Mitsubishi Evolution X. Manual — part 585
DIAGNOSIS
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KEYLESS OPERATION SYSTEM (KOS)
42B-247
STEP 7. Using scan tool MB991958, read the diagnostic
trouble code.
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
scan tool (M.U.T.-III)
(2) Turn the ignition switch to the "ON" position.
(3) Check whether the KOS-ECU related DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?
YES : Diagnose the KOS-ECU. Refer to
.
NO : Go to Step 8.
STEP 8. Check of the troubles
Check if the keyless entry answerback function works normally.
Q: Is the check result normal?
YES : The diagnosis is complete.
NO : Replace ETACS-ECU.
AC608435
Data link connector
MB991827
MB991824
MB991910
AB
DIAGNOSIS
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KEYLESS OPERATION SYSTEM (KOS)
42B-248
Inspection Procedure 17: The Trunk is not opened when the keyless operation key "TRUNK" button is
operated.
CAUTION
Before replacing the ECU, ensure that the power
supply circuit, the ground circuit and the com-
munication circuit are normal.
AC708974
ETACS-ECU
BLA
CK
BLA
CK
GREEN
BLA
CK
-BLUE
YELLO
W
-GREEN
WHITE
-BLUE
KEYLESS OPERATION KEY
"TRUNK"BUTTON
INPUT SIGNAL
INTERFACE
CIRCUIT
CAN DRIVE
CIRCUIT
JOINT
CONNECTOR
(CAN1)
Keyless Operation Key "TRUNK" Input Signal
AC
JOINT
CONNECTOR
(6)
RECEIVER
RECEIVER
ANTENNA
ASSEMBLY
RED
RED
GREEN -RED
GREEN -RED
YELLOW
-GREEN
YELLOW
-GRAY
YELLOW
-GRAY
BROWN -WHITE
BROWN -WHITE
RED- WHITE
RED- WHITE
RED- WHITE
RED- BLA
CK
RED- WHITE
RED
GREEN -RED
BROWN -WHITE
RED- WHITE
TRUNK
LID OPEN
RELAY
TRUNK LID
LATCH
KOS-ECU
DIAGNOSIS
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KEYLESS OPERATION SYSTEM (KOS)
42B-249
.
TECHNICAL DESCRIPTION (COMMENT)
The receiver antenna assembly receives the trunk
signals from the keyless operation key, and sends
them to KOS-ECU, and further to ETACS-ECU. Then
the ETACS-ECU determines to actuate the trunk
open function of the keyless entry system.
.
TROUBLESHOOTING HINTS
• The keyless operation key may be defective
• The receiver antenna assembly may be defective
• The KOS-ECU may be defective
• The ETACS-ECU may be defective
• The wiring harness or connectors may have
loose, corroded, or damaged terminals, or termi-
nals pushed back in the connector
DIAGNOSIS
Required Special Tools:
• MB992006: Extra fine probe
• MB991223: Harness set
• MB991958 Scan Tool (M.U.T.-III Sub Assembly)
• MB991824: Vehicles Communication Interface (V.C.I.)
• MB991827 M.U.T.-III USB Cable
• MB991910 M.U.T.-III Main Harness A
STEP 1. Check the operation of the keyless operation
system (keyless entry system).
Operate the keyless operation key and check that all doors lock
and unlock.
Q: Is the check result normal?
YES : Go to Step 2.
NO : Refer to inspection procedure 14: "Keyless entry
system does not work
."
AC708972AC
Connector: C-311
ETACS-ECU
AC708955AL
Connector: D-17
D-17 (BR)
AC708970AD
Connectors: F-19, F-27
F-27
F-19
DIAGNOSIS
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KEYLESS OPERATION SYSTEM (KOS)
42B-250
STEP 2. Using scan tool MB991958, read the diagnostic
trouble code.
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
scan tool (M.U.T.-III)
(2) Turn the ignition switch to the "ON" position.
(3) Check whether the KOS-ECU related DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?
YES : Diagnose the KOS-ECU. Refer to
.
NO : Go to Step 3.
AC608435
Data link connector
MB991827
MB991824
MB991910
AB
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