Page 2129 of 3870
Fig. 90: Locating Connector C
-16
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
2004 Mitsubishi Endeavor LS
2004 HVAC Heater Air Conditioning, Ventilation - Endeavor
Page 2130 of 3870
Fig. 91: Locating Connector C
-123
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
STEP 5. Check the wiring harness between A/C-ECU connector C-16
(terminals 11 and 4) and mode selection damper control motor and
potentiometer connector C-123 (terminals 1 and 2).
Q: Are the wiring harnesses between A/C-ECU connector C-16 (terminals
11 and 4) and mode selection damper control motor and potentiometer
connector C-123 (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 .
2004 Mitsubishi Endeavor LS
2004 HVAC Heater Air Conditioning, Ventilation - Endeavor
Page 2131 of 3870
Fig. 92: Locating Connector C
-16
Courtes
y of MITSUBISHI MOTOR SALES OF AMERICA
.
2004 Mitsubishi Endeavor LS
2004 HVAC Heater Air Conditioning, Ventilation - Endeavor
Page 2132 of 3870
Fig. 93: Locating Connector C
-123
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
STEP 6. Check the mode selection damper control motor.
CAUTION: Do not apply battery voltage when the damper is
in the FACE or DEF position.
2004 Mitsubishi Endeavor LS
2004 HVAC Heater Air Conditioning, Ventilation - Endeavor
Page 2133 of 3870
Fig. 94: Identifying Damper Control Motor Position
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
Check the mode selection dam
per control motor b
y the followin
g procedures.
2004 Mitsubishi Endeavor LS
2004 HVAC Heater Air Conditioning, Ventilation - Endeavor
Page 2134 of 3870
Fig. 95: Checking Mode Selection Damper Control Motor Procedure
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
Q: Is the mode selection damper control motor in good condition?
YES:
Replace the A/C-ECU. Then go to Step 7.
NO:
Replace the mode selection damper control motor and potentiometer.
Then go to Step 7.
STEP 7. Recheck for diagnostic trouble code.
Check again if the DTC is set.
1. Connect scan tool MB991958 to the data link connec
tor
2004 Mitsubishi Endeavor LS
2004 HVAC Heater Air Conditioning, Ventilation - Endeavor
Page 2135 of 3870
Fig. 96: Connecting Scan Tool MB991958 To Data Link Connector
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y of MITSUBISHI MOTOR SALES OF AMERICA
.
2004 Mitsubishi Endeavor LS
2004 HVAC Heater Air Conditioning, Ventilation - Endeavor
Page 2136 of 3870

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