Mitsubishi Evolution X. Manual — part 557

DIAGNOSIS

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KEYLESS OPERATION SYSTEM (KOS)

42B-135

CAUTION

If there is any problem in the CAN bus lines, an incorrect
diagnostic trouble code may be set. Prior to this diagno-
sis, diagnose the CAN bus lines (Refer to GROUP 54C,
Trouble code diagnosis

P.54C-14

DTC SET CONDITION

DTC C1910, C1920, C1930, C1940

• When the reception abnormality warning is activated

because of the low battery voltage of the TPMS transmitter.

DTC C1911, C1921, C1931, C1941

• When KOS-ECU cannot receive the signals from the TPMS

transmitters while driving for about 20 minuites, this code is
set.

TROUBLESHOOTING HINTS

The most likely causes for this DTC to set are:

• Low battery that is incorporated into the TPMS transmitter

• Damaged wiring harness and connector

• Registered IDs unmatched

• Malfunction of Receiver antenna assembly

• Malfunction of TPMS transmitter

• Malfunction of KOS-ECU

DIAGNOSIS

Required Special Tools:

• MB991958 Scan Tool (M.U.T.-III Sub Assembly)

• MB991824: Vehicle Communication Interface (V.C.I.)

• MB991827 M.U.T.-III USB Cable

• MB991910 M.U.T.-III Main Harness A

STEP 1. M.U.T.-III CAN bus diagnostics
Use scan tool to diagnose the CAN bus lines.
Q: Is the check result normal?

YES : Go to Step 3.
NO : Repair the CAN bus lines (Refer to GROUP 54C

−

CAN Bus Diagnostics table

P.54C-240

). On

completion, go to Step 2.

DIAGNOSIS

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KEYLESS OPERATION SYSTEM (KOS)

42B-136

STEP 2. Diagnostic trouble code recheck after resetting
CAN bus lines
Q: Is the DTC C1910, C1920, C1930, C1940, C1911, C1921,

C1931 or C1941 set?
YES (When DTC C1911, C1921, C1931 and C1941 are
set) : Go to Step 3.
YES (When DTC C1911, C1921, C1931 or C1941 is set) :

Go to Step 7.

YES (When DTC C1910, C1920, C1930, C1940, C1911,
C1921, C1931 and C1941 are set) : Replace all TPMS

transmitters, and then register the ID codes. (Refer to

P.42B-265

.) Then go to Step 8.

NO : The procedure is complete.

STEP 3. Connector check: C-05 KOS-ECU connector, C-16
joint connector, C-41 intermediate connector, and D-14
receiver antenna assembly connector
Q: Is the check result normal?

YES : Go to Step 4.
NO : Repair or replace the difective connector, and then

P.42B-265

.) Then go

to Step 8.

DIAGNOSIS

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KEYLESS OPERATION SYSTEM (KOS)

42B-137

STEP 4. Wiring harness check between C-05 KOS-ECU
connector and D-14 receiver antenna assembly connector.
(1) Disconnect C-05 KOS-ECU connector and D-14 receiver

antenna assembly connector.

(2) Measure at the connector side of the D-14 receiver antenna

assembly.

(3) Measure the resistance between the D-14 receiver antenna

assembly terminals.

•

Terminal No.1

− body ground.

•

Terminal No.3

− body ground.

•

Terminal No.5

− body ground.

•

Terminal No.8

− body ground.

AC709322 BY

Harness side: D-14

AC709322 BZ

Harness side: D-14

AC709322 CA

Harness side: D-14

AC709322 CB

Harness side: D-14

DIAGNOSIS

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KEYLESS OPERATION SYSTEM (KOS)

42B-138

•

Terminal No.12

− body ground.

OK: No continuity

Q: Is the check result normal?

YES : Go to Step 5.
NO (terminal No.1