Mitsubishi 380. Manual — part 202
AUTO A/C DIAGNOSIS
HEATER, AIR CONDITIONING AND VENTILATION
55-104
INSPECTION PROCEDURE 7: The A/C Indicator Flashes.
.
TECHNICAL DESCRIPTION (COMMENT)
If the A/C indicator flashes, inadequate refrigerant
quantity, the ambient air temperature sensor circuit
or the A/C pressure sensor circuit is suspected.
.
TROUBLESHOOTING HINTS
• Malfunction of the A/C pressure sensor
• Malfunction of the ambient air temperature sen-
sor
• Malfunction of the A/C-ECU
• Refer to component locations GROUP-
• Refer to configuration diagrams GROUP-
• Refer to circuit diagrams GROUP-
DIAGNOSIS
Required Special Tools:
• MB991223: Test Harness Set
• : Scan Tool (MUT-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827: MUT-III USB Cable
• MB991910: MUT-III Main Harness A (Vehicles with CAN
communication system)
STEP 1. Using scan tool , read the diagnostic trouble code.
Check if an A/C-ECU DTC is set.
(1) Connect scan tool 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 check result satisfactory?
YES : Go to Step 2.
NO : Refer to DIAGNOSTIC TROUBLE CODE CHART
.
AC305206
A-30 (B)
AZ
CONNECTOR: A-30
25DB068A
C-16 (B)
C-15 (B)
CONNECTORS: C-15, C-16
00DB076A
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
AUTO A/C DIAGNOSIS
HEATER, AIR CONDITIONING AND VENTILATION
55-105
STEP 2. Using scan tool , check data list item 61: A/C
pressure sensor.
CAUTION
To prevent damage to scan tool , always turn the ignition
switch to the "LOCK" (OFF) position before connecting or
disconnecting scan tool .
(1) Connect scan tool to the data link connector.
(2) Assemble a manifold gauge onto the high pressure service
valve.
(3) Turn ON the engine and then turn ON the air conditioner
switch.
(4) Set scan tool to the data reading mode for item 61: A/C
pressure sensor.
• Check that the refrigerant pressure matches the dis-
played value on the scan tool.
(5) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the sensor within the specified range?
YES : Go to Step 7.
NO : Go to Step 3.
00DB076A
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
AUTO A/C DIAGNOSIS
HEATER, AIR CONDITIONING AND VENTILATION
55-106
STEP 3. Check A/C pressure sensor connector A-30 for
loose, corroded or damaged terminals, or terminals
pushed back in the connector.
Q: Is A/C pressure sensor connector A-30 in good
condition?
YES : Go to Step 4.
NO : Repair or replace the connector. Refer to GROUP
00E, Harness Connector Inspection
. Check
that the air conditioning works normally.
AC305206
CONNECTOR: A-30
AY
HARNESS SIDE
A-30 (B)
25DB070A
CONNECTORS: C-15, C-16
C-16 (B)
HARNESS SIDE
C-16
C-15
C-15 (B)
HARNESS SIDE
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
AUTO A/C DIAGNOSIS
HEATER, AIR CONDITIONING AND VENTILATION
55-107
STEP 4. Check the A/C pressure sensor.
(1) Assemble a gauge manifold on the high pressure service
valve.
(2) Disconnect the A/C pressure sensor connector and connect
special tool test harness MB991658 as shown in the
illustration.
(3) Turn ON the engine and then turn ON the air conditioner
switch.
(4) At this time, check to see that the voltage of A/C pressure
sensor terminal No. 2 reflects the specifications of the
figure.
NOTE: The allowance shall be defined as
±5%.
Q: Is the A/C pressure sensor in good condition?
YES : Go to Step 5.
NO : Replace the A/C pressure sensor. Check that the air
conditioning works normally.
AC305034
A/C PRESSURE SENSOR
AD
AC307368
A/C
PRESSURE
SENSOR
SIDE
MB991658
AB
HARNESS SIDE
AC208297AB
REFRIGERANT PRESSURE (MPa)
OUTPUT VOLTAGE
(V)
0
1
2
3
5
4
1
2
3
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