2004 MITSUBISHI ENDEAVOR wiring

Fig. 28: Identifying Connectors C
-104 And C
-122

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

DTC SET CONDITION
DTC B1021 is set if there is a short circuit in the air thermo sensor input
circuit. DTC B1022 is set if there is a defective connector connection, or if there is an
open circuit in the harness.
TECHNICAL DESCRIPTION (COMMENT)
CURRENT TROUBLE
The A/C-ECU, the air thermo sensor, or connector(s) or wiring between the
two may be defective.
PAST TROUBLE
2004 Mitsubishi Endeavor LS
2004 HVAC Heater Air Conditioning, Ventilation - Endeavor

If DTC B1021 or B1022 is stored as a past trouble, carry out diagnosis with
particular emphasis on wiring and connector(s) between the A/C-ECU and the
air thermo 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 air thermo 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)
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 ignition switch to "ON" position.
3. Dia
gnose the CAN bus line.

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

Fig. 32: Locating Connector C
-122

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

STEP 5. Check the wiring harness between A/C-ECU connector C-16
(terminal 20), C-17 (terminal 24) and air thermo sensor connector C-122
(terminals 1 and 2)
.

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

Q: Is the wiring harness between A/C-ECU connector C-16 (terminal 20),
C-17 (terminal 23) and air thermo sensor connector C-122 (terminals 1
and 2) in good condition?

YES:
Go to Step 6.
NO:
Repair the wiring harness. Then go to Step 7 .
STEP 6. Check the air thermo sensor.

1. Disconnect the air thermo sensor connector C-122.
NOTE: Also check joint connector C-104 for loose, corroded,
or damaged terminals, or terminals pushed back in the
connector. If joint connector C-104 is damaged, repair
or replace the connector as described in HARNESS
CONNECTOR INSPECTION
.

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

STEP 7. Check the wiring harness between A/C-ECU connector C-16
(terminal 12), C-17 (terminals 34 and 26) and A/C pressure sensor
connector A-28 (terminals 3, 1 and 2).

Fig. 49: Locating Connector A
-28
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

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

Fig. 51: Locating Connector C
-31
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

Q: Is the wiring harness between A/C-ECU connector C-16 (terminal 12),
C-17 (terminals 34 and 26) and A/C pressure sensor connector A-28
(terminals 3, 1 and 2) in good condition?

YES:
Replace the A/C-ECU. Then go to Step 8.
NO:
Repair the wiring harness. Then go to Step 8.
STEP 8. Recheck for dia
gnostic trouble code
.
NOTE: Also check intermediate connector C-31 for loose,
corroded, or damaged terminals, or terminals pushed
back in the connector. If intermediate connector C-31 is
damaged, repair or replace the connector as described
in HARNESS CONNECTOR INSPECTION
.

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

Fig. 55: Identifying Connectors C
-103 And C
-104

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

DTC SET CONDITION
DTC B1041 or B1042 is set if there is an open or short circuit in the
potentiometer input circuit, or if there is an open circuit in the power circuit or
earth circuit.
TECHNICAL DESCRIPTION (COMMENT)
CURRENT TROUBLE
The A/C-ECU, the air mixing damper control motor and potentiometer, or
connector(s) or wiring between the two may be defective.
PAST TROUBLE
2004 Mitsubishi Endeavor LS
2004 HVAC Heater Air Conditioning, Ventilation - Endeavor