Mitsubishi Galant 9G. Manual — part 1303
DIAGNOSIS
TSB Revision
CONTROLLER AREA NETWORK (CAN)
54C-316
STEP 14. Check the CAN_L and H lines (communication
lines only) between joint connector (3) and the A/C-ECU for
a short circuit. Measure the resistance at joint connector
(3) C-02.
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 resistance at the
wiring harness side of joint connector (3) C-02.
(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
TSB Revision
CONTROLLER AREA NETWORK (CAN)
54C-317
(4) Measure the resistance between joint connector (3)
terminals 6 and 17.
OK: 1 k
Ω or more
CAUTION
Strictly observe the specified wiring harness repair proce-
dure. For details refer to
Q: Does the resistance measure 1 k
Ω or more?
YES : If the resistance measures 1 k
Ω or more, go to Step
NO : If the resistance measures less than 1 k
Ω, repair the
wiring harness between joint connector (3) and the
A/C-ECU connector.
STEP 15. Check the A/C-ECU for short circuit. Measure the
resistance at 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
.
(1) Disconnect 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 resistance at the component
side of A/C-ECU connector C-10 <manual air conditioning
system (low)> or C-15 <manual air conditioning system
(middle) or automatic air conditioning system>.
AC209438
AC209438
TEST
HARNESS
AS
TEST
HARNESS
1110 9 8 7 6 5 4 3 2 1
22 21201918 1716 15 14 1312
HARNESS SIDE: C-02
AC305234AB
C-10 HARNESS SIDE
C-15 HARNESS SIDE
CONNECTORS: C-10, C-15
C-10 (B)
C-15 (B)
DIAGNOSIS
TSB Revision
CONTROLLER AREA NETWORK (CAN)
54C-318
(2) Measure the resistance between A/C-ECU connector
terminals 5 and 6 <manual air conditioning system (low)> or
terminals 14 and 15 <manual air conditioning system
(middle) or automatic air conditioning system>.
OK: 1 k
Ω or more
Q: Does the resistance measure 1 k
Ω or more?
YES : If the resistance measures 1 k
Ω or more, diagnose
CAN bus lines thoroughly by referring to
NO : If the resistance measures less than 1 k
Ω, replace the
A/C-ECU.
STEP 16. Check the CAN_L and H lines (communication
lines including the SRS-ECU) between joint connector (3)
and the SRS-ECU for a short circuit. Measure the
resistance at joint connector (3) C-02.
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 measure the
resistance at the wiring harness side of joint connector (3)
C-02.
(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.
AC209438
AC209438
COMPONENT SIDE: C-10
AT
TEST
HARNESS
AC209438
AC209438
COMPONENT SIDE: C-15
AY
TEST
HARNESS
TEST
HARNESS
AC305231AP
CONNECTOR: C-02
DIAGNOSIS
TSB Revision
CONTROLLER AREA NETWORK (CAN)
54C-319
(4) Measure the resistance between joint connector (3)
terminals 3 and 14.
OK: 1 k
Ω or more
Q: Does the resistance measure 1 k
Ω or more?
YES : If the resistance measures 1 k
Ω or more, go to Step
NO : If the resistance measures less than 1 k
Ω, go to Step
STEP 17. Check intermediate connector C-22 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
Q: Is intermediate connector C-22 in good condition?
YES : Go to Step 18.
NO : Repair the damaged parts.
AC209438
11
22
10
21
9
20
8
19
7
18
6
17
5
16
4
15
3
14
2
13
1
12
TEST
HARNESS
AV
TEST
HARNESS
HARNESS SIDE: C-02
AC305233 AI
CONNECTOR: C-22
C-22 (Y)
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