2004 MITSUBISHI ENDEAVOR sensor

Q: Are A/C-ECU connectors C-16, C-17 and ambient air temperature
sensor connector A-22 in good condition?

YES:
Go to Step 5.
NO:
Repair or replace the connector. Refer to
HARNESS
CONNECTOR INSPECTION
. Then go to Step 7 .
STEP 5. Check the wiring harness between A/C-ECU connector C-16
(terminal 20), C-17 (terminal 23) and ambient air temperature sensor
connector A-22 (terminals 1 and 2).

Fig. 19: Locating Connector A
-22
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

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

Fig. 21: Locating Connector C
-24
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

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

YES:
Go to Step 6.
NO:
Re
pair the wirin
g harness. Then
go to Ste
p 7 .
NOTE: Also check intermediate connector C-24 and joint
connector C-104 for loose, corroded, or damaged
terminals, or terminals pushed back in the connector. If
intermediate connector C-24 or 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

Fig. 22: Locating Connector C
-104

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

STEP 6. Check the ambient air temperature sensor.

1. Disconnect ambient air temperature sensor connector A-22.
CAUTION: The ambient air temperature sensor should
be checked without removing it. If the sensor
is removed, it is no longer serviceable.

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

Fig. 23: Locating Connector A
-22
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

2. Measure the resistance between the sensor terminals under at least two
temperatures. The resistance values should meet the values shown.
NOTE: The temperature should be within the shown range.

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

Q: Is the ambient air temperature sensor in good condition?

YES:
Replace the A/C-ECU. Then go to Step 7.
NO:
Replace the ambient air temperature sensor. Then go to Step 7.
STEP 7. Recheck for diagnostic trouble code.

Check again if the DTC is set.
1
.Co
nnect
sca
n too
l MB
991958
to the data
link
connect
or
Fig. 24: Sensor Terminal Resistance Graph

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

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

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA
.
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 B1021, B1022: AIR THERMO SENSOR SYSTEM
2004 Mitsubishi Endeavor LS
2004 HVAC Heater Air Conditioning, Ventilation - Endeavor

Fig. 26: View Of Air Thermo Sensor Circuit

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
2004 Mitsubishi Endeavor LS
2004 HVAC Heater Air Conditioning, Ventilation - Endeavor

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