Mitsubishi Evolution X. Manual — part 1272
AUTO A/C DIAGNOSIS
TSB Revision
HEATER, AIR CONDITIONING AND VENTILATION
55-39
STEP 1. Using scan tool MB991958, diagnose the CAN bus
line
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958. Refer to "How to connect the
Scan Tool (M.U.T.-III)
(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the CAN bus line found to be normal?
YES : Go to Step 2.
NO : Repair the CAN bus line. (Refer to GROUP 54C,
).
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
.
STEP 3. Check A/C control panel connector C-123 and
A/C-ECU connector C-22 for loose, corroded or damaged
terminals, or terminals pushed back in the connector.
Q: Are A/C control panel connector C-123 and A/C-ECU
connector C-22 in good condition?
YES : Go to Step 4.
NO : Repair or replace the connector. Refer to GROUP
00E, Harness Connector Inspection
AC608435
Data link connector
MB991827
MB991824
MB991910
AB
AUTO A/C DIAGNOSIS
TSB Revision
HEATER, AIR CONDITIONING AND VENTILATION
55-40
STEP 4. 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 5.
NO : Repair the wiring harness.
STEP 5. 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 6.
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
.
STEP 6. 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
.
AUTO A/C DIAGNOSIS
TSB Revision
HEATER, AIR CONDITIONING AND VENTILATION
55-41
DTC B223B: Control Panel Improperly Assembled
.
DTC SET CONDITION
DTC B223B will be set when the A/C control panel sends an
abnormal data, the A/C control panel for RHD is improperly
assembled, or the ETACS-ECU sends incorrect vehicle infor-
mation (information for RHD is sent).
.
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 B223B 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.
.
A/C Control Panel Circuit
A/C-ECU
A/C
CONTROL
PANEL
CPU
INTERFACE
CIRCUIT
AC708601
AC708951AJ
Connectors: C-22, C-123
C-123
C-22 (B)
AUTO A/C DIAGNOSIS
TSB Revision
HEATER, AIR CONDITIONING AND VENTILATION
55-42
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
STEP 1. Using scan tool MB991958, diagnose the CAN bus
line
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958. Refer to "How to connect the
Scan Tool (M.U.T.-III)
(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the CAN bus line found to be normal?
YES : Go to Step 2.
NO : Repair the CAN bus line. (Refer to GROUP 54C,
).
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 DCT 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
.
AC608435
Data link connector
MB991827
MB991824
MB991910
AB
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