Mitsubishi Evolution X. Manual — part 541
DIAGNOSIS
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KEYLESS OPERATION SYSTEM (KOS)
42B-71
STEP 5. Replace the key reminder switch, and check
whether the diagnostic trouble code is reset.
(1) Erase the DTC.
(2) Turn the ignition switch from the "LOCK" (OFF) position to
the "ON" position.
(3) Check if the DTC is set.
Q: Is the DTC set?
YES : Replace KOS-ECU and register the ID codes (Refer
to
NO : The trouble can be an intermittent malfunction (Refer
to GROUP 00
− How to use
Troubleshooting/inspection Service Points
− How to
Cope with Intermittent Malfunction
DIAGNOSIS
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KEYLESS OPERATION SYSTEM (KOS)
42B-72
DTC B240A: FR antenna(outdoor) open
CAUTION
When replacing the ECU, always check that the
communication circuit is normal.
AC609050
KOS-ECU
KEYLESS
OPERATION
KEY
OUTSIDE TRANSMISSION
ANTENNA ASSEMBLY
(DRIVER'S SIDE)
SKY BLUE
SKY BLUE
SKY BLUE
RED- BLA
CK
RED- BLA
CK
RED- BLA
CK
Outside Transmission Antenna assembly (Driver's Side) Circuit
AC
RED- YELLO
W
RED-YELLO
W
AC708950AZ
Connector: C-05
AC708951AZ
Connector: C-23
DIAGNOSIS
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KEYLESS OPERATION SYSTEM (KOS)
42B-73
.
DTC SET CONDITION
If an open circuit is detected in the outside transmit-
ter antenna (driver's side), the DTC is set.
.
TECHNICAL DESCRIPTION (COMMENT)
When the ignition push switch is pressed, or when
the antenna open circuit detection request is
received from the diagnosis function, the failure is
detected.
.
TROUBLESHOOTING HINTS
• Malfunction of the outside transmitter antenna
assembly (driver's side)
• Malfunction of the KOS-ECU
• Damaged wiring harness and connectors
DIAGNOSIS
STEP 1. Check KOS-ECU connector C-05 and outside
transmitter antenna assembly (driver's side) connector
D-23 for loose, corroded or damaged terminals, or
terminals pushed back in the connector.
Q: Are KOS-ECU connector C-05 and outside transmitter
antenna assembly (driver's side) connector D-23 in
good condition?
YES : Go to Step 2.
NO : Repair or replace the damaged component(s). Refer
to GROUP 00E, Harness Connector Inspection
. Check that the outside transmitter antenna
assembly (driver's side) works normally.
AC708955AP
Connector: D-23
DIAGNOSIS
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KEYLESS OPERATION SYSTEM (KOS)
42B-74
STEP 2. Check the wiring harness between the KOS-ECU
connector C-05 (terminal Nos. 6, 17, 40) and outside
transmitter antenna assembly (driver's side) connector
D-23 (terminal Nos. 3, 2, 1) for open circuit.
(1) Disconnect KOS-ECU connector C-05 and outside
transmitter antenna assembly (driver's side) connector
D-23, and check the wiring harness.
(2) Check the wiring harness between KOS-ECU connector
C-05 (terminal No.6) and outside transmitter antenna
assembly (driver's side) connector D-23 (terminal No.3).
OK: Continuity exists (2
Ω or less)
(3) Check the wiring harness between KOS-ECU connector
C-05 (terminal No.17) and outside transmitter antenna
assembly (driver's side) connector D-23 (terminal No.2).
OK: Continuity exists (2
Ω or less)
AC709707ET
Harness side: C-05
Harness side: D-23
AC709707EU
Harness side: C-05
Harness side: D-23
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