Mitsubishi Evolution X. Manual — part 578
DIAGNOSIS
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KEYLESS OPERATION SYSTEM (KOS)
42B-219
STEP 1. 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 2.
STEP 2. Check KOS-ECU connector C-05 and lock switch
(front door: RH) connector E-06 for loose, corroded or
damaged terminals, or terminals pushed back in the
connector.
Q: Are KOS-ECU connector C-05 and lock switch (front
door: RH) connector E-06 in good condition?
YES : Go to Step 3.
NO : Repair or replace the damaged component(s). Refer
to GROUP 00E, Harness Connector Inspection
. Check that the passenger’s door lock switch
works normally.
AC608435
Data link connector
MB991827
MB991824
MB991910
AB
DIAGNOSIS
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KEYLESS OPERATION SYSTEM (KOS)
42B-220
STEP 3. Check the lock switch (front door: RH).
(1) Remove the door outside handle base. Refer to GROUP
42A, Door Handle and Latch
.
(2) Check continuity when the lock switch (front door: RH) is
operated to "ON" or "OFF" position.
Q: Is the lock switch (front door: RH) normal?
YES : Go to Step 4.
NO : Replace the door outside handle base (front door:
RH).
Switch position
Terminal number Specified
condition
ON
1
− 2
Continuity exists
(2
Ω or less)
OFF
1
− 2
Open circuit
AC506541AB
Lock switch
Door outside
handle base
DIAGNOSIS
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KEYLESS OPERATION SYSTEM (KOS)
42B-221
STEP 4. Check the wiring harness between the KOS-ECU
connector C-05 (terminal No. 23) and lock switch (front
door: RH) connector E-06 (terminal No. 1), and between
lock switch (front door: RH) connector E-06 (terminal No.
2) and ground for open circuit.
(1) Disconnect KOS-ECU connector C-05 and lock switch
(front door: RH) connector E-06, and check the wiring
harness.
(2) Check the wiring harness between KOS-ECU connector
C-05 (terminal No.23) and lock switch (front door: RH)
connector E-06 (terminal No.1).
OK: Continuity exists (2
Ω or less)
(3) Check the wiring harness between lock switch (front door:
RH) connector E-06 (terminal No.2) and ground.
OK: Continuity exists (2
Ω or less)
Q: Is the wiring harness between KOS-ECU connector C-05
(terminal No. 23) and lock switch (front door: RH)
connector E-06 (terminal No. 1), and between lock
switch (front door: RH) connector E-06 (terminal No. 2)
and ground in good condition?
YES : Go to Step 5.
NO (KOS-ECU connector C-05 terminal No.23
− lock
switch (front door: RH) connector E-06 terminal No.1.) :
Repair the wiring harness between KOS-ECU
connector C-05 (terminal No.23) and lock switch
(front door: RH) connector E-06 (terminal No.1).
NO (lock switch (front door: RH) connector E-06
terminal No.2
− ground.) : Repair the wiring harness
between lock switch (front door: RH) connector E-06
(terminal No.2) and ground.
AC709707 GU
Harness side: E-06
Harness side: C-05
AC209731
Connector E-06
(harness side)
AC208731CH
DIAGNOSIS
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KEYLESS OPERATION SYSTEM (KOS)
42B-222
STEP 5. Check the wiring harness between the lock switch
(front door: RH) connector E-06 (terminal Nos. 1, 2) and the
ground for short circuit.
(1) Disconnect lock switch (front door: RH) connector E-06,
and check the wiring harness.
(2) Check the wiring harness between lock switch (front door:
RH) connector E-06 (terminal No. 1) and ground
OK: No continuity
(3) Check the wiring harness between lock switch (front door:
RH) connector E-06 (terminal No. 2) and ground
OK: No continuity
Q: Is the wiring harness between lock switch (front door:
RH) connector E-06 (terminal Nos. 1, 2) and the ground
in good condition?
YES : Go to Step 6.
NO [lock switch (front door: RH) connector E-06
terminal No.1
− ground.] : Repair the wiring harness
between lock switch (front door: RH) connector E-06
(terminal No.1) and ground.
NO [lock switch (front door: RH) connector E-06
terminal No.2
− ground.] : Repair the wiring harness
between lock switch (front door: RH) connector E-06
(terminal No.2) and the ground.
STEP 6. KOS communication test
Using scan tool (M.U.T-III), perform the antenna communica-
tion test to check that the exterior transmitter antenna (passen-
ger's side) communicates normally (Refer to
Q: Is the check result normal?
YES : Go to Step 7.
NO : Perform troubleshooting for the diagnostic trouble
code No. B240B (Refer to
).
STEP 7. Check of the troubles
Operate the lock switch (front door: RH) to check that the door
can be locked.
Q: Is the check result normal?
YES : The diagnosis is complete.
NO : Replace KOS-ECU and register the ID codes (Refer
to
AC209731
AC208731CO
Harness side: E-06
AC209731
AC208731CP
Harness side: E-06
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