2004 MITSUBISHI ENDEAVOR wiring

DTC U1120: FAILURE INFORMATION ON POWERTRAIN CONTROL MODULE (RELATED TO ENGINE)TROUBLE JUDGMENT The A/C-ECU receives engine control system-related signal from the powertrain
control module by the CAN bus lines. If a fail-safe related data is contained in the
signal from the powertrain control module, DTC U1120 will be stored. TECHNICAL DESCRIPTION (COMMENT)
CURRENT TROUBLE
The wiring harness wire or connectors may have loose, corroded, or damage
terminals, or terminals pushed back in the connector, the powertrain control
module, or the A/C-ECU may be defective.
PAST TROUBLE
If DTC U1120 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 powertrain control module, and the power supply system to the
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.
CAUTION: If DTC U1120 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.
CAUTION: The engine control system- related DTC may be set
when DTC U1120 is set (For details refer to
INTERSYSTEM AFFILIATED DTC REFERENCE
TABLE
). Diagnose the engine control system first
when the engine control system- related DTC is set.
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.

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

Fig. 121: Measuring Voltage Between Terminal 1 And Ground

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

STEP 4. Check the wiring harness between outside/inside air selection
damper control motor connector C-106 (terminal 1) and the ignition
switch (IG2).


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

Fig. 122: Locating Connector C
-106

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

Q: Is the wiring harness between outside/inside air selection damper
control motor connector C-106 (terminal 1) and the ignition switch (IG2)
in good condition?

YES:
It can be assumed that this malfunction is intermittent. Refer to
NOTE: Also check joint connector C-103, junction block
connectors C-211 and C-215 for loose, corroded, or
damaged terminals, or terminals pushed back in the
connector. If intermediate connector C-103, junction
block connector C-211 or C-215 is damaged, repair or
replace the connector as described in HARNESS
CONNECTOR INSPECTION
.

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

HOW TO USE TROUBLESHOOTING/ INSPECTION SERVICE POINTS
.
NO:
Repair the wiring harness. Check that the outside/inside air selection
damper control motor works normally.
Fig. 123: Locating Connector C
-103

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

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

NO:
Repair or replace the connector. Refer to
HARNESS
CONNECTOR INSPECTION
. Check that the outside/inside air
selection damper control motor works normally.
Fig. 127: Locating Connector C
-16
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

STEP 7. Check the wiring harness between outside/inside air selection
damper control motor connector C-106 (terminals 4 and 5) and A/C-ECU
C-16 (terminals 5 and 6).

Q: Is the wiring harness between outside/inside air selection damper
control motor connector C-106 (terminals 4 and 5) and A/C-ECU C-16
(terminals 5 and 6) in good condition?

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

YES:
Go to Step 8.
NO:
Repair the wiring harness. Check that the outside/inside air selection
damper control motor works normally.

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

Q: Is the measured voltage approx. 12 volts?

YES:
Go to Step 11 .
NO:
Go to Step 10.
Fig. 142: Measuring Voltage Between Terminal 2 And Ground

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

STEP 10. Check the wiring harness between A/C compressor clutch relay
connector
B-16X (terminal 2) and the i
gnition switch (IG2)
.

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

Fig. 143: Locating Connector B
-16X

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

Q: Is the wiring harness between A/C compressor clutch relay connector
B-16X (terminal 2) and the ignition switch (IG2) in good condition?

YES:
It can be assumed that this malfunction is intermittent. Refer to
NOTE: Also check intermediate connector A-13, joint
connector C-04, junction block connectors C-214 and C-
215 for loose, corroded, or damaged terminals, or
terminals pushed back in the connector. If intermediate
connector A-13, joint connector C-04, junction block
connector C-214 or C-215 is damaged, repair or replace
the connector as described in HARNESS CONNECTOR
INSPECTION
.

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