Mitsubishi Evolution X. Manual - part 1266

 

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Mitsubishi Evolution X. Manual - part 1266

 

 

AUTO A/C DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55-15

STEP 2. Recheck for diagnostic trouble code.
Recheck if the DTC is set.
(1) Erase the DTC.
(2) Turn the ignition switch to "ON" position.
(3) Check if the DTC is set.
Q: Is the DTC set?

YES : Go to Step 3. 
NO :  It can be assumed that this malfunction is intermittent. 

Refer to GROUP 00, How to Use 
Troubleshooting/Inspection Service Points 

− How to 

Cope with Intermittent Malfunctions 

P.00-15

.

STEP 3. Check A/C control panel connector C-123 for 
loose, corroded or damaged terminals, or terminals 
pushed back in the connector.
Q: Is A/C control panel connector C-123 in good condition?

YES : Go to Step 4.
NO :  Repair or replace the connector. Refer to GROUP 

00E, Harness Connector Inspection 

P.00E-2

.

STEP 4. Measure the voltage at A/C control panel 
connector C-123.
(1) Disconnect A/C control panel connector C-123, and 

measure the voltage at the harness side.

(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal 6 and ground.

• The measured value should be approximately 12 volts 

(battery positive voltage).

Q: Is the measured voltage approximately 12 volts?

YES :  Go to Step 6.
NO :   Go to Step 5.

STEP 5. Check the wiring harness between A/C control 
panel connector C-123 (terminal 6) and ETACS-ECU 
connector C-317 (terminal 5).
Q: Is the wiring harness between A/C control panel 

connector C-123 (terminal 6) and ETACS-ECU connector 
C-317 (terminal 5) in good condition?
YES : It can be assumed that this malfunction is intermittent. 

Refer to GROUP 00, How to Use 
Troubleshooting/Inspection Service Points 

− How to 

Cope with Intermittent Malfunctions 

P.00-15

.

NO :  Repair the wiring harness.

AC608254CI

Connector C-123
(Harness side)

AUTO A/C DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55-16

STEP 6. Measure the resistance at A/C control panel 
connector C-123.
(1) Disconnect A/C control panel connector C-123, and 

measure the resistance at the wiring harness side.

(2) Measure the resistance value between terminal 7 and 

ground.

• The measured value should be 2 ohms or less.

Q: Does the measured resistance value correspond with 

this range?
YES :  Go to Step 8.
NO :   Go to Step 7.

STEP 7. Check the wiring harness between A/C control 
panel connector C-123 (terminal 7) and ground.
Q: Is the wiring harness between A/C control panel 

connector C-123 (terminal 7) and ground in good 
condition?
YES : It can be assumed that this malfunction is intermittent. 

Refer to GROUP 00, How to Use 
Troubleshooting/Inspection Service Points 

− How to 

Cope with Intermittent Malfunctions 

P.00-15

.

NO :  Repair the wiring harness.

STEP 8. Check A/C-ECU connector C-22 for loose, 
corroded or damaged terminals, or terminals pushed back 
in the connector.
Q: Is A/C-ECU connector C-22 in good condition?

YES : Go to Step 9.
NO :  Repair or replace the connector. Refer to GROUP 

00E, Harness Connector Inspection 

P.00E-2

.

STEP 9. Check the wiring harness between A/C-ECU 
connector C-22 (terminal 9 and 10) and A/C control panel 
connector C-123 (terminals 9 and 1).
Q: Is the wiring harness between A/C-ECU connector C-22 

(terminal 9 and 10) and A/C control panel connector 
C-123 (terminals 9 and 1) in good condition?
YES : Go to Step 10.
NO :  Repair the wiring harness.

AC608255BP

Connector C-123
(Harness side)

AUTO A/C DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55-17

STEP 10. Recheck for diagnostic trouble code.
Recheck if the DTC is set.
(1) Erase the DTC.
(2) Turn the ignition switch to "ON" position.
(3) Check if the DTC is set.
Q: Is the DTC set?

YES : Replace the A/C control panel. Then go to Step 11.
NO :  It can be assumed that this malfunction is intermittent. 

Refer to GROUP 00, How to Use 
Troubleshooting/Inspection Service Points 

− How to 

Cope with Intermittent Malfunctions 

P.00-15

.

STEP 11. Recheck for diagnostic trouble code.
Recheck if the DTC is set.
(1) Erase the DTC.
(2) Turn the ignition switch to "ON" position.
(3) Check if the DTC is set.
Q: Is the DTC set?

YES : Replace the A/C-ECU.
NO :  It can be assumed that this malfunction is intermittent. 

Refer to GROUP 00, How to Use 
Troubleshooting/Inspection Service Points 

− How to 

Cope with Intermittent Malfunctions 

P.00-15

.

DTC B1003: Mode Dial SW Error

A/C Control Panel Circuit

A/C-ECU

A/C
CONTROL
PANEL

CPU

INTERFACE
CIRCUIT

AC708601

AUTO A/C DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55-18

.

DTC SET CONDITION

DTC B1003 will be set when the A/C-ECU cannot receive the 
signal of mode selection knob.

.

TECHNICAL DESCRIPTION (COMMENT)

Current trouble

• The A/C-ECU, the A/C control panel, or connector(s) or wir-

ing between the two may be defective.

Past trouble

• If DTC B1003 is stored as a past trouble, carry out diagno-

sis with particular emphasis on wiring and connector(s) 
between the A/C-ECU and the A/C control panel. If the con-
nectors 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 control panel.

• Malfunction of the A/C-ECU.

DIAGNOSIS

Required Special Tool:

•  MB991958: Scan Tool (M.U.T.-III Sub Assembly)

• MB991824: Vehicle Communication Interface (V.C.I.)

• MB991827: M.U.T.-III USB Cable

• MB991910: M.U.T.-III Main Harness A

AC708951AJ

Connectors: C-22, C-123

C-123

C-22 (B)

 

 

 

 

 

 

 

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