if the DTC is set.
3. Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the check result satisfactory?

YES:
A poor connection, open circuit or other intermittent malfunction is
present in the lines between the powertrain control module and the A/C-
ECU (Refer to
HARNESS CONNECTOR INSPECTION
).
NO:
Replace the powertrain control module. On completion, check that
the DTC is not reset.

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

Fig. 102: Connecting Scan Tool MB991958 To Data Link Connector

Courtes
y of MITSUBISHI MOTOR SALES OF AMERICA
.

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

5.
STEP 5. Recheck for diagnostic trouble code.

Check again if the DTC is set.
1. Turn the ignition switch to the "ON" position.
2. Check if the DTC is set.
3. Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the check result satisfactory?

YES:
A poor connection, open circuit or other intermittent malfunction is
present in the lines between the powertrain control module and the A/C-
ECU (Refer to
HARNESS CONNECTOR INSPECTION
).

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

Fig. 103: Connecting Scan Tool MB991958 To Data Link Connector

Courtes
y of MITSUBISHI MOTOR SALES OF AMERICA
.

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

NO:
Replace the A/C-ECU. On completion, check that the DTC is not
reset.
DTC U1111: MULTI-CENTER DISPLAY UNIT (MIDDLE GRADE TYPE) TIME-OUT TROUBLE JUDGMENT The A/C-ECU receives signals from the multi-center display unit (middle grade
type). If the ECU cannot receive the signal related to the multi-center display unit,
DTC U1111 will be set. TECHNICAL DESCRIPTION (COMMENT)
CURRENT TROUBLE
Connector(s) or wiring harness in the CAN bus lines between the A/C-ECU
and the middle-grade multi-center display unit, the power supply system to the
display unit, the display unit itself, or the A/C-ECU may be defective.
PAST TROUBLE
When DTC U1111 is set as a past trouble, carry out diagnosis with particular
emphasis on connector(s) or wiring harness in the CAN bus lines between the
A/C-ECU and the middle-grade multi-center display unit, the power supply
system to the display unit. If the connectors and wiring are normal, and
obviously the ECU or the middle-grade multi-center display is the cause of the
trouble, replace the ECU or the middle-grade multi-center display. If in doubt,
do not replace the ECU or the display unit.
CAUTION: If DTC U1111 is set in the A/C-ECU, diagnose the
CAN main bus line.
CAUTION: Whenever the ECU is replaced, ensure that the
communication circuit is normal.
NOTE: For a past trouble, you cannot find it by the scan tool CAN
bus diagnostics even if there is a failure in the CAN bus
lines. In this case, refer to HOW TO USE
TROUBLESHOOTING/ INSPECTION SERVICE POINTS
). and

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

TROUBLESHOOTING HINTS
Malfunction of middle-grade multi-center display unit Malfunction of the A/C-ECU Damaged harness wires and connectors
DIAGNOSIS REQUIRED SPECIAL TOOLS:

MB991223: Harness Set MB991958: Scan Tool (MUT-III Sub Assembly)
MB991824: V.C.I. MB991827: USB Cable MB991910: Main Harness A
STEP 1. Using scan tool MB991958, diagnose the CAN bus line.

1. Connect scan tool MB991958 to the data link connec
tor.
check the CAN bus lines. You can narrow down the
possible cause of the trouble by referring to the DTC, which
is set regarding the CAN communication-linked ECUs
(Refer to EXPLANATION ABOUT THE MUT
-III CAN BUS
DIAGNOSIS
).
CAUTION: To prevent damage to scan tool (MUT-III), always
turn the ignition switch to the "LOCK" (OFF)
position before connecting or disconnecting
scan tool (MUT-III).

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

Fig. 104: Connecting Scan Tool MB991958 To Data Link Connector

Courtes
y of MITSUBISHI MOTOR SALES OF AMERICA
.

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

2. Turn the ignition switch to the "ON" position.
3. Diagnose the CAN bus line.
4. Turn the ignition switch to the "LOCK" (OFF) position. Q: Is the CAN bus line found to be normal?

YES:
Go to Step 2.
NO:
Repair the CAN bus line (Refer to
EXPLANATION ABOUT THE
MUT
-III CAN BUS DIAGNOSIS
, DIAGNOSIS < VEHICLES
WITHOUT ADVANCED AIR BAG
or
DIAGNOSIS WITH ADVANCED AIR BAG>
).
STEP 2. Using scan tool MB991958, read the middle-grade multi-center
display diagnostic trouble code.

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