Mitsubishi Evolution X. Manual — part 1269
AUTO A/C DIAGNOSIS
TSB Revision
HEATER, AIR CONDITIONING AND VENTILATION
55-27
DTC B1031, B1032: Fin Thermo Sensor System
.
DTC SET CONDITION
• DTC B1031 is set if there is a short circuit in the fin thermo
sensor input circuit.
• DTC B1032 is set if there is a defective connector connec-
tion, or if there is an open circuit in the harness.
.
TECHNICAL DESCRIPTION (COMMENT)
Current trouble
• The A/C-ECU, the fin thermo sensor, or connector(s) or wir-
ing 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 connec-
tor(s) between the A/C-ECU and the fin 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.
.
Fin Thermo Sensor Circuit
A/C-ECU
FIN THERMO
SENSOR
AC708602
AC708951AK
C-20 (B)
Connectors: C-20, C-113
C-113
AUTO A/C DIAGNOSIS
TSB Revision
HEATER, AIR CONDITIONING AND VENTILATION
55-28
TROUBLESHOOTING HINT
• Malfunction of connector.
• Malfunction of the harness.
• Malfunction of the fin thermo sensor.
• 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 DTCset?
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
AUTO A/C DIAGNOSIS
TSB Revision
HEATER, AIR CONDITIONING AND VENTILATION
55-29
STEP 3. Check fin thermo sensor connector C-113 and
A/C-ECU connector C-20 for loose, corroded or damaged
terminals, or terminals pushed back in the connector.
Q: Are fin thermo sensor connector C-113 and A/C-ECU
connector C-20 in good condition?
YES : Go to Step 4.
NO : Repair or replace the connector. Refer to GROUP
00E, Harness Connector Inspection
STEP 4. Check the wiring harness between A/C-ECU
connector C-20 (terminal 22 and 21) and fin thermo sensor
connector C-113 (terminals 1 and 2).
Q: Is the wiring harness between A/C-ECU connector C-20
(terminal 22 and 21) and fin thermo sensor connector
C-113 (terminals 1 and 2) in good condition?
YES : Go to Step 5.
NO : Repair the wiring harness.
STEP 5. Check the fin thermo sensor.
Measure the resistance between connector terminals 1 and 2
under at least two different temperatures. The resistance val-
ues should generally match those in the graph.
NOTE: The temperature at the check should not exceed the
range in the graph.
Q: Is the fin thermo sensor in good condition?
YES : Replace the A/C-ECU. Then go to Step 6.
NO : Replace the fin thermo sensor. Then go to Step 6.
STEP 6. Recheck for diagnostic trouble code.
Check again if the DTC is set.
(1) Connect scan tool MB991958 to the data link connector
(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 DTC set?
YES : Return to Step 1.
NO : The procedure is complete.
AC609399
25
20
15
10
5
0
AB
10
(50)
30
(86)
Resistance
(k
Ω)
Temperature ºC (ºF)
0
(32)
40
(104)
-10
(14)
20
(68)
AUTO A/C DIAGNOSIS
TSB Revision
HEATER, AIR CONDITIONING AND VENTILATION
55-30
DTC B1034, B1035: Ambient air temperature Sensor System
.
DTC SET CONDITION
• DTC B1034 is set if there is a short circuit in the ambient air
temperature sensor input circuit.
• DTC B1035 is set if there is a defective connector connec-
tion, or if there is an open circuit in the harness.
.
TECHNICAL DESCRIPTION (COMMENT)
Current trouble
• The A/C-ECU, the ambient air temperature sensor, or con-
nector(s) or wiring between the two may be defective.
Past trouble
• If DTC B1034 or B1035 is stored as a past trouble, carry out
diagnosis with particular emphasis on wiring and connec-
tor(s) between the A/C-ECU and the ambient air tempera-
ture 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.
.
Ambient Temperature Sensor Circuit
AMBIENT AIR
TEMPERATURE
SENSOR
ETACS-ECU
ANALOG
INTERFACE
CIRCUIT
AC708614
AC708949AE
Connector: A-49
A-49 (B)
AC708972AP
Connector: C-312
ETACS-ECU
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст