2004 MITSUBISHI ENDEAVOR diagnosis

Fig. 87: Identifying Connector C
-123

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

DTC SET CONDITION
If the air mixing damper control motor does not work normally, DTC B1065
will be set.
TECHNICAL DESCRIPTION (COMMENT)
CURRENT TROUBLE
The A/C-ECU, the mode selection damper control motor and potentiometer, or
connector(s) or wiring between them may be defective.
PAST TROUBLE
If DTC B1065 is stored as a past trouble, carry out diagnosis with particular emphasis on wirin
g and connecto
r(s)
betwee
n the A/C-ECU
and the m
ode


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

selection damper control motor and potentiometer. 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 mode selection damper control motor and potentiometer. Malfunction of the A/C-ECU.
DIAGNOSIS REQUIRED SPECIAL TOOLS:

MB991223: 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. 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 connec
tor.

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

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

YES:
The procedure is complete.
NO:
Return to Step 1 .
DTC U1073: BUS OFF TROUBLE JUDGMENT DTC U1073 will be stored when the A/C-ECU ceases CAN communication (bus
off) and then resumes the communication when the ignition switch is turned to the
"LOCK" (OFF) position. TECHNICAL DESCRIPTION (COMMENT) The wiring harness wire or connectors may have loose, corroded, or damage
terminals, or terminals pushed back in the connector, or the A/C-ECU may be
defective. TROUBLESHOOTING HINTS
Defective connector(s) or wiring harness Malfunction of the A/C-ECU
DIAGNOSIS REQUIRED SPECIAL TOOLS:

MB991223: Harness Set
CAUTION: If DTC U1073 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.

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

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

YES:
There is an intermittent malfunction such as poor engaged connector
(s) or open circuit (Refer to
HOW TO USE TROUBLESHOOTING/
INSPECTION SERVICE POINTS
).
NO:
Replace the A/C-ECU. On completion, check that the DTC is not
reset.
DTC U1100: POWERTRAIN CONTROL MODULE TIME-OUT (RELATED TO ENGINE) TROUBLE JUDGMENT The A/C-ECU receives engine control system-related signal from the powertrain
control module. If the ECU cannot receive the signal, DTC U1100 will be set. TECHNICAL DESCRIPTION (COMMENT)
CURRENT TROUBLE
Connector(s) or wiring harness in the CAN bus lines between the powertrain
control module and the A/C-ECU, the power supply system to the powertrain
control module, the powertrain control module itself, or the A/C-ECU may be
defective.
PAST TROUBLE
If DTC U1100 is stored as a past trouble, carry out diagnosis with particular
emphasis on wiring and connector(s) in the CAN bus line between the A/C-
ECU
and the powe
rtrain
control m
odu
le, and the powe
r supp
ly syste
m to the
CAUTION: If DTC U1100 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.

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

powertrain control module. 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 HINTS
Powertrain control module failed 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: Vehicle Communication Interface (V.C.I.) MB991827: MUT-III USB Cable MB991910: MUT-III Main Harness A (Vehicles with CAN
communication system)
1.
STEP 1. Using scan tool MB991958, diagnose the CAN bus line.

NOTE: For a past trouble, you cannot find it by the scan tool CAN
bus diagnostics even if there is a failure in CAN bus lines.
In this case, refer to HOW TO USE TROUBLESHOOTING/
INSPECTION SERVICE POINTS
) and 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

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

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