Mitsubishi Galant (2004+). Manual — part 222
SYMPTOM PROCEDURES
TSB Revision
SIMPLIFIED WIRING SYSTEM (SWS)
54B-79
INSPECTION PROCEDURE A-3: Communication with the ETACS-ECU is not Possible.
RELAY
BOX
BATTERY
IGNITION
SWITCH (IG1)
COLUMN
SWITCH
COLUMN -ECU
ETACS-
ECU
POWER
SOURCE
JUNCTION BLOCK SIDE
ETACS-ECU Power Supply and SWS Communication Circuit
SYMPTOM PROCEDURES
TSB Revision
SIMPLIFIED WIRING SYSTEM (SWS)
54B-80
.
CIRCUIT OPERATION
• The power supply to the ETACS-ECU is provided
by the battery and the ignition switch (IG1).
• If the power supply system from the battery is
defective, the system operates by the power sup-
ply from the ignition switch (IG1).
.
TECHNICAL DESCRIPTION (COMMENT)
It is suspected that the power supply circuit to the
ETACS-ECU is defective, or the wiring harness
between the SWS monitor kit and the ETACS-ECU
or their connector(s) is damaged. If the battery power
supply circuit to the ECU (terminal 20 of the
ETACS-ECU) is damaged, also check the power
supply circuit from the ignition switch (IG1) (terminal
8 of the ETACS-ECU), and repair if necessary. If the
ground circuit to the ECU (terminal 3 of the
ETACS-ECU) is damaged, also check the ground cir-
cuit to the sensor (terminal 56 of the ETACS-ECU),
and repair if necessary.
.
TROUBLESHOOTING HINTS
• The wiring harness or connectors may have
loose, corroded, or damaged terminals, or termi-
nals pushed back in the connector
• The ETACS-ECU may be defective
DIAGNOSIS
Required Special Tools:
• MB991223: Harness Set
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827: MUT-III USB Cable
• MB991910: MUT-III Main Harness A
AC305231BC
CONNECTORS: C-01, C-03
C-01
C-03
AC305415
CONNECTORS: C-204, C-214
AQ
C-204
C-214
AC305413
C-219
C-218 (GR)
CONNECTORS: C-218, C-219
AM
AC305235AC
CONNECTOR: C-309
SYMPTOM PROCEDURES
TSB Revision
SIMPLIFIED WIRING SYSTEM (SWS)
54B-81
STEP 1. Check ETACS-ECU connectors C-218 and C-219
for loose, corroded or damaged terminals, or terminals
pushed back in the connector.
Q: Are ETACS-ECU connectors C-218 and C-219 in good
condition?
YES : Go to Step 2.
NO : Repair or replace the damaged component(s). Refer
to GROUP 00E, Harness Connector Inspection
. The system should communicate with the
ETACS-ECU normally.
STEP 2. Check the battery power supply circuit to the
ETACS-ECU. Measure the voltage at ETACS-ECU
connector C-219.
(1) Disconnect ETACS-ECU connector C-219 and measure the
voltage available at the junction block side of the connector.
(2) Measure the voltage between terminal 20 and ground.
• The voltage should measure approximately 12 volts
(battery positive voltage).
Q: Is the measured voltage approximately 12 volts (battery
positive voltage)?
YES : Go to Step 4.
NO : Go to Step 3.
AC305414
CONNECTORS: C-218, C-219
JUNCTION BLOCK
(REAR VIEW)
C-219
C-218 (GR)
HARNESS SIDE
C-218
C-219
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
JUNCTION BLOCK SIDE
AC
AC305413 AG
CONNECTOR: C-219
JUNCTION BLOCK SIDE
JUNCTION BLOCK
(REAR VIEW)
AC209836
2019 18 1716 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
AE
CONNECTOR C-219
(JUNCTION BLOCK SIDE)
SYMPTOM PROCEDURES
TSB Revision
SIMPLIFIED WIRING SYSTEM (SWS)
54B-82
STEP 3. Check the wiring harness between ETACS-ECU
connector C-219 (terminal 20) and the battery.
NOTE: Also check joint connector C-01 and junction block con-
nector C-214 for loose, corroded, or damaged terminals, or ter-
minals pushed back in the connector. If joint connector C-01 or
junction block connector C-214 are damaged, repair or replace
the damaged component(s) as described in GROUP 00E, Har-
ness Connector Inspection
.
Q: Is the wiring harness between ETACS-ECU connector
C-219 (terminal 20) and the battery in good condition?
YES : No action is necessary and testing is complete.
NO : The wiring harness may be damaged or the
connector(s) may have loose, corroded or damaged
terminals, or terminals pushed back in the connector.
Repair the wiring harness as necessary. The system
should communicate with the ETACS-ECU normally.
AC305413 AG
CONNECTOR: C-219
JUNCTION BLOCK SIDE
JUNCTION BLOCK
(REAR VIEW)
AC305231
CONNECTOR: C-01
BO
AC305415
C-214
CONNECTOR: C-214
AU
JUNCTION BLOCK
(FRONT VIEW)
HARNESS SIDE
10
1
6
14
5
12
13
4
11
7
2
3
8
9
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