Mitsubishi Galant (2004+). Manual — part 498
DIAGNOSIS
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CONTROLLER AREA NETWORK (CAN)
54C-603
TROUBLE JUDGMENT
If the MUT-III cannot received signals from the
A/C-ECU, CAN bus line connector(s) are broken or
an open circuit has occurred.
.
COMMENTS ON TROUBLE SYMPTOM
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
• The wiring harness or connectors may have
loose, corroded, or damage terminals, or termi-
nals pushed back in the connector
• The A/C-ECU may be defective
DIAGNOSIS
Required Special Tool:
• MB991223: Harness Set
DIAGNOSIS
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CONTROLLER AREA NETWORK (CAN)
54C-604
STEP 1. Check joint connector (3) C-02 and A/C-ECU
connector C-10 <manual air conditioning system (low)> or
C-15 <manual air conditioning system (middle) or
automatic air conditioning system> for loose, corroded or
damaged terminals, or terminals pushed back in the
connector.
CAUTION
The strand end of the twisted wire should be within 10 cm
(4 inches) from the connector. For details refer to
Check the joint connector at the wiring harness side for loose,
corroded or damaged terminals, or terminals pushed back in
the connector, and also check the short pin behind the connec-
tor for corrosion, deformation and delamination.
Q: Are joint connector (3) C-02 and A/C-ECU connector
C-10 <manual air conditioning system (low)> or C-15
<manual air conditioning system (middle) or automatic
air conditioning system> in good condition?
YES : Go to Step 2.
NO : Repair the damaged parts. Replace the joint
connector as necessary.
AC305231AP
CONNECTOR: C-02
AC305234AB
C-10 HARNESS SIDE
C-15 HARNESS SIDE
CONNECTORS: C-10, C-15
C-10 (B)
C-15 (B)
AC209350
1
12
2
13
3
14
4
15
5
16
6
17
7
18
8
19
9
20
10
21
11
22
AB
SHORT PIN
DIAGNOSIS
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CONTROLLER AREA NETWORK (CAN)
54C-605
STEP 2. Check the CAN bus lines between joint connector
(3) and the A/C-ECU. Measure the resistance between joint
connector (3) C-02 and A/C-ECU connector C-10 <manual
air conditioning system (low)> or C-15 <manual air
conditioning system (middle) or automatic air conditioning
system>.
CAUTION
A digital multimeter should be used. For details refer to
CAUTION
The test wiring harness should be used. For details refer to
(1) Disconnect joint connector (3) C-02 and A/C-ECU
connector C-10 <manual air conditioning system (low)> or
C-15 <manual air conditioning system (middle) or automatic
air conditioning system>, and measure the resistances at
the wiring harness sides of joint connector (3) C-02 and
A/C-ECU connector C-10 <manual air conditioning system
(low)> or C-15 <manual air conditioning system (middle) or
automatic air conditioning system>.
(2) Turn the ignition switch to the "LOCK" (OFF) position.
CAUTION
Disconnect the negative battery terminal. For details refer
to
.
(3) Disconnect the negative battery terminal.
AC305231AP
CONNECTOR: C-02
AC305234AB
C-10 HARNESS SIDE
C-15 HARNESS SIDE
CONNECTORS: C-10, C-15
C-10 (B)
C-15 (B)
DIAGNOSIS
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CONTROLLER AREA NETWORK (CAN)
54C-606
(4) Measure the resistance between joint connector (3)
terminal 17 and A/C-ECU connector terminal 6 <manual air
conditioning system (low)> or 14 <manual air conditioning
system (middle) or automatic air conditioning system>.
OK: 2 ohms or less
AC204582CF
HARNESS SIDE: C-10
TEST
HARNESS
HARNESS SIDE: C-02
TEST HARNESS
11
22
10
21
9
20
8
19
7
18
6
17
5
16
4
15
3
14
2
13
1
12
AC204582
AC204582
HARNESS SIDE: C-02
TEST HARNESS
CG
11
22
10
21
9
20
8
19
7
18
6
17
5
16
4
15
3
14
2
13
1
12
TEST
HARNESS
HARNESS SIDE: C-15
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